CN114438255A - Probe primer and fluorescent quantitative PCR detection method and application thereof for specificity detection of Fritillaria pallidiflora - Google Patents
Probe primer and fluorescent quantitative PCR detection method and application thereof for specificity detection of Fritillaria pallidiflora Download PDFInfo
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Abstract
The invention provides a probe primer and a fluorescent quantitative PCR detection method and application thereof for specificity detection of Fritillaria pallidiflora. The probe primer consists of SEQ ID NO: 22-27. The detection method can effectively detect the Fritillaria pallidiflora, has strong specificity and high sensitivity, can be used for qualitative or quantitative detection of whether Fritillaria pallidiflora exists in medicinal materials, decoction pieces or prescription preparations, and has important practical value and application prospect.
Description
Technical Field
The invention belongs to the technical field of medicines, relates to a medicine identification and detection method, and particularly relates to a probe primer, a fluorescence quantitative PCR detection method for detecting specificity of Fritillaria pallidiflora and application of the probe primer.
Background
Fritillary medicinal materials are common bulk medicinal materials and have the effects of relieving cough and reducing sputum, wherein the fritillary bulbs, the Yili fritillary and the fritillary are all recorded in the pharmacopoeia of the people's republic of China (abbreviated as Chinese pharmacopoeia), the fritillary bulbs are traditionally considered to have the best effect, mainly wild, and have the first price in various fritillary medicinal materials; the Fritillaria pallidiflora and Fritillaria planisporus are used as planting products, and have high yield and low price. The basic source of Fritillaria cirrhosa from the chinese pharmacopoeia includes 6 species of liliaceous plants, namely, Fritillaria cirrhosa d.don, Fritillaria unibracteata Hsiao et k.c.hsia, Fritillaria kansuensis f.przewalski maxim, Fritillaria fusiformis f.delayi franch, Fritillaria taipaiensis f.taipaiensis p.y.li or Fritillaria obovata f.unibracteata Hsiao et k.c.ia hsvar.wabuensis (s.y.tang et s.c.yue) z.d.liu, s.wang et s.c.n, which can be classified into pine shell, green shell, furnace shell and cultivated products according to the differences in properties.
The market demand of the bulbus fritillariae cirrhosae is large, but wild resources are limited, and counterfeits are frequently fresh. Common counterfeit products mainly include Fritillaria pallidiflora and Fritillaria paniculata. The adulteration phenomenon of the fritillaria cirrhosa seriously disturbs the market order of fair competition, influences the safety and effectiveness of medication and finally infringes the economic and health benefits of consumers.
Disclosure of Invention
The invention provides a probe primer and a fluorescent quantitative PCR detection method and application thereof for specificity detection of Fritillaria pallidiflora. The detection method can effectively detect the Fritillaria pallidiflora, has strong specificity and high sensitivity, can be used for qualitative or quantitative detection of whether Fritillaria pallidiflora is mixed in medicinal materials, decoction pieces or prescription preparations, and has important practical value and application prospect.
In one aspect, the invention provides a probe primer. The probe primer consists of SEQ ID NO: 22-27.
On the other hand, the invention provides a fluorescence quantitative PCR detection method for detecting specificity of Fritillaria pallidiflora. The method comprises the following steps:
weighing a fritillaria sample and pretreating the sample;
extracting DNA from the sample and preparing a DNA template; and
selecting a probe primer;
optimizing reaction conditions;
setting different judgment bases according to different detection requirements; wherein for qualitative detection, the threshold is determined based on a set CT value (e.g., CT)<35) Judging whether the detection is carried out; for semi-quantitative detection, the absolute value of the difference between the CT value and the positive control is used as a judgment basis, and the smaller the difference is, the higher the content is; for quantitative detection, on one hand, a standard substance (S) is simultaneously set, and on the other hand, double-probe labeling in the same system is adopted for amplification, namely a target probe (P) and an internal reference probe (C) are included; the quantitative detection ratio of the target probe (P) and the internal reference probe (C) in the sample can be expressed as Δ CT (t), and the corresponding standard can be expressed as Δ CT(s), Δ CT ═ Δ CT (t) - Δ CT(s) so that the proportion of the target DNA (fritillaria pallidiflora) can be calculated as: sample (T)/standard (S)% > 2Absolute value of- Δ CT×100％；
Wherein the method can be used for detecting whether the sample contains Fritillaria pallidiflora; the probe primer is a probe primer with a sequence number of SEQ ID NO 22-27.
In some embodiments, each set of probe primers comprises three sequences, and the three sequences included therein are used simultaneously without resolution when any one set is used for detection.
In some embodiments, the sample is a herbal medicine, a decoction piece, or a prescription preparation.
In some embodiments, the step of extracting DNA is quantitative and purity determination using ultraviolet spectrophotometry.
In some embodiments, the reaction conditions comprise: pre-denaturation at 94 ℃ for 5min, denaturation at 94 ℃ for 30s, annealing at 60 ℃ for 30-60 s, and collecting fluorescence at 60 ℃. The reaction conditions may be adjusted according to the nature of the reaction premix selected.
In another aspect, the invention provides the use of the probe primer, wherein the probe primer is a probe with a sequence number of SEQ ID NO: and/or the probe primer shown; the probe primer realizes the specificity detection of Fritillaria pallidiflora by a fluorescent quantitative PCR detection method.
In some embodiments, each set of probe primers comprises three sequences, and the three sequences included therein are used simultaneously without resolution when any one set is used for detection.
In some embodiments, the sample tested is a herbal medicine, decoction piece, or a formulation.
In another aspect, the invention provides a kit. The kit contains the probe primer and is used for detecting specificity of Fritillaria pallidiflora.
Drawings
FIG. 1 shows the specificity test of probe primers. Positive amplification is only generated when Fritillaria pallidiflora is detected, and other Fritillaria pallidiflora is not detected;
FIG. 2 shows the detection limit test of the method, from 1 to 5, the DNA concentrations were 100ng, 10ng, 1ng, 0.1ng and 0.01ng, respectively; the DNA concentration can still be detected when being 0.01ng, which indicates that the method has higher sensitivity;
FIG. 3 shows the detection limit test of Fritillaria pallidiflora adulteration, two groups of curves are respectively the detection conditions of 100% Fritillaria pallidiflora and 0.1% Fritillaria pallidiflora adulteration samples, and 1 and 2 are respectively the total Fritillaria pallidiflora probe primer and the Fritillaria pallidiflora specific probe primer.
Detailed Description
The present invention is described in further detail below with reference to the drawings and examples, which are illustrative only and therefore should not be construed as limiting the scope of the present invention.
Instrument and reagent
A real-time fluorescent quantitative PCR instrument (AB 7500FAST),analytical balance (Mettler AB135-S), water purification apparatus (Millipore Corp.), ball mill (M400, Retsch), micro ultraviolet spectrophotometer, high speed centrifuge, metal heater. Plant genome extraction kit (DP321, Tiangen Biochemical technology Co., Ltd.),
Universal Master Mix II。
second, sample collection
6 original samples of bulbus fritillariae cirrhosae, fritillaria ussuriensis, fritillaria pallidiflora, other common medicinal fritillaria and commercial samples with accurate sources are collected, and the total amount is more than 100 batches. The specific information is shown in the sample information table of the attachment 1.
Thirdly, sample treatment and DNA extraction
1. Sample processing and DNA extraction
Grinding the test sample into fine powder, precisely weighing 20mg, and extracting DNA with plant genome extraction kit to obtain test sample solution. The Fritillaria pallidiflora comparison medicinal material is prepared into superfine powder, precisely weighed to 20mg, and prepared into positive comparison solution by the same method. If the preparation is a prescription preparation, the sampling amount can be increased to 50-200 mg as appropriate.
2, DNA extraction specific steps:
mu.l of buffer FP1 and 6. mu.l of RNase A (10mg/ml) were added thereto, and the mixture was vortexed for 1min and allowed to stand at room temperature for 10 min. Add 130. mu.l of buffer FP2, mix well and vortex for 1 min. Centrifuge at 12,000rpm (. about.13,400 Xg) for 5min and transfer the supernatant to a new centrifuge tube; and repeating the steps. 0.7 volumes of isopropanol (e.g., 500. mu.l of supernatant plus 350. mu.l of isopropanol) are added to the supernatant, mixed well by inversion, centrifuged at 12,000rpm (. about.13,400 Xg) for 2min, the supernatant is discarded, and the pellet is retained. Adding 600 μ l 70% ethanol, vortexing and shaking for 5sec, centrifuging at 12,000rpm (13,400 Xg) for 2min, and discarding the supernatant; and repeating the steps. Opening the cover and inverting, standing at room temperature for 5-10min, and air drying the residual ethanol completely. Adding elution buffer TE 100 μ l, dissolving DNA in 65 deg.C water bath for 10-30min to obtain DNA solution, and standing at 4 deg.C or-20 deg.C for use.
Can also be extracted by silica gel centrifugal column method. For the preparation of the formula, an optimized CTAB extraction method and the like can be adopted to obtain a DNA template solution with sufficient purity (generally, OD260/280 is required to be between 1.7 and 1.9).
Fourth, establishment of fluorescent quantitative PCR detection method
1. Probe primer design and screening
And (3) designing probe primers in the intra-species conserved and inter-species different regions according to the DNA sequence analysis and alignment of the ITS and the psbA-trnH region, wherein the 5 'end of the probe is marked with a fluorescein group FAM or VIC, and the 3' end of the probe is marked with a non-fluorescein quenching group BHQ 1. More than 2 sets of probe primers were designed for each target species.
PCR reaction System and reaction conditions
Reaction system: the volume was 20. mu.L, including 10. mu.L of the fluorescent PCR reaction mixture (2X), 0.5. mu.L each of the upstream and downstream primers and probe (10. mu. mol/L), 1. mu.L of the template DNA, and autoclaved ultrapure water to a total volume of 8.1. mu.L. And preparing a sample to be detected and a reaction solution of a positive control according to the system. The blank control was a reaction system containing no template DNA and the template DNA was replaced with an equal volume of autoclaved ultrapure water. The sample and the control are provided with three replicates, and the CT value is the average value of the three replicates as the final result.
Reaction conditions are as follows: 2 minutes at 50 ℃; 10 minutes at 95 ℃; 95 ℃, 15 seconds, 60 ℃,1 minute, 40 cycles.
TABLE 1 Probe primer specificity study
TABLE 2 general Probe primer commonality examination
Fifth, methodology investigation
1. Specialization inspection
And (4) carrying out species specificity investigation on the screened probe primer. The probe primers for Fritillaria pallidiflora were negative for 6 primitive species of Fritillaria cirrhosa and other Fritillaria (Table 2).
2. Examination of applicability
The probe primers obtained by screening are adopted to test different producing areas and sources of Fritillaria pallidiflora, each sample obtains a positive result, and the CT mean value of different samples is 23.40 (table 3).
TABLE 3 Fritillaria pallidiflora detection results of different producing areas and sources
3. Repeatability of
And (3) carrying out three-time repeated detection on 6 original samples of Fritillaria pallidiflora and Fritillaria cirrhosa by using the probe primers obtained by screening. The detection results showed that Fritillaria pallidiflora was positive, and the 6 original samples of Fritillaria pallidiflora were negative (Table 4).
TABLE 4 Fritillaria pallidiflora Probe primer test results repeated three times
4. Precision degree
Three parallel groups of the same sample were set up in the same experiment and the standard error (SD) was calculated from the CT value of each group, 0.30 for Fritillaria pallidiflora (Table 5).
TABLE 5 examination of Fritillaria pallidiflora detection method for precision
5. Recovery rate
And (3) detecting samples of the Fritillaria pallidiflora/Fritillaria taipaiensis at different mixing ratios by using the probe primers obtained by screening, calculating the adulteration ratio by using a CT difference method, and taking the percentage of the calculated value to the expected value as the recovery rate. The recovery rate of Fritillaria pallidiflora adulteration quantitative detection is 104-116% (Table 6).
TABLE 6 Fritillaria pallidiflora adulterated quantitative detection situation
6. Inspection limit investigation
When the Fritillaria pallidiflora DNA raw solution is diluted in a gradient way, the DNA concentration can still be detected under the condition of 0.01ng (figure 2). When the mixed samples of Fritillaria pallidiflora and Fritillaria taipaiensis in different proportions are detected, the stable detection can be still realized when the Fritillaria pallidiflora accounts for 0.1 percent (figure 3).
7. Calculation or determination method
1) For qualitative detection, the CT value threshold can be set at 35, CT <35 is considered detected.
2) For semi-quantitative detection, a standard substance (Fritillaria pallidiflora reference medicinal material or standard preparation is selected according to different detection targets) is required to be set as a reference, and the number of amplification rounds when a threshold value is reached is a CT value in view of exponential amplification of polymerase chain reaction; the difference between the CT values of the standard sample (S) and the test sample (T) is expressed by Δ CT, and the ratio of the target DNA in the test sample can be expressed as: sample (T)/standard (S)% > 2Absolute value of-Delta CTX 100%. Theoretically, the adulteration ratio was 6.25% when the absolute value of Δ CT was 4, and 3.125% when the absolute value of Δ CT was 5 (table 7). In actual detection, the absolute value of delta CT of a sample with adulteration proportion of 5% is between 4 and 5. In view of the fact that the medicinal material decoction pieces are allowed to have impurities within 3 percent and the error condition in detection is fully considered, the absolute value of Delta CT is less than or equal to 4 and is generally used as the detection judgment basis. The severity of the detection criteria can be controlled by adjusting the magnitude of this value, with larger values setting lower detection limits and more stringent criteria.
3) For quantitative detection, on one hand, a standard substance (S) is simultaneously set, and on the other hand, double-probe labeling in the same system is adopted for amplification, namely, the target probe (P) and the internal reference probe (C) are included. The quantitative detection ratio of the target probe (P) and the internal reference probe (C) in the sample can be expressed as Δ CT (t), and the corresponding standard can be expressed as Δ CT(s) and Δ CT (t) - Δ CT(s). Then the calculation formula of the proportion of the target DNA (Fritillaria pallidiflora) can be expressed as follows: sample (T)/standard (S)% > 2Absolute value of- Δ CT×100％。
TABLE 7 Absolute value of Delta CT corresponding to different adulteration ratios
8. Sample detection
The commercially available fritillaria cirrhosa samples, (SSCB 1-SSCB 10), fritillaria thunbergii powder and the adult preparation are tested, so that 2 batches of fritillaria cirrhosa samples detect positive fritillaria pallidiflora, and the fritillaria pallidiflora powder and the adult preparation containing fritillaria cirrhosa detect positive fritillaria pallidiflora (Table 8).
TABLE 8 sample testing conditions
Sixth, discuss
Fritillaria pallidiflora is one of the main counterfeit sources of Fritillaria cirrhosa. The research establishes a Fritillaria pallidiflora adulteration detection method based on TaqMan probe fluorescent quantitative PCR technology, and reasonably sets the threshold limit of detection, so that the existence of a counterfeit product can be effectively detected, and misjudgment caused by overhigh sensitivity of the technology is avoided. The method is universal, and is suitable for qualitative or quantitative detection of Fritillaria pallidiflora in medicinal materials, decoction pieces (such as Bulbus Fritillariae Cirrhosae powder) and preparations.
Accessories:
Specific embodiments are described in detail herein, however, this is by way of example for purposes of illustration only and is not intended to limit the scope of the claims which follow. It should be understood that various substitutions, alterations and modifications to the embodiments described herein may be made without departing from the spirit and scope of the invention as defined by the appended claims and shall therefore fall within the scope of the invention as hereinafter claimed.
Claims (10)
1. A probe primer, wherein the probe primer consists of SEQ ID NO: 22-27.
2. A fluorescence quantitative PCR detection method for specificity detection of Fritillaria pallidiflora is characterized by comprising the following steps:
weighing a fritillaria sample and pretreating the sample;
extracting DNA from the sample and preparing a DNA template; and
selecting a probe primer;
optimizing reaction conditions;
and setting different judgment bases according to different detection requirements.
Setting different judgment bases according to different detection requirements; wherein for qualitative detection, the threshold is determined based on a set CT value (e.g., CT)<35) Judging whether the detection is carried out; for semi-quantitative detection, the absolute value of the difference between the CT value of the positive control and the CT value of the positive control is used as a judgment basis, and the smaller the difference is, the higher the content is(ii) a For quantitative detection, on one hand, a standard substance (S) is simultaneously set, and on the other hand, double-probe labeling in the same system is adopted for amplification, namely a target probe (P) and an internal reference probe (C) are included; the quantitative detection ratio of the exclusive probe (P) and the universal probe (C) in the test sample can be expressed as Δ CT (T), and the corresponding standard can be expressed as Δ CT (S), Δ CT (T) - Δ CT (S) so that the calculation formula of the proportion of the target DNA (Fritillaria pallidiflora) can be expressed as follows:
wherein the method can be used for detecting whether the sample contains Fritillaria pallidiflora; the probe primer is the probe primer with the sequence number of SEQ ID NO22-27 in claim 1.
3. The method of claim 2, wherein each set of probe primers comprises three sequences, and wherein the three sequences included in any set are used simultaneously without resolution when used for detection.
4. The method of claim 2, wherein the sample is a herbal medicine, a decoction piece, or a formulation.
5. The method of claim 2, wherein said step of extracting DNA uses uv spectrophotometry for quantification and purity determination.
6. The method of claim 2, wherein the reaction conditions comprise: pre-denaturation at 94 ℃ for 5min, denaturation at 94 ℃ for 30s, annealing at 60 ℃ for 30-60 s, and collecting fluorescence at 60 ℃. The reaction conditions may be adjusted according to the nature of the reaction premix chosen.
7. Use of a probe primer, wherein the probe primer is the probe primer set according to claim 1; the probe primer realizes the specificity detection of Fritillaria pallidiflora by a fluorescent quantitative PCR detection method.
8. The use of claim 7, wherein each set of probe primers comprises three sequences, and wherein the three sequences included in any set are used simultaneously without resolution when used for detection.
9. The use of claim 7, wherein the sample tested is a herbal medicine, decoction piece or a formulation.
10. A kit comprising the probe primer of claim 1, and wherein the kit is used for specific detection of fritillaria pallidiflora.
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| CN114540346A (en) * | 2022-02-28 | 2022-05-27 | 中国食品药品检定研究院 | Probe primer and fluorescent quantitative PCR detection method and application thereof for fritillaria ussuriensis specificity detection |
| CN114540346B (en) * | 2022-02-28 | 2024-04-16 | 中国食品药品检定研究院 | Probe primer, fluorescence quantitative PCR detection method for fritillary bulb specificity detection and application thereof |
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