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Quantification of aflatoxin M1 in raw milk by a core-shell column on a conventional HPLC with large volume injection and step gradient elution |
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| Affiliation: | 1. Analysis and Testing Centre of Sichuan Academy of Agricultural Science, Chengdu, 610066, PR China;2. Laboratory of Quality and Safety Risk Assessment for Agro-Products (Chengdu), Ministry of Agriculture, Chengdu, 610066, PR China;3. College of Chemistry, Sichuan University, Chengdu, 610065, PR China;4. College of Chemical Engineering, Sichuan University, Chengdu, 610065, PR China;1. Institute for Mechanical Process Engineering and Mechanics, Karlsruhe Institute of Technology, Karlsruhe, Germany;2. Institute for Technical Chemistry, Karlsruhe Institute of Technology, Karlsruhe, Germany;1. Center for Food Science and Nutrition, College of Natural Sciences, Addis Ababa University, P.O.BOX 1176, Addis Ababa, Ethiopia;2. Department of Industrial Chemistry, Addis Ababa Science and Technology University, Ethiopia;1. State Key Lab of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;2. School of Life Sciences, Fudan University, Shanghai 200433, China;3. School of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China |
| Abstract: | The immunoaffinity column cleanup method coupled with HPLC separation and fluorescence detection is still one of the most frequently used quantitative methods for routine analyses of AFM1. In this study, aflatoxin M1 (AFM1) was quantified with a chromatography column packed with 2.6 μm core-shell particles on a conventional HPLC. A large volume of solvent (100 μL) was injected into the highly efficient column without any noticeable reduction in separation performance with the help of stepwise gradient elution. The instrumental conditions were optimized by response surface analysis methodology (RSM) with a three-level three-factor Box–Behnken design.The use of core-shell columns on conventional HPLC for AFM1 analysis under the optimized instrumental conditions leads to increased analytical performance compared with traditional totally porous columns without the heavy costs associated ultra-high-pressure instruments. Moreover, the improved instrumental sensitivity enables simplified sample preparation by avoiding any solvent replacement. The method could be easily applied to enhance the sensitivity of HPLC-FLD for AFM1 analysis that is based on isocratic elution and is more widely used. The method was successfully applied to 40 raw milk samples collected in summer from 20 cattle ranches located in two different provinces in southwestern China. |
| Keywords: | HPLC-FLD Aflatoxin M1 Immunoaffinity column cleanup Core-shell column Step gradient elution Raw milk Aflatoxin M1 (PubChem CID: 15558498) Acetonitrile (PubChem CID: 6342) |
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