A kind of determination method of fat peroxide value in milk powder
A technology of peroxide value and measurement method, which is applied in the direction of measuring device, preparation of test samples, chemical analysis by titration method, etc. It can solve the problems of immaturity and increase the difficulty of milk powder quality control, and improve the accuracy , to facilitate quality control, improve the effect of fat extraction rate
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Embodiment 1
[0034] A method for measuring fat peroxide value in milk powder, comprising the following steps:
[0035] First, take 40g of milk powder (without starch), dissolve it in a 500ml flat-bottomed flask with 40ml of distilled water, add 40ml of ethanol, plug the stopper and shake well, put it in an ultrasonic washer and vibrate ultrasonically for 20min to obtain the first mixture, take it out, and Add 50ml of ether to the first mixture, extract for 1min to obtain the second mixture, add 50ml of petroleum ether to the second mixture, extract for 0.5min, let it stand for 20min, separate the upper ether layer and pour it into dry and clean Put it into a 250ml flat-bottomed flask with a stopper, remove water through anhydrous sodium sulfate when pouring, and distill ether and petroleum ether on a rotary evaporator at a distillation temperature of 50°C. The residue obtained from the distillation is the fat in milk powder.
[0036] Then, take 2g of fat as sample, its quality is recorded ...
Embodiment 2
[0041] The same part of this embodiment and Embodiment 1 will not be repeated, the difference is:
[0042]Weigh 40g of milk powder (without starch), dissolve it in a 500ml flat-bottomed flask with 52ml of distilled water, add 52ml of ethanol, plug the stopper and shake well, put it in an ultrasonic washer and vibrate ultrasonically for 30min to obtain the first mixture, take it out, and pour it into the first Add 80ml of diethyl ether to the mixture, extract for 3min to obtain the second mixture, add 80ml of petroleum ether to the second mixture, extract for 1.5min, let stand for 40min, separate the upper ether layer and pour it into a dry and clean 250ml of known quality Put it into a flat-bottomed flask with a stopper, remove water through anhydrous sodium sulfate when pouring, distill ether and petroleum ether on a rotary evaporator at a distillation temperature of 50°C, and the residue obtained from the distillation is the fat in milk powder. Weigh 2-5g of fat as a sample,...
Embodiment 3
[0044] The same part of this embodiment and Embodiment 1 will not be described again, the difference is:
[0045] Weigh 40g of milk powder (containing starch), dissolve it in a 500ml flat-bottomed flask with 40ml of distilled water, add amylase, ultrasonically hydrolyze for 25min, add 40ml of ethanol, put on a stopper and shake well, put in an ultrasonic washer and vibrate ultrasonically for 25min to obtain the first The mixture was taken out, 50ml of ether was added to the first mixture, extracted for 2min to obtain the second mixture, 50ml of petroleum ether was added to the second mixture, extracted for 1min, left standing for 30min, the upper ether layer was separated and poured into a known Put it into a dry and clean 250ml flat-bottomed flask with a stopper, remove water through anhydrous sodium sulfate when pouring, and distill ether and petroleum ether on a rotary evaporator at a distillation temperature of 50°C. The residue obtained from the distillation is the milk po...
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Abstract
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