CN112557492A - Method for calibrating ICP-MS (inductively coupled plasma-mass spectrometry) trace element analyzer by using internal standard combined solution - Google Patents
Method for calibrating ICP-MS (inductively coupled plasma-mass spectrometry) trace element analyzer by using internal standard combined solution Download PDFInfo
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Abstract
The invention discloses a method for calibrating an ICP-MS (inductively coupled plasma-mass spectrometry) trace element analyzer by using an internal standard combined solution, which comprises the following steps of: prefabricating an internal standard combined solution; simultaneously injecting an internal standard calibrator and an external standard calibrator; adjusting parameters of the trace element analyzer; simultaneously injecting an internal standard calibrator and an external standard calibrator; drawing a calibrated standard working curve; and detecting signals of the trace elements and the internal standard elements in the sample to be detected, calculating the ratio of the trace elements to the internal standard elements, and calculating the concentration of the trace elements to be detected on the basis of the calibrated standard working curve. The preparation work before the on-machine detection is simple and quick in operation, the probability of manual misoperation caused by complicated preparation is reduced, and when the standard working curve is directly adopted for testing, an internal standard method is used for correction to obtain the optimal test result.
Description
Technical Field
The invention belongs to the field of biological detection, and relates to an internal standard calibrator for determining Mn element in human whole blood by using an inductively coupled plasma mass spectrometry, and a method for determining Mn element in human whole blood by using the inductively coupled plasma mass spectrometry.
Background
The elements in the human body can be divided into major elements and trace elements according to the content of the elements in the human body, wherein the major elements are elements which account for more than one ten thousandth of the specific gravity of the human body and comprise calcium (Ca), sodium (Na), phosphorus (P), potassium (K), magnesium (Mg), chlorine (Cl), sulfur (S) and the like, and the trace elements are elements which account for less than one ten thousandth of the total amount of the human body and are required to be taken less than 100Mg daily. In 1995, 10 kinds of trace elements, such as copper (Cu), cobalt (Co), chromium (Cr), iron (Fe), fluorine (F), iodine (I), manganese (Mn), molybdenum (Mo), selenium (Se), and zinc (Zn), were listed as essential trace elements essential for maintaining normal life activities of human bodies by the expert committee of FAO/WHO (Food and agriculture Organization/world health Organization, united nations Food and agriculture Organization/world health Organization).
Manganese is an essential dietary element for the human body. It is a key component of many proteins and enzymes, and participates in multiple biological reactions in the form of coenzymes. In addition to constituting coenzymes, the physiological functions of manganese include: promoting the development and growth of bone; maintain the normal operation of brain function; maintain normal metabolism of sugars and fats; maintain the integrity of the mitochondria of the cells. The human body contains about 12 mg of manganese, mostly in the bones, also commonly found in the liver and kidneys. In the human brain, manganese binds to manganese metalloproteins, a common occurrence is glutamine synthetase in astrocytes. The american medical Institute (IOM) sets an upper limit for daily manganese intake for adults of 11 mg. Manganese deficiency is rare, but excessive manganese intake can lead to manganese poisoning, producing symptoms similar to parkinson's disease.
Calcium is the most abundant metal element and the fifth most abundant element in the human body. The calcium content of human body is about 1-1.25kg, and is 1.5-2% of body weight, and the number of calcium atoms is second to C, H, O, N, and is the most abundant metal in human body. The average amount of calcium per kilogram of non-adipose tissue is about 20-25 g. More than 99% of calcium in vivo is distributed in bones and teeth, and less than 1% of calcium is distributed in body fluid and tissues and organs of the whole body, and is a participant in various physiological activities. Bone calcium is composed primarily of hydroxyapatite crystals, accounting for more than 40% of the bone weight, followed by carbonate, citrate, and small amounts of chloride and fluoride. Bone calcium is extremely important for maintaining the concentration of blood calcium and is called the "reservoir" of calcium in humans. Plasma calcium was 48% in ionic form, 46% bound to protein, 3% in complex form, and 3% not identified. The concentration of the blood calcium is quite stable, the concentration is about 10-11mg/100mL, and no age and sex difference exists. Blood calcium is precisely controlled by parathyroid hormone (PTH), keeping bone calcium and blood calcium in balance. If the blood calcium concentration is low, the bone calcium is used for supplementing; conversely, high blood calcium levels deposit calcium in the bone for storage or are excreted via the kidneys in the urine. Calcium intake in various regions of the world is greatly different, 850mg per day is ingested by developed countries in Europe and America on average, and only 344mg is ingested by people in Africa, Latin America and most developing countries, which are different by more than one time. Insufficient calcium uptake is therefore a serious health issue in developing countries. Calcium ions have a special and important influence on nerve tissues, and if the blood calcium ion concentration is reduced, the nerve tissues can be over excited to cause tetany; on the other hand, hypercalcemia inhibits nerve excitation, causes uremia such as polyuria, edema, headache, dizziness, nocturia, lumbago, eye protection in a short term, and causes renal calculus, premature closure (high arrest) of bones, impaired renal function and renal failure in a long term. Therefore, the development of an internal standard calibrator for measuring calcium in human whole blood and the method for measuring calcium in human whole blood by using the internal standard calibrator are of great significance to human health.
Magnesium is rich in human body and is one of essential elements of human body, and can promote bone and cell formation, catalyze and activate various enzymes in the body, participate in energy metabolism in the body and play a key role in energy transmission and storage. Magnesium has important roles in nerve, muscle and cardiac function, and it plays a key role not only in body metabolism but also in myocardial contraction and conductance, neurochemical transmission, skeletal muscle excitability, and maintenance of normal Ca 2+, K + and Na + concentrations. Magnesium metabolism disorder is closely related to various diseases such as digestive system diseases, kidney diseases, endocrine diseases and the like. Serum magnesium determination thus plays an important role in the prevention, diagnosis and monitoring of treatment of diseases as an important component of clinical biochemistry.
The content of vanadium in human body is very low, and the total amount in human body is less than 1 mg. It is mainly distributed in internal organs, especially liver, kidney, thyroid gland, etc., and has high bone tissue content. The normal requirement of vanadium in humans is 100. mu.g/d. The absorption rate of vanadium in stomach and intestine is only 5%, and the absorption site is mainly in upper digestive tract. In addition, vanadium in the environment can be absorbed into the body through the skin and the lung. About 95% of vanadium in blood is transported in an ionic state (VO2+) bound to transferrin, so vanadium and iron can interact in vivo. Vanadium is involved in the normal development and calcification of bone and teeth and can enhance the resistance of teeth to caries. Vanadium also can promote glycometabolism, stimulate vanadate-dependent NADPH oxidation reaction, enhance lipoprotein lipase activity, accelerate adenylate cyclase activation and amino acid conversion, promote erythrocyte growth, etc. Thus, impaired development of teeth, bone and cartilage can occur in the absence of vanadium. Low phospholipid content in liver, malnutritional edema and thyroid gland metabolic disorder.
Aluminum is an unnecessary trace element for the human body. At low doses, elements that may be essential for human function, but are potentially toxic. At certain levels of aluminum, organisms are likely to tolerate, but in slight excess, the toxicity increases, eventually leading to death. Since aluminum is accumulated as blood aluminum after being ingested by a human body, only 10% to 15% of aluminum is likely to be excreted, and most of aluminum is accumulated in the body. Aluminum can be combined with various essential components of human body such as proteins and enzymes to influence various biochemical reactions in the body, and can damage the brain after being taken for a long time to cause dementia, and diseases such as anemia and osteoporosis can also appear, especially the old, children and pregnant women with weak body resistance can be harmed to cause the child to develop slowly, the old can develop dementia, and the pregnant women can influence the fetal development after being taken. Research proves that the brain tissue has affinity to aluminum element, and excessive aluminum deposition in the brain tissue can cause hypomnesis, mental retardation, dyskinesia and aging promotion of people. Therefore, monitoring the blood aluminum content is of great significance for maintaining human health.
Chromium is widely present in the natural environment, and the average concentration of chromium in the earth's crust can reach 125 mg/kg, mainly in the form of trivalent chromium and hexavalent chromium. Chromium entering the human body is accumulated in human tissues and is slowly metabolized and removed. After entering blood, chromium is mainly combined with globulin, albumin and r-globulin in blood plasma. Hexavalent chromium can also permeate erythrocyte membranes, and 50% of hexavalent chromium can enter cells within 15 minutes and is combined with hemoglobin after entering the erythrocytes. Chromium metabolites are mainly excreted from the kidneys and a small amount is excreted via the feces. Hexavalent chromium is mainly chronic toxic to humans, and it can invade the human body through the digestive tract, respiratory tract, skin and mucous membrane, accumulating in the body mainly in the liver, kidney and endocrine glands. The air entering through the respiratory tract is easily accumulated in the lungs. Hexavalent chromium has a strong oxidizing effect, so chronic poisoning gradually progresses to irrecoverable drugs from local lesions. When invading into human body through respiratory tract, it starts to invade upper respiratory tract, causing rhinitis, pharyngitis, laryngitis and bronchitis.
In view of the important significance of detecting the above 6 trace elements in human body (especially blood samples), there is a need for an accurate and sensitive detection method. At present, Atomic Absorption Spectroscopy (AAS), Atomic Fluorescence Spectroscopy (AFS), inductively coupled plasma emission spectroscopy (ICP-AES), and the like are used as methods for measuring the content of various elements in whole blood. Among them, atomic absorption spectrometry can be classified into graphite furnace atomic absorption spectrometry (GF-AAS), flow injection-cold steam generation atomic absorption spectrometry (FI-VGAAS), and Flame Atomic Absorption Spectrometry (FAAS), depending on the atomization method. The GF-AAS has the advantages of small sampling amount, simple pretreatment, high sensitivity, capability of directly analyzing solid and high-viscosity liquid samples and the like, is suitable for analyzing biological samples, is widely applied to actual element inspection work, has the main defect of serious matrix interference, and can detect only one element at a time, thereby consuming a long time. FAAS is a classical analysis technology, has the advantages of stable signal, relatively small interference, high analysis speed, simple operation and the like, and is mostly adopted in trace element detection. The main disadvantage of this method is that it is not suitable for the determination of refractory elements, alkaline earth elements and elements with resonance absorption lines in the far ultraviolet range, which are not completely decomposed. The FI-VGAAS can be used for detecting elements formed by hydrides or cold steam, such as arsenic, selenium, bismuth, mercury and the like.
Because the analysis period of AAS and AFS is long, only one element can be detected at one time, the efficiency is low, the accuracy and the linear range can not cover all the clinical element concentrations and are easily influenced by organism interference, and the like, the application of the method in clinic is limited; the ICP-AES can simultaneously measure a plurality of elements, is convenient to operate, low in cost and good in stability, is a detection method which is commonly used in clinic, but a corresponding matrix improver is required to be used in the measurement process, the sample pretreatment process is complicated, and the detection limit cannot meet the requirement of measuring the content of the heavy metal elements in blood. Inductively coupled plasma mass spectrometry (ICP-MS) is an inorganic element and isotope analysis testing technology developed in the 80 th 20 th century, and a high-sensitivity analysis technology is formed by combining the high-temperature ionization characteristic of inductively coupled plasma with the advantage of sensitive and rapid scanning of a mass spectrometer through a unique interface technology. The ICP-MS method for detecting the trace elements in the human body has the characteristics of high sensitivity, wide linear range, capability of simultaneously detecting multiple elements, small sample consumption and the like, is suitable for measuring mass samples, and is widely used in the fields of earth science, environmental analysis, food science, petroleum industry, metallurgical analysis and the like.
Researches find that the internal standard calibrator plays a crucial role in the accuracy of detection results in the detection of trace elements in human bodies. Calibrators, i.e. calibrators, are standard substances whose values are used as arguments in a calibration function for calibrating a measurement system or assigning values to a material; the correct property control substance is a standard substance for evaluating the measurement deviation of a measurement system.
Chinese patent application "a serum calcium standard substance" (patent application No. 200910237607.0) discloses a serum calcium standard substance, which is prepared by the following method: diluting the in vitro serum or adding calcium to obtain 5 serum solutions with different calcium concentrations, and then respectively carrying out value determination on each serum solution in the 5 serum solutions with different calcium concentrations to obtain 5 serum calcium standard substances with calcium concentrations. Good intercommunity and uniformity, and good stability at-80 deg.C. However, the serum calcium standard substance disclosed by the invention takes the isolated serum as a matrix, is formed by mixing the isolated sera from different individuals, and has the disadvantages of high configuration difficulty and relatively complex operation. Therefore, there is a need for a human trace element detection internal standard calibrator, which can improve the accuracy and stability of trace element detection in human blood, improve detection precision, shorten detection time, and reduce detection cost.
The Chinese patent application 'method for determining trace elements in human whole blood by inductively coupled plasma mass spectrometry' (application number: 201610197111.5) provides a method for determining trace elements in human whole blood by inductively coupled plasma mass spectrometry. The internal standard elements used In the method are 7 internal standard elements such as scandium (Sc), germanium (Ge), yttrium (Y), rhodium (Rh), indium (In), terbium (Tb) and bismuth (Bi), and the internal standard working solution is prepared by diluting nitric acid with volume fraction of 0.2% as diluent, and the concentration is 20-100 mug/L. Although the method can complete the detection of various trace elements to a certain extent, 7 internal standard elements need to be configured, the process is complicated, and expensive internal standard products are consumed.
The Chinese patent application 'determination of content of trace metals in biological tissues and body fluids' (application number: 201810749441x) provides a method for determining trace elements in body fluids by inductively coupled plasma mass spectrometry. The method uses 5 internal standard elements such as scandium (Sc), germanium (Ge), yttrium (Y), indium (In), terbium (Tb) and the like, and the internal standard working solution is prepared by diluting nitric acid with volume fraction of 1% as diluent, and the concentration is 1-30000 mu g/L. Although the method only needs to configure 5 internal standard elements, the method still has the defects of complex process and high cost of internal standard products.
The inventor's prior Chinese patent application ' an ICPMS detection kit for detecting 20 elements in serum ' (application number: 2016110405291) discloses a method for detecting 20 elements in serum and a matched kit, wherein the kit is mainly used for sample pretreatment and quality control required when an inductively coupled plasma mass spectrometer (ICP-MS) is used for detecting the content of the 20 elements in the serum, and comprises diluent, a standard solution containing 20 trace elements, a quality control product and internal standard stock solution. The internal standard elements used In the method are 4 internal standard elements such as germanium 72Ge, indium 115In, lutetium 175Lu, rhodium 103Rh and the like, and the internal standard working solution is prepared by diluting nitric acid with the volume fraction of 2% as diluent, and the concentration is 100 mug/L. Although the method only needs to be provided with 4 internal standard elements, the defect of excessive and expensive internal standard products is still consumed, and meanwhile, in order to overcome the defect of sensitivity reduction caused by less internal standard elements, the invention needs to draw a complex 7-point standard curve, prepare 7 tubes of independent standard solution stock solutions respectively, and then prepare mixed winning solutions respectively or in combination, so that the preparation process is excessively complicated, and the inconvenience is brought to use.
The inventor's prior Chinese patent application ' a kit for measuring trace elements in human urine ' (application number: 2016110348477) discloses a method for measuring trace elements in human urine and a matched kit, comprising diluent, standard solution containing 21 trace elements, a quality control product, internal standard stock solution and the like, comprising diluent, standard solution containing 21 trace elements, a quality control product and internal standard stock solution. The internal standard elements used In the method are 3 internal standard elements such as germanium 72Ge, indium 115In, rhodium 103Rh and the like. Although the method further only needs to prepare 3 internal standard elements, the defect of consuming too much expensive internal standard products is still overcome, and meanwhile, in order to overcome the defect of sensitivity reduction caused by less internal standard elements, the invention needs to draw a complex 7-point standard curve, prepare 7 tubes of independent standard solution stock solutions respectively, and then prepare mixed winning solutions respectively or in combination, so that the preparation process is too complicated, and the use is inconvenient.
In addition, for the selection of internal standard samples and quantity, the ICP-MS considers that the elements with the mass number and the ionization energy similar to those of the elements to be detected are preferentially selected as the internal standard by Tianmei and the like (ICP-MS measurement environment uranium non-mass spectrum interference internal standard correction research [ J ]. analytical laboratory, 2012, 31(8): 116-120). According to the requirements of inductively coupled plasma mass spectrometry (HJ 657-2013) for measuring metal elements such as lead in air and exhaust gas particles and inductively coupled plasma mass spectrometry (HJ 700-2014) for measuring 65 elements in water, the internal standard element is selected according to the mass size of the isotope of the element to be measured, the internal standard elements which can be used within the range of +/-50 amu of the mass number of the isotope are generally selected, and 65 internal standard substances of the element are recommended. However, when the same internal standard system is used for detecting a plurality of trace elements, various elements with the mass number and ionization energy similar to those of the elements to be detected are required to be used as the internal standards, so that the quantity of the currently available internal standard combinations is too large, and the use is inconvenient. However, if only a small number of internal standard (for example, 1-2 kinds) is used, although the cost can be reduced and the use is convenient, because necessary internal standard elements with similar mass numbers of elements to be detected are lacked, the defect of sensitivity reduction exists, and the application of ICP-MS for detecting trace elements in blood is influenced.
Based on the above studies, there is a need for a detection technique that can use a smaller number of combinations of internal standard products while maintaining sensitivity to detect trace elements of 6 or even more different mass sizes.
Disclosure of Invention
One of the principles of the present invention is to select a simple combination of elements only including scandium (Sc) and germanium (Ge) based on a large number of combinations of internal standard products including scandium (Sc), germanium (Ge), yttrium (Y), indium (In), terbium (Tb), lutetium (Lu), rhodium (Rh), terbium (Tb), bismuth (Bi), etc., and to use the combination as an internal standard calibration product for 6 kinds of trace elements.
The second principle of the invention is that, in a sample solvent suitable for a mass spectrometry matrix solution or an organic solvent (for example, acetonitrile, methanol, ethanol, isopropanol, dichloromethane and the like) used for cleaning an instrument, isopropanol with a certain content ratio is used as a matrix solvent, and compared with the matrix solvent without isopropanol or other solvents (for example, methanol, n-butanol, acetonitrile and the like), the prepared internal standard solution can effectively overcome the adverse effect of the matrix effect, thereby enhancing the signal detection intensity of the trace element to be detected. Therefore, the isopropanol with a specific proportion is selected as the matrix solution of the internal standard product, so that the detection sensitivity of simple element combination of scandium (Sc) and germanium (Ge) can be effectively improved. Furthermore, the invention also tests that methanol, n-butanol, acetonitrile and isopropanol with different proportions are mixed, and the optimal mixing proportion is preferably selected to prepare the matrix solution of the internal standard product.
The third principle of the invention is that other components (nitric acid and triton) and content ratios thereof of the matrix solution are further adjusted and optimized on the basis of the above, so as to obtain an optimized internal standard calibrator system for detecting 6 or even more trace elements.
The fourth principle of the invention is that a detection system is obtained on the basis, five elements of fe, co, ni, cu and zn are further tested, and the detection system has a good detection effect.
Based on the above inventive principle, one of the objects of the present invention is to provide an internal standard combined solution for detecting six trace elements in human whole blood by ICP-MS, characterized in that the internal standard combined solution comprises internal standard elements of scandium (Sc), germanium (Ge) and a base solution, and the concentration of the internal standard elements in the base solution is 10-60 μ g/L, preferably 20-50 μ g/L, and more preferably 30-40 μ g/L.
In one embodiment, the base solution comprises 0.1% to 0.5% (V/V) nitric acid, 0.1% to 0.5% (V/V) triton, and 1.5% to 3% (V/V) organic solvent for sensitivity improvement.
In any one of the above embodiments, wherein the organic solvent is isopropanol, the content thereof in the matrix solution is 2% (V/V).
In any of the above embodiments, wherein the organic solvent is isopropanol, methanol, n-butanol, acetonitrile, etc., in a ratio of 4: 2: 1: 0.5. in a preferred embodiment, the organic agent is present in the matrix solution in an amount of 2% (V/V).
In any of the above embodiments, the internal standard combination solution is prepared by the steps of:
(1) sequentially adding 3 components of nitric acid, triton and isopropanol of the matrix solution into a dry sterile vessel, and uniformly mixing at room temperature;
(2) adding an internal standard element into the base solution obtained in the step (1) to ensure that the concentration of the internal standard element is 40 mu g/L.
In a preferred embodiment, the germanium is the national standard of national Standard research center, numbered GSB04-1728-2004, and the scandium is the national standard of national Standard research center, numbered GSB 04-1750-2004.
The second object of the present invention is to provide a method for calibrating an ICP-MS trace element analyzer using the internal standard composition solution, comprising the steps of:
(1) and (4) placing the internal standard combined solution to room temperature, and fully shaking the internal standard combined solution for standby.
(2) During detection, simultaneously injecting an internal standard calibrator and an external standard calibrator (or a quality control material or an unknown sample);
(3) adjusting each parameter of a trace element analyzer (Clin-ICP-QMS-I) to an optimal state according to the instrument operation rules;
(4) after the instrument is stabilized, simultaneously injecting an internal standard calibrator and an external standard calibrator, sequentially injecting the external standard calibrator from No. 0 to No. 5, wherein 1mL of the internal standard calibrator needs to be consumed for each sample detection, each sample is detected for 3 times, and the average value is taken;
(5) taking the ratio of the signal of the element to be measured in the external standard calibrator to the signal of the element of the corresponding internal standard calibrator as a vertical coordinate, taking the concentration of the element to be measured in the external standard calibrator as a horizontal coordinate, and drawing a calibrated standard working curve;
(6) and detecting signals of the trace elements and the internal standard elements in the sample to be detected, calculating the ratio of the trace elements to the internal standard elements, and calculating the concentration of the trace elements to be detected on the basis of the calibrated standard working curve.
In one embodiment, the trace element analyzer is a Clin-ICP-QMS-I analyzer, which was developed by the inventors.
In another embodiment, in the step (6), the concentration of the trace element to be measured is calculated by software.
The third purpose of the invention is to provide a method for detecting six elements in human whole blood by using an ICP-MS microelement analyzer, which comprises the following steps:
(1) collecting a blood sample;
(2) sample pretreatment: diluting the blood sample by 20 times in the diluent, and then shaking and mixing uniformly;
(3) adding a quality control product for quality control:
low concentration quality control product: the low-quality control product is placed at room temperature for 5-10 minutes to be balanced, 3mL of purified water is accurately measured and added, the mixture is subjected to ultrasonic treatment in an ultrasonic cleaning instrument for 4-5 minutes until the mixture is fully dissolved, 100 mu L of quality control sample is taken and put into a centrifuge tube filled with 1.9mL of diluent, 20 mu L of blood sample is taken and transferred into the centrifuge tube filled with 9.98mL of diluent by using a checked liquid transfer gun, the mixture is placed on a vortex oscillator to be fully and uniformly mixed, and the mixture is ready to be tested on a machine;
high concentration quality control product: and (3) placing the high-quality control product in advance at room temperature to be balanced and fully melted, taking 100 mu L of quality control sample into a centrifuge tube filled with 1.9mL of diluent, using a verified pipette to transfer 20 mu L of blood sample into the centrifuge tube filled with 9.98mL of diluent, placing the centrifuge tube on a vortex oscillator to be fully mixed, and waiting for detection on a computer.
(4) Detection on machine
Sequentially introducing a blank reagent, a calibration solution, a quality control blood sample and a sample solution into an instrument for measurement, adding an internal standard solution on line, and injecting the sample solution and the internal standard solution in a ratio of 1: 1; when the correlation coefficient of each element calibration curve is more than 0.999, the quality control blood sample can be detected; when the error of the quality control blood sample detection result is within +/-20%, the sample solution can be continuously detected.
(5) Result processing
Drawing a calibration curve y ═ ax + b according to the ratio of the element signal to be detected and the internal standard signal in the mixed element standard solution and the concentration of the element to be detected in the mixed element standard solution, calculating the mass concentration (mu g/L) of the content of each element to be detected in the detected sample according to a regression equation,
the computational regression equation of the concentration of trace elements in whole blood is as follows:
ρ(X)＝c·K…………………………(1)
in the formula:
rho (X) -the mass concentration of trace elements in whole blood in micrograms per liter (. mu.g/L);
c-the mass concentration of trace elements in whole blood, measured by a standard curve, in micrograms per liter (. mu.g/L);
k-whole blood dilution factor.
Technical effects
1. The preparation work before the on-machine detection is simple and rapid to operate (<20min), and the probability of human misoperation caused by complicated preparation is reduced.
2. Free ions/elements, ion/element complexes, and total element amounts can be detected using ICP-MS detection methods. The detected elements are various (283 types), and the sensitivity is high (<0.001-10 mug/L).
3. When the standard working curve is directly adopted for testing, the best test result can be obtained by using an internal standard method for correction.
4. The purpose of adding the internal standard elements is to compensate the long-term drift of the instrument in the analysis process, and the proper internal standard elements are selected, so that the measurement stability can be improved by one order of magnitude, and the final result is expressed in the overall precision of the quantitative result.
5. And the detection cost is reduced by using the independently developed trace element analyzer and under the condition of keeping the advantages of all ICP-MS detection methods.
Principles and definitions
The principle of the invention is that an inductively coupled plasma source of a mass spectrum system is excited by high-energy radio frequency energy to form plasma, and an external standard calibrator containing an element to be detected enters a high-vacuum quadrupole fast scanning mass spectrum detection part through a cone interface and an ion transmission system in sequence through the processes of evaporation, dissociation, atomization, ionization and the like under the action of high-temperature plasma to form univalent positive ions. And (3) drawing a standard curve in software according to the ratio of the to-be-detected element signal and the internal standard signal in the mixed element external standard calibrator and the concentration of the to-be-detected element in the mixed element external standard calibrator, so as to calibrate the instrument.
The term "standard substance", i.e. a standard substance/standard sample, is a material or substance, one or more characteristic values of which are sufficiently uniform and stable and well defined for calibrating a measuring system, evaluating a measuring procedure or assigning a value to a material.
The term "calibrator" means: calibrators, which are standard substances whose values are used as arguments in a calibration function for calibrating a measurement system or assigning values to a material; the correct property control substance is a standard substance for evaluating the measurement deviation of a measurement system.
The standard substance has two main functions of calibrating and evaluating the measuring system. A standard substance can be used as both a calibration substance and a correct property control substance in one measurement procedure or measurement system, but not as both a calibration substance and a correct property control substance. In general, reference substances are higher-order reference substances, most of which are certified reference substances. Certified standard substances are certified standard substances, one or more characteristic values of which are determined by a traceability-establishing procedure so as to be traceable to an accurately reproduced measurement slip representing the characteristic value, each determined characteristic value having an uncertainty of a given confidence level. It can be seen that the difference between the certified standard substance and the standard substance is that the former has clear traceability and uncertainty requirements. The standard substance standard sample producer capacity approval criteria which are officially released and implemented in China at 8.1.2007 put higher requirements on the organization production management of standard substance producers, standard substance assignment and statistical methods, uncertainty evaluation, performance indexes which the standard substances need to reach, and the like.
Matrix effect: the detection result is usually corrected by using a standard curve prepared from a matrix solution or a standard solution with a certain concentration prepared from the matrix solution. However, in practical tests, even different samples of the same matrix can produce different matrix effects, sometimes even the opposite, especially for detecting trace elements with low molecular weight and high molecular weight in biological samples (refer to 4: rapid determination of various heavy metal elements in human blood and urine by dilution method). Therefore, more effective methods are to try to use effective purification methods, such as SPE, liquid-liquid extraction, GPC, refrigerated centrifugation.
Drawings
FIG. 1: the standard curve for elemental manganese in whole blood tested by the invention in example 2.
FIG. 2: in the control example, a standard curve for detecting the content of manganese element in whole blood without internal standard is used.
FIG. 3: standard graphs of whole blood manganese were detected by a single internal standard in the control example.
Detailed Description
Materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
The instruments, reagents, etc. used in the following examples are as follows:
the instrument comprises the following steps: Clin-ICP-QMS-I trace element analyzer (Beijing Yixinbo Biotech limited); analytical balance (sensory: 0.0001 g); the blood mixer swings for 20-80 times/minute and rolls for 20-80 revolutions/minute; a liquid transfer gun (20-200 muL; 100-1000 muL); and (4) a vortex mixer.
Reagent: nitric acid; purified water (self-made in the laboratory); the whole blood manganese content calibration method comprises the steps of whole blood sample diluent, a whole blood manganese element external standard calibrator, a whole blood manganese element internal standard calibrator and a whole blood manganese element quality control product.
Nitric acid (b)
Not less than 65%, analytical grade, Merck)
Purified water (not less than 18.2M omega cm)
Triton, reagent grade, AlfaeSa (China) chemical Co., Ltd
Isopropanol, chromatographically pure, Saimer Feishale science (China) Co., Ltd
Germanium Ge and scandium Sc single element standard solution, national nonferrous metal and electronic material analysis and test center
The first embodiment is as follows: preparation of human whole blood manganese internal standard calibrator
(1)1％HNO3: measuring 5mL of HNO3Adding purified water into a volumetric flask with the constant volume of 500mL, and uniformly mixing;
(2) preparing a sample diluent: measuring 0.5mL of HNO30.5mL of triton and 10mL of isopropanol are added into a volumetric flask with constant volume of 500mL by using purified water and are mixed uniformly;
(3) preparing a human body whole blood manganese element internal standard calibrator: diluting the germanium Ge and scandium Sc single element standard solution by 100 times with 1% HNO3, wherein the total volume is 10mL, and the concentration is 10mg/L, so as to obtain a human whole blood manganese element internal standard stock solution; and then 0.4mL of human whole blood manganese internal standard stock solution is diluted by 100 times by using the sample diluent, the total volume is 100mL, and the concentration is 40 mug/L, so that the human whole blood manganese internal standard calibrator is obtained. All solutions were prepared by volume dilution.
Example two: calibration of trace element analyzer using internal standard calibrator
Purpose of the experiment: and correcting and optimizing the repeatability and stability of the system by using an internal standard calibrator for a trace element analyzer (Clin-ICP-QMS-I).
The experimental method comprises the following steps:
(1) and (4) placing the internal standard calibrator to room temperature (10-30 ℃), and fully shaking uniformly for later use.
(2) During detection, the internal standard calibrator and the external standard calibrator (or a quality control product or an unknown sample) are simultaneously injected.
(3) According to the operating rules of the instrument, the parameters of the trace element analyzer (Clin-ICP-QMS-I) are adjusted to the optimal state. After the instrument is stabilized, simultaneously injecting an internal standard calibrator and an external standard calibrator, sequentially injecting the external standard calibrator from No. 0 to No. 5, consuming 1mL of the internal standard calibrator for each sample detection, detecting each sample for 3 times, and taking a mean value. And drawing a working curve in the software according to the condition that the ratio of the signal of the element to be detected in the external standard calibrator to the signal of the element of the corresponding internal standard calibrator is a vertical coordinate, and the concentration of the element to be detected in the external standard calibrator is a horizontal coordinate. And automatically calculating the corresponding concentration of other unknown samples by software according to the ratio of the signal of the element to be detected in the sample to the element signal of the corresponding internal standard calibrator.
The experimental results are as follows: according to the above method, a standard curve as shown in FIG. 1 can be obtained.
Example three: detection of manganese content in 116 human whole blood samples
The experimental method comprises the following steps:
1. sample collection and preservation
(1) When a blood collector collects blood, the blood collector does not wear latex gloves as much as possible, and can use plastic gloves or clean the blood collector without wearing a glove handle; thoroughly cleaning skin at venipuncture site during blood collection, and sequentially cleaning skin at blood collection area with iodine tincture and alcohol (iodine tincture is wiped off); (2) the heparin sodium anticoagulation blood collection tube is used for collecting about 2mL of whole blood, the cover is tightly covered, and the whole blood is immediately and gently turned upside down and uniformly mixed to avoid blood coagulation. If the sample cannot be timely checked within 2 hours, the sample is stored at the temperature of 2-8 ℃ for no more than 14 days at most.
2. Sample pretreatment
Diluting by 20 times: and (3) uniformly mixing the whole blood sample (more than 200 mu L) for 5-8 minutes by a blood mixer, transferring 100 mu L of blood sample into a centrifuge tube filled with 1.9mL of diluent by using a verified pipette, fully mixing the blood sample on a vortex oscillator, and waiting for machine detection.
3. Quality control
Low concentration quality control product: the low-quality control product is placed at room temperature for 5-10 minutes to be balanced, 3mL of purified water is accurately measured and added, the mixture is subjected to ultrasonic treatment in an ultrasonic cleaning instrument for 4-5 minutes until the mixture is fully dissolved, 100 mu L of quality control sample is taken and put into a centrifuge tube filled with 1.9mL of diluent, 20 mu L of blood sample is taken and transferred into the centrifuge tube filled with 9.98mL of diluent by using a checked liquid transfer gun, the mixture is placed on a vortex oscillator to be fully and uniformly mixed, and the mixture is ready to be tested on a machine;
high concentration quality control product: and (3) placing the high-quality control product in advance at room temperature to be balanced and fully melted, taking 100 mu L of quality control sample into a centrifuge tube filled with 1.9mL of diluent, using a verified pipette to transfer 20 mu L of blood sample into the centrifuge tube filled with 9.98mL of diluent, placing the centrifuge tube on a vortex oscillator to be fully mixed, and waiting for detection on a computer.
4. Detection on machine
And adjusting the instrument to the optimal state according to the instrument use instruction. Introducing a reagent blank, a calibration solution, a quality control blood sample and a sample solution into an instrument for measurement in sequence, adding an internal standard solution on line, and injecting the sample solution and the internal standard solution in a ratio of 1: 1; when the correlation coefficient of each element calibration curve is more than 0.999, the quality control blood sample can be detected; when the error of the quality control blood sample detection result is within +/-20%, the sample solution can be continuously detected.
5. Result processing
And drawing a calibration curve y ═ ax + b according to the ratio of the element signal to be detected and the internal standard signal in the mixed element standard solution and the concentration of the element to be detected in the mixed element standard solution, and calculating the mass concentration (mu g/L) of the content of each element to be detected in the detected sample according to a regression equation.
Example (c):
the calculation of the mass concentration of manganese in whole blood is shown in formula (1):
ρ(Mn)＝c·K…………………………(1)
in the formula:
rho (Mn) -the mass concentration of manganese (Mn) in whole blood in micrograms per liter (. mu.g/L);
c-the mass concentration of manganese in whole blood, measured in micrograms per liter (. mu.g/L), from a standard curve;
k-whole blood dilution factor.
In a specific embodiment, the sample diluent used is composed of: nitric acid, triton, isopropanol and purified water.
6. The experimental results are as follows:
TABLE 1 results of Mn element detection in whole blood
TABLE 2 anticipated bias at the level of medical decision and its confidence interval (95% CI)
The data from table 1 were subjected to outlier testing and regression analysis, with no outliers and a regression coefficient r of 0.993. The expected bias at the medical decision level and the 95% confidence interval (95% CI) analysis of the data in the table 1 are carried out, the results are shown in the table 2, and the detected Mn element 95% CI does not exceed the limit value of 1/2 allowable error, so that the Clin-ICP-QMS-I system is judged to be effective in detection and equivalent to the control iCAPQ system, but the price of the domestic instruments used by the Clin-ICP-QMS-I system is lower than that of the imported Instruments (iCAPQ), the operating cost of hospitals and inspection institutions is greatly reduced, and the economic burden of patients is reduced.
Comparative example
Detecting the content of manganese element in whole blood under the condition of no internal standard
The experimental method comprises the following steps:
(1) and (4) taking the solution without the added Ge and Sc single elements (the rest components are the same as the internal standard solution) as a reference internal standard calibrator for standby.
(2) During detection, the reference internal standard calibrator and the external standard calibrator (or the quality control product or the unknown sample) are injected simultaneously.
(3) According to the operating rules of the instrument, the parameters of the trace element analyzer (Clin-ICP-QMS-I) are adjusted to the optimal state. After the instrument is stabilized, the reference internal standard calibrator and the external standard calibrator are subjected to sample injection simultaneously, the external standard calibrator is subjected to sample injection sequentially in sequence (from No. 0 to No. 5), 1mL of the reference internal standard calibrator needs to be consumed for each sample detection, each sample is detected for 3 times, and the average value is taken. And drawing a working curve in the software according to the condition that the ratio of the signal of the element to be detected in the external standard calibrator to the signal of the element of the reference internal standard calibrator is a vertical coordinate, and the concentration of the element to be detected in the external standard calibrator is a horizontal coordinate. And automatically calculating the corresponding concentration of other unknown samples by software according to the ratio of the signal of the element to be detected in the sample to the signal of the element of the reference internal standard calibrator.
The experimental results are as follows: according to the above method, a standard curve as shown in FIG. 2 can be obtained.
As shown in fig. 2, in the absence of the internal standard element, the relative deviation of manganese at most points was larger than that corrected with the internal standard scandium Sc.
(II) detecting the content of manganese element in whole blood by using internal standard element yttrium (Y)
The experimental method comprises the following steps:
(1) and (3) preparing an internal standard calibration product by using the element yttrium Y to replace the elements germanium Ge and scandium Sc, and placing the internal standard calibration product to room temperature (10-30 ℃) to be fully shaken up for later use.
(2) During detection, the internal standard calibrator and the external standard calibrator (or a quality control product or an unknown sample) are simultaneously injected.
(3) According to the operating rules of the instrument, the parameters of the trace element analyzer (Clin-ICP-QMS-I) are adjusted to the optimal state. After the instrument is stabilized, simultaneously injecting an internal standard calibrator and an external standard calibrator, sequentially injecting the external standard calibrator from No. 0 to No. 5, consuming 1mL of the internal standard calibrator for each sample detection, detecting each sample for 3 times, and taking a mean value. And drawing a working curve in the software according to the condition that the ratio of the signal of the element to be detected in the external standard calibrator to the signal of the element of the corresponding internal standard calibrator is a vertical coordinate, and the concentration of the element to be detected in the external standard calibrator is a horizontal coordinate. And automatically calculating the corresponding concentration of other unknown samples by software according to the ratio of the signal of the element to be detected in the sample to the element signal of the corresponding internal standard calibrator.
The experimental results are as follows: according to the above method, a standard curve as shown in FIG. 3 can be obtained.
As shown in fig. 3, the relative deviation of manganese at most points was larger with the yttrium Y internal standard than with the internal standard scandium Sc corrected.
Claims (10)
1. A method of calibrating an ICP-MS trace element analyzer using an internal standard combination solution of scandium (Sc) and germanium (Ge), comprising the steps of:
(1) placing the internal standard combined solution to room temperature, and fully shaking the internal standard combined solution for later use;
(2) during detection, simultaneously injecting an internal standard calibrator and an external standard calibrator (or a quality control material or an unknown sample);
(3) adjusting each parameter of a trace element analyzer (Clin-ICP-QMS-I) to an optimal state according to the instrument operation rules;
(4) after the instrument is stabilized, simultaneously injecting an internal standard calibrator and an external standard calibrator, sequentially injecting the external standard calibrator from No. 0 to No. 5, wherein 1mL of the internal standard calibrator needs to be consumed for each sample detection, each sample is detected for 3 times, and the average value is taken;
(5) taking the ratio of the signal of the element to be measured in the external standard calibrator to the signal of the element of the corresponding internal standard calibrator as a vertical coordinate, taking the concentration of the element to be measured in the external standard calibrator as a horizontal coordinate, and drawing a calibrated standard working curve;
(6) and detecting signals of the trace elements and the internal standard elements in the sample to be detected, calculating the ratio of the trace elements to the internal standard elements, and calculating the concentration of the trace elements to be detected on the basis of the calibrated standard working curve.
2. The method of claim 1, wherein the internal standard composite solution comprises only internal standard elements scandium (Sc), germanium (Ge) and a base solution, the internal standard elements having a concentration of 10-60 μ g/L in the base solution.
3. The method of claim 2, wherein the concentration of the internal standard element in the matrix solution is 20-50 μ g/L.
4. The method of claim 3, wherein the concentration of the internal standard element in the matrix solution is 30-40 μ g/L.
5. The method of any one of claims 1 to 4, wherein the matrix solution comprises 0.1% to 0.5% (V/V) nitric acid, 0.1% to 0.5% (V/V) triton, and 1.5% to 3% (V/V) organic solvent for sensitivity enhancement.
6. The method of claim 5, wherein the organic solvent is isopropanol, which is present in the matrix solution in an amount of 2% (V/V).
7. The method of claim 6, wherein the organic solvent is isopropanol, methanol, n-butanol, acetonitrile, etc., in a ratio of 4: 2: 1: 0.5.
8. the method of claim 7, wherein the organic agent is present in the matrix solution in an amount of 2% (V/V).
9. The method of claim 8 wherein said trace element analyzer is a Clin-ICP-QMS-I analyzer developed by the inventor.
10. The method according to claim 9, wherein in the step (6), the concentration of the trace element to be measured is calculated by software.
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