Method for ultrasonic extraction of rice grain crude fat
A technology of rice grains and crude fat, which is applied in the preparation of test samples, etc., can solve the problems of low extraction efficiency, many organic solvents, and large sample requirements, and achieve the effect of less solvent consumption, satisfactory processing, and short time
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[0036] Example 1 Ultrasonic extraction of crude fat from rice grains, follow the steps below:
[0037] (1) Dry and crush rice grains;
[0038] (2) Take an appropriate amount of the powder sample prepared in step (1) into the extract and mix it thoroughly;
[0039] (3) The crude fat is extracted under ultrasonic conditions, the fat enters the extraction liquid, and then insoluble impurities are removed to obtain a fat solution.
[0040] As an alternative, the method for extracting crude fat from rice grains by ultrasonic further includes step (4): removing the extract of the fat solution prepared in step (3) to obtain a crude fat product.
[0041] As an alternative, in the above method for ultrasonically extracting crude fat from rice grains, the step (4) specifically includes: subjecting the fat solution prepared in step (3) to vacuum condensation and rotary evaporation at 40-60°C to remove and extract Liquid; then dry the product to constant weight at 80-105°C.
[0042] As an alternat...
Example Embodiment
[0046] Example 2
[0047] The invention is further illustrated by the following tests:
[0048] (1) Determination method of rice crude fat extraction rate:
[0049] Centrifuge the extracted centrifuge tube at 5000 rpm for 10 minutes, and place the supernatant in a round bottom flask (bottle weight m 1 ), vacuum condensation and rotary evaporation at 40°C, and then bake the round bottom flask at 105°C to a constant weight (m 2 ), the calculated crude fat content m 2 -m 1 .
[0050] At the same time, take the same amount of samples according to the GB / T14772-93 method, and use the Soxhlet extraction method to extract the crude fat of rice grains, and the fat content is m 3 , The fat extraction rate is (m 2 -m 1 ) / m 3 .
[0051] (2) Extraction of rice crude fat:
[0052] Crude rice fat extraction: dry rice grains until the moisture content is less than 10%, crush and pass through a 100-mesh sieve, weigh 2g sample into a 50ml centrifuge tube, add 16-30ml of extractant, preferably about 20ml...
Example Embodiment
[0078] Example 3
[0079] Such as figure 1 , 2 As shown in 3, the embodiment of the present invention adopts optimized ultrasonic extraction of crude fat from rice grains, and the extraction process includes:
[0080] The rice grains are dried until the moisture content is less than 10%, crushed and passed through a 100-mesh sieve, weighing ≥1.5g into a 50ml centrifuge tube. Add chromatographically pure n-hexane and mix evenly, with a material-to-liquid ratio of 1g:8~15ml, and place it in an ultrasonic device with distilled water as the solvent, and extract for 37 minutes at an ultrasonic power of 123W and a temperature of 42°C.
[0081] The crude fat extraction rate of rice grains under this ultrasonic method was 77.31%.
[0082] As a comparison, the same amount of samples were taken according to the GB / T14772-93 method, and the crude fat of rice grains was extracted by Soxhlet extraction method, and the extraction rate of crude fat of rice grains was 77.31%. Soxhlet e...
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