▎ 摘　　要

NOVELTY - An aflatoxin enriching and purifying method involves adding a graphene alloy nanometer material synthesized from graphene and gold ball to a sample extract of an agricultural product to carry out toxin adsorption. The sample extract of the nanomaterials is filled with an empty solid phase extraction column with a gasket, after draining, the surface is covered with a layer of gasket. The eluent is removed by leaching of the eluent. The sample extract is obtained, the graphene alloy nano material is prepared by adding the chloroauric acid and the L-ascorbic acid to the deionized water. USE - Method for enriching and purifying aflatoxin in peanut, corn and wheat. ADVANTAGE - The method for enriching and purifying aflatoxin in simple and stable manner. DETAILED DESCRIPTION - An aflatoxin enriching and purifying method involves adding a graphene alloy nanometer material synthesized from graphene and gold ball to a sample extract of an agricultural product to carry out toxin adsorption. The sample extract of the nanomaterials is filled with an empty solid phase extraction column with a gasket, after draining, the surface is covered with a layer of gasket. The eluent is removed by leaching of the eluent. The sample extract is obtained by adding an agricultural product sample into an aqueous methanol solution or an aqueous acetonitrile solution, blowing the nitrogen gas to near-dryness, and adding the adsorbent solution to dissolve the sample to obtain the sample, the volume percentage of methanol or acetonitrile is 20-100%, the adsorption liquid is methanol aqueous solution or acetonitrile aqueous solution, the volume percentage of methanol or acetonitrile is 0.1-50%, eluent is N-hexane, aqueous solution of acetone containing formic acid or acetic acid or an aqueous solution of methanol or an aqueous acetonitrile solution, the graphene alloy nano material is prepared by adding the chloroauric acid and the L-ascorbic acid to the deionized water at room temperature, volume ratio of chloroauric acid, L-ascorbic acid and deionized water is 0.1-10: 0.5-50: 10-1000, adding sodium citrate solution to stop the reaction, centrifuging after ultrasonic oscillation of gold ball solution, dissolving the graphene in water, adjusting solution pH 8-12 with sodium hydroxide adding cysteine, heating at 60-100 degrees C for 0.5-8 hours, after centrifugation of water dissolved in graphene cysteine solution, preparing graphene cysteine solution by adding gold ball solution reaction for 5 min to 2 hours to obtain graphene alloy nano-material solution.