Method for detecting residual quantity of multiple alkaline drugs in animal derived food
A technology of animal origin and detection method, applied in the fields of food safety and analytical chemistry, can solve the problems of inability to meet the requirements of detection and detection limit, complicated steps, and high separation requirements
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Embodiment 1
[0047] Sample preparation and determination methods for 76 veterinary drug residues in pork:
[0048] (1) Accurately weigh 5g (accurate to 0.01g) uniform sample, add 30mL acetonitrile, 2mL isopropanol and 10mL citric acid buffer solution (pH=2.5, weigh 10.5g citric acid monohydrate) into a 50mL plastic centrifuge tube (C 6 h 8 o 7 .H 2 O) and 10.2g magnesium chloride hexahydrate (MgCl 2 .6H 2 (0) Dissolve in 450mL water, adjust the pH to 2.5 with ammonia water, dilute with water to 500mL), vortex and extract at 2000r / min for 5min, centrifuge at 4000r / min for 5min, and transfer the supernatant to a 250mL pear-shaped bottle. Repeat the above extraction operation, combine the extracts, add 6mL of isopropanol, and concentrate at a temperature of 40±2°C to about 5mL by rotation, transfer the concentrate to a 50mL plastic centrifuge tube, and rinse the pear-shaped bottle with 5mL of citric acid buffer , combined washings, refrigerated centrifugation at 8,500 r / min for 10 min a...
Embodiment 2
[0072] Sample preparation and determination method for 76 kinds of veterinary drug residues in pig liver:
[0073] (1) Accurately weigh 2g (accurate to 0.01g) uniform sample, add 15mL acetonitrile, 1mL isopropanol and 5mL citric acid buffer solution (pH=2.5, weigh 10.5g citric acid monohydrate) into a 50mL plastic centrifuge tube (C 6 h 8 o 7 .H 2 O) and 10.2g magnesium chloride hexahydrate (MgCl 2 .6H 2 (0) Dissolve in 450mL water, adjust the pH to 2.5 with ammonia water, dilute with water to 500mL), vortex and extract at 2000r / min for 5min, centrifuge at 4000r / min for 5min, and transfer the supernatant to a 250mL pear-shaped bottle. Repeat the above extraction operation, combine the extracts, add 3mL of isopropanol, and concentrate at a temperature of 40±2°C to about 5mL, transfer the concentrate to a 50mL plastic centrifuge tube, and rinse the pear-shaped bottle with 5mL of citric acid buffer , combined washings, refrigerated centrifugation at 8,500 r / min for 10 min a...
Embodiment 3
[0080] Sample preparation and determination methods for 76 veterinary drug residues in eggs:
[0081] (1) Accurately weigh 2g (accurate to 0.01g) uniform sample, add 15mL acetonitrile, 1mL isopropanol and 5mL citric acid buffer solution (pH=2.5, weigh 10.5g citric acid monohydrate) into a 50mL plastic centrifuge tube (C 6 h 8 o 7 .H 2 O) and 10.2g magnesium chloride hexahydrate (MgCl 2 .6H 2 (0) Dissolve in 450mL water, adjust the pH to 2.5 with ammonia water, dilute with water to 500mL), vortex and extract at 2000r / min for 5min, centrifuge at 4000r / min for 5min, and transfer the supernatant to a 250mL pear-shaped bottle. Repeat the above extraction operation, combine the extracts, add 3mL of isopropanol, and concentrate at a temperature of 40±2°C to about 5mL, transfer the concentrate to a 50mL plastic centrifuge tube, and rinse the pear-shaped bottle with 5mL of citric acid buffer , combined washings, refrigerated centrifugation at 8,500 r / min for 10 min at 4°C, and pa...
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