CN101158638A - Nano argentum spectrophotometry for detecting hydroxy free radical - Google Patents
Nano argentum spectrophotometry for detecting hydroxy free radical Download PDFInfo
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Abstract
The invention relates to a nanometer silver spectrophotometer which is provided with the nanometer silver as hydroxyl radical scavenger and is a method that determines the absorbency of tested systems with the spectrophotometer. The hydroxyl radical is tested as follows, (1) rationed nanometer silver is taken to be evenly mixed with tested liquid of known consistency and the tested liquid contains or can produce the hydroxyl radical, and the tested systems are formed after constant volume with water; (2) the tested systems is transferred to a cuvette and absorbance A is determined with the spectrophotometer at 460nm; (3) the nanometer silver as the blank contrast is taken to determine the absorbance A<SUB>0</SUB>; (4) Delta A= A<SUB>0</SUB>-A is determined; (5) a specification curve is made out according to the correspondence of the values of the hydroxyl radical consistency C and delta A of the tested systems of different consistency; (6) the value of delta A of the tested system of unknown consistency is determined according to the steps of (1)-(4), and the hydroxyl radical consistency of the tested system of unknown consistency is calculated according to the specification curve of (5). The invention is of safety, high sensitivity, good stability, and low test cost and the adopted reagent is safe and not noxious.
Description
Technical field:
The present invention relates to the detection method of hydroxyl radical free radical, specifically is as the trapping agent of hydroxyl radical free radical, with method---the nano argentum spectrophotometry of the absorbance of spectrophotometric determination tested systems with Nano Silver.
Background technology:
Hydroxyl radical free radical (OH) is the most active a kind of active oxygen species of present known chemical character, and electron transfer can take place, and captures reactions such as hydrogen atom and hydroxylation, makes carbohydrate, amino acid, protein, nucleic acid and lipid generation oxidation.Because the oxidability of OH is strong, the life-span short, it is big that body is endangered, it is relevant with aging, tumour, radiation damage and cytophagy; In addition, the hydroxy radical clearance rate is the important indicator of reflection medicine antioxidant effect, therefore, in fields such as preclinical medicine, clinical medicine, preventive medicine, pharmacy, free radical has been carried out a large amount of research.
In addition, in known oxygenant, the oxidability of OH is only second to F
2, be a kind of nonselective oxygenant, various organism of oxidation easily and inorganics, the oxidation efficiency height, reaction velocity is fast.Thereby in the research of Atmospheric Chemistry, natural water body chemistry and waste water advanced oxidation etc., relate to the chemical reaction that many free radicals participate in, the conversion of free radical and pollutant and remove closely related.But because free radical is very active, the concentration life-span low, that exist is short, and the method for therefore setting up a kind of sensitive fast measuring OH is particularly important.。
The method of measuring hydroxyl radical free radical at present both at home and abroad mainly contains: electron spin resonance (ESR), high performance liquid chromatography (HPLC), chemoluminescence method (CL), photometry, electrochemical process, fluorescence method etc.Wherein, the ESR method can be directly used in and detect and study free radical and transition metal ion and the compound thereof with unpaired electron, but because the method is to utilize spin agent for capturing and short life combined with radical to generate metastable free radical, promptly spin adduct carries out ESR then and measures.Because the life-span of spin adduct is still very short, has only a few minutes or dozens of minutes, therefore, must carry out EPR mensuration immediately behind the Mulberry Extract, so the preparation and the detection of sample had very big restriction.The HPLC method also is the method for a kind of indirect detection OH commonly used, this method is to select earlier suitable compound to catch free radical in the system, make it to generate and have certain stability, and can be by the product of liquid chromatographic detection, use the HPLC liquid chromatogram measuring then, wherein, it is toxic that dimethyl sulfoxide (DMSO) (DMSO) captures the used DMSO of free radical determination method, can see through skin rapidly and enter in the body; And salicylic acid to capture free radical HPLC determination method be with electrochemical detector determining OH and salicylic product 2,3-dihydroxy-benzoic acid and 2,5-dihydroxy-benzoic acid, its detectability are respectively 10 and 5fmol.HPLC method selectivity is better, can detect several free radicals simultaneously, but used instrument costs an arm and a leg, and is difficult for penetration and promotion.Xu Xiangrong etc. make luminous substrate with yeast, with chemiluminescence determination the OH that produces of Fenton reaction, be used for the mensuration that dye wastewater is handled OH, favorable reproducibility, but agents useful for same is difficult for obtaining, and method precision is relatively poor.Electrochemical methods promptly utilizes ribodesose and Fenton system to produce the OH effect, under acid condition, be that through explanation generation MDA, MDA formaldehyde, ammonia react generate electroactive product 3,5-diacetyl-1, the 4-dihydropyridine, by the generation of the indirectly quantitative hydroxyl radical free radical of electrochemical methods, but the more and used aldehydes reagent of this method reactions steps is detrimental to health.Fluorescence method is that the OH that utilizes the Fenton reaction to produce can be with Ce
3+Be oxidized to Ce
4+, measure Ce
3+Fluorescence intensity change can the indirect determination hydroxy radical generation, this method favorable reproducibility, easy and simple to handle fast.In addition, also have laser inductive fluorescence method, chemical ioni zation mass spectroscopy, chemical enlargement method also to can be used to measure hydroxyl radical free radical, cost an arm and a leg etc. but be difficult for penetration and promotion or instrument.
Existing spectrophotometric method such as Xu Xiangrong etc. are in " hydroxyl radical free radical and application thereof in the chemiluminescence determination Fenton reaction " (environmental science, 1998 19 the 2nd phases of volume) with the OH in the DMSO capture Fenton reaction system, methyl sulfinic acid that produces and fast blue BB salt reaction, the diazo-compounds that generates is through toluene: behind normal butyl alcohol (3: the 1) mixture extraction, carry out colorimetric estimation with spectrophotometric method at the 420nm place, this method is used for studying the generation of hydroxyl radical free radical and removing accurately and reliably, and reappearance is preferably arranged.Merchant's careful grade captures OH in the Fenton reaction system with salicylic acid, 2 of generation, 3-dihydroxy-benzoic acid extracted with diethyl ether is with sodium tungstate and sodium nitrite colour developing, with the absorbance at its 510nm place of spectrophotometric determination, the result shows that absorbance is with salicylic acid concentration, Fe then
2+Concentration and H
2O
2Concentration increase and rise, think that this has embodied the Changing Pattern that OH generates, this method is the adoptable simple and practical method of common laboratory.Also have the cromoci photometry in addition, Jin Ming etc. are at " Phen-Fe
2+Oxidizing process detects H
2O
2/ Fe
2+The hydroxy radical that produces " Phen-Fe in (biological chemistry and biophysics progress were rolled up for the 6th phase in 1996 the 23rd)
2+-H
2O
2The system spectrophotometric method, spectrophotometry OH does not need expensive instrument, and is easy, quick, easily popularize, but the disturbing factor in the mensuration process is more, and accuracy, sensitivity and selectivity have much room for improvement.
Summary of the invention:
The nano argentum spectrophotometry that to the purpose of this invention is to provide a kind of new Nano Silver be the detection hydroxyl radical free radical of trapping agent.This method is simple, highly sensitive, good stability, testing cost are low, and the agents useful for same safety non-toxic.
The present invention realizes detection to hydroxyl radical free radical by following steps:
(1) get quantitative Nano Silver, the measured object mixing with containing of concentration known maybe can produce hydroxyl radical free radical forms tested systems behind the water constant volume;
(2) tested systems is transferred to cuvette, uses spectrophotometer to measure its absorbance A in the 460nm place;
(3) get Nano Silver and make blank, measure absorbance A
0
(4) try to achieve Δ A=A
0-A;
(5) according to the corresponding relation of the concentration C and the Δ A value of hydroxyl radical free radical in the tested systems of variable concentrations, make typical curve;
(6) by the method for above-mentioned (1)～(4), record the Δ A of certain unknown concentration tested systems, calculate the concentration of hydroxyl radical free radical in the unknown concentration tested systems according to the typical curve of (5).
In order to adapt, guarantee and improve the accuracy that detects that the present invention is defined as 0.004～0.04m mol/L with the concentration of Nano Silver in the tested systems with present spectrophotometric sensing range and sensitivity.
The present invention needs behind 5min tested systems to be moved into cuvette and measures absorbance after tested systems forms, can improve the stability of assay method like this, guarantees the reliability and the accuracy of testing result.
Nano Silver is a kind of new function material, exists surface plasma resonance to absorb, and resonance scattering effect has been used for Analysis on Resonance and Scattering Light Spectrum, and has obtained effect preferably.Its application at aspects such as sterilizings has also obtained very big success.The Nano Silver preparation is simple, can utilize microwave high pressure to make the Nano Silver particulate fast, adopts the supercentrifugal process purifying then.
The present invention finds that hydroxyl radical free radical that Fenton reaction produces can oxidation nanometer silver particulate and make it become silver ion, cause the absorbance of system to reduce, set up in view of the above measure hydroxyl radical free radical nano argentum spectrophotometry---with the Nano Silver is the hydroxyl radical free radical trapping agent, adopt the absorbance of spectrophotometric determination system.
Ag+·OH→Ag
++OH
-
Though silver is heavy metal, in the method for the present invention, consumption is few, and the present invention only uses this a kind of reagent of Nano Silver, therefore, can not increase testing cost.The silver stable in properties is not easy to react with other general material, so can avoid various interference in the testing process, show high selectivity, reduce to detect error, guarantee stable and testing result reliable of data, and silver-colored safety non-toxic, environment is not produced yet and pollute.
The present invention finds the oxidation reaction sensitivity of hydroxyl radical free radical to Nano Silver, and is irreversible, speed is fast, thereby makes testing process quick, and the gained result is stable, the favorable reproducibility of method, highly sensitive, and detection limit can reach 0.25 μ mol/L (H
2O
2), exceed existing spectrophotometric method.
Nano argentum spectrophotometry is the same with general spectrophotometric method, and used spectrophotometer is a kind of traditional detecting instrument, and the kind model is a lot, low price, simple to operate, be commonly used, general experimenter can finish the detection to hydroxyl radical free radical in general laboratory.
The present invention is defined as 0.004～0.04m mol/L with the concentration of Nano Silver in the tested systems, makes the numerical value and change of absorbance all can be detected reliably by present spectrophotometer, thereby guarantees and improved detection accuracy.Consider the time factor of oxidation reaction, regulation of the present invention needs to detect after tested systems forms back 5min again, reserves the needed time of oxidation reaction process, and the reaction of wait system stops, in stable condition, such testing result is only reliably, accurately.
According to test of the present invention, the liquid phase Nano Silver only produces a surface plasma body resonant vibration absorption peak at the 460nm place, so the nano argentum spectrophotometry of detection hydroxyl radical free radical of the present invention is chosen 460nm as detecting wavelength, so just guaranteed the farthest reliable of testing result.
In a word, the nano argentum spectrophotometry of detection hydroxyl radical free radical of the present invention, do not use expensive instrument and equipment, do not need miscellaneous reagent, do not need strict testing conditions and environment yet, in very common laboratory, can finish detection by general laboratory technician fast simply, and data stabilization, reliable results, highly sensitive, favorable reproducibility is suitable for measuring hydroxyl radical free radical very much, can be applicable to detect in the anti-oxidant research oxidation of the hydroxyl radical free radical in the isolated experiment system, clean-up effect particularly has important use for the screening antioxidant and is worth.Method of the present invention also can be used for quick simple and sensitive ground and detects ozone concentration and other free radical.
Description of drawings:
Fig. 1 is the typical curve of one embodiment of the present of invention;
Fig. 2 is the abosrption spectrogram of Nano Silver.Wherein:
Curve 1:pH 4.0-0.12mmol/L FeSO
4-0.016mmol/L Ag;
Curve 2:pH4.0-0.12mmol/L FeSO
4-0.016mmol/L Ag-1.25 μ mol/L H
2O
2
Curve 3:pH4.0-0.12mmol/L FeSO
4-0.016mmol/LAg-2.5 μ mol/L H
2O
2
Curve 4:pH4.0-0.12mmol/L FeSO
4-0.016mmol/LAg-5.0 μ mol/L H
2O
2
Embodiment:
Following embodiment has been described under acid condition Fe
2+Catalysis H
2O
2Produce hydroxyl radical free radical, hydroxyl radical free radical has stronger oxidisability, silver nano-particle can be oxidized to silver ion, and absorbance reduces, in view of the above the method for the mensuration hydroxyl radical free radical of Jian Liing.The key reaction formula is as follows,
Fe
2++H
2O
2→Fe
3++OH
-+·OH (1)
Fe
3++H
2O
2→Fe
2++HO
2·+H
+ (2)
(Ag)
n+·OH→Ag
++OH
- (3)
Being described below of the assay method of hydroxyl radical free radical: in the tool plug scale test tube of 5mL, the concentration that adds pH3.0～6.0 HAc-NaAc buffer solution 0.1～1.0mL and 0.2～1.0mL successively is the FeSO of 2.0mmol/L
4Solution and certain amount of H
2O
2Solution (getting the storing solution dilution of demarcating), and then add the Nano Silver particulate that 0.1～1.0mL concentration is 0.20mmol/L, being diluted with water to scale, mixing is transferred to cuvette with solution behind 5～10min, measures the A at its 460nm wavelength place, does not add H
2O
2Solution is done blank, measures its absorbance A
0, try to achieve Δ A=A
0-A makes typical curve with the concentration C that amount of hydrogen peroxide was become that Δ A adds when forming tested systems.By reaction principle as can be known, the concentration of hydroxyl radical free radical is directly proportional with concentration of hydrogen peroxide, for studying conveniently, replaces the concentration of hydroxyl radical free radical here with concentration of hydrogen peroxide.Certainly the consumption of hydrogen peroxide is should be able to total overall reaction complete here, all changes into hydroxyl radical free radical, and hydroxyl radical free radical all is used for the silver oxide nanoparticle again.
Embodiment: preparation H
2O
2Solution: get 30%H
2O
21.0ml thin up becomes 250ml, mixing; Getting this solution, to demarcate its concentration with liquor potassic permanganate be 0.0395mol/L; Face with before getting in right amount, be diluted with water to the H of 54.0 μ mol/L
2O
2Solution.
In the tool plug scale test tube of 5 mL, the concentration that adds 0.10mL pH 4.0 HAc-NaAc buffer solution and 0.30mL successively is the FeSO of 2.0mmol/L
4The H that solution and 46.3 μ L, 92.5 μ L, 185 μ L, 370 μ L, 555 μ L, the above-mentioned concentration that has prepared of 740 μ L are 54.0 μ mol/L
2O
2Solution, and then to add 0.40mL concentration be the Nano Silver particulate of 0.20mmol/L, is diluted with water to scale, mixing, behind the 5min solution is transferred to cuvette, place UV1900PC type spectrophotometer (electronics corporation is ground in the Asia, Shanghai) to measure the A at its 460nm wavelength place, do not add H
2O
2Solution is done blank, measures its absorbance A
0, try to achieve Δ A=A
0-A.Relevant data sees Table one.
Table one
| C H2O2(μmol/L) | 0.5 | 1.0 | 2.0 | 4.0 | 6.0 | 8.0 |
| ΔA | 0.021 | 0.042 | 0.093 | 0.175 | 0.257 | 0.343 |
Draw typical curve such as Fig. 1 by table one.Fig. 1 shows changing value with absorbance along with the increase of concentration of hydrogen peroxide C is linear, and the range of linearity is 0.50～8.0 μ mol/L, and regression equation is Δ A
460nm=0.0424C+0.002, related coefficient is 0.9997, detects to be limited to 0.25 μ mol/L.
Get the above-mentioned H for preparing
2O
2Solution 550 μ l measure A, A by above-mentioned method
0, Δ A, triplicate, result such as table two.
Table two
| A | A 0 | ΔA |
| 0.258 | 0.005 | 0.253 |
| 0.260 | 0.004 | 0.256 |
| 0.259 | 0.004 | 0.255 |
According to the typical curve of Fig. 1, original H in the tested systems as can be known
2O
2Solution is 5.925 μ mol/L, and the concentration mean value of the hydroxyl radical free radical of generation also is 5.925 μ mol/L, the RSD=1.0% of testing result.
Claims (3)
1. detect the nano argentum spectrophotometry of hydroxyl radical free radical, contain following step:
(1) get quantitative Nano Silver, the measured object mixing with containing of concentration known maybe can produce hydroxyl radical free radical forms tested systems behind the water constant volume;
(2) tested systems is transferred to cuvette, uses spectrophotometer to measure its absorbance A in the 460nm place;
(3) get Nano Silver and make blank, measure absorbance A
0
(4) try to achieve Δ A=A
0-A;
(5) according to the corresponding relation of the concentration C and the Δ A value of hydroxyl radical free radical in the tested systems of variable concentrations, make typical curve;
(6) by the method for above-mentioned (1)～(4), record the Δ A of certain unknown concentration tested systems, calculate the concentration of hydroxyl radical free radical in the unknown concentration tested systems according to the typical curve of (5).
2. according to the method for claim 1, the concentration that it is characterized in that Nano Silver in the tested systems is 0.004～0.04mmol/L.
3. according to the method for claim 1 or 2, it is characterized in that tested systems forms after, need behind 5min, to move into cuvette and measure absorbance.
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