分子印跡Mn摻雜ZnS量子點(diǎn)磷光法檢測(cè)蘋(píng)果汁中的展青霉素
[Abstract]:(PAT) is a highly toxic small molecular mycotoxin, which often pollutes apple juice and products. The traditional PAT detection method has the disadvantages of time consuming and high cost. It is very important to develop a simple and fast PAT detection method. Mn doped ZnS quantum dots (Mn-ZnS) have excellent optical sensing performance, simple and non-toxic preparation. The detection sensitivity can be improved by phosphorescence emission. Because of the high reactive activity of PAT, it is difficult to prepare its antibody and there is no available antibody. Molecularly imprinted polymer (MIPs) is a kind of artificial recognition material, which is called artificial antibody. In this study, MIPs modified Mn-ZnS was used to construct phosphorescent nanosensor (MIP-Mn:ZnS) to detect PAT, in apple juice. The sensor is used to detect the PAT. in the actual sample. The main conclusions are as follows: 1. 6-hydroxynicotinic acid (6-HNA) was used as pseudo-template, 3-aminopropyl triethoxysilane (APTES) as functional monomer and tetraethyl silicate (TEOS) as crosslinking agent. A phosphorescence nanosensor with a particle size of about 24 nm was prepared by surface molecularly imprinted gel-sol technique under the optimum molar ratio of 6-HNA:APTES:TEOS=1:4:8. 2. Using 0.1 mol/L pH 6.0 PBS as the optimal buffer, the adsorption performance of the sensor shows that the adsorption ability and mass transfer rate of MIP-Mn:ZnS to PAT/6-HNA are significantly higher than that of non-imprinted quantum dots (NIP-Mn:ZnS). Compared with the structural analogue 2-HNA-6-HNA, the affinity quenching efficiency of MIP/NIP-Mn:ZnS was the highest in the presence of lataric acid and 5-hydroxymethylfurfural (5-HMF), PAT). The maximum imprinting factor was that 2.02.MIP-Mn:ZnS could be used in PAT and OTA,DON,. There was no significant effect on the detection of PAT, in the binary system of AFB1 when the concentration of 5-HMF was less than 30.9 渭 mol/L. The results show that MIP-Mn:ZnS has good affinity and selective recognition properties for PAT. 3. Under the optimized conditions (pH 6.0 / MIP-Mn: ZnS concentration 0.04 mg/mL, incubation time 30 min), PAT), the phosphorescence quenching of MIP-Mn:ZnS is in accord with Stern-Volmer equation (R2P 0.9945), and the quenching constant KSV,MIP can reach 48400 M-1. The linear range of the method is 0.430.50 渭 mol/L, and the detection limit (LOD) is 0.32 渭 mol/L.4.. The results of interference test showed that the possible organics in juice (sodium citrate, sucrose, glucose, fructose) and common anions (K, Na, Ca~ (2), Mg~ (2), Zn~ (2), Cu~ (2), Ni~ (2), Mn~ (2), Al3 and NO3-,SO42-,PO43- have no significant effect on MIP-Mn:ZnS detection of PAT, which indicates that MIP-Mn:ZnS has strong anti-interference ability and can be used in the phosphorescence detection of PAT in apple juice. The actual sample analysis shows that the recoveries of the method are 102.9% and 127.2% (the standard addition level is 1 渭 mol/L), and the relative standard deviation is less than 4.95%. The analytical results of this method were basically consistent with that of (HPLC) by HPLC (P0.05), which indicated that the method had good accuracy and feasibility. In this study, a simple, rapid and feasible non-immunophosphorimetric method for the detection of acropenicillin in apple juice was established, which can provide a theoretical and technical basis for rapid detection of acropenicillin in complex food matrix.
【學(xué)位授予單位】:西北農(nóng)林科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:TS255.44;O657.3
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