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Fiber refers to a complex of carbohydrates and other substances in the cell walls of edible plants. Although the fiber can not be digested and absorbed by the human body, its nutritional value is very low, but it can absorb and retain water, increase the volume of the feces, promote intestinal motility, and prevent the formation and reduction of cholesterol in the plasma. Therefore, cellulose has It can prevent the effects of various diseases such as colon cancer, appendicitis and heart disease and is an indispensable and important part of human food. Therefore, the determination of cellulose in food is very important. Let's talk about a specific method for measuring cellulose with a 1.25 g/100 ml acid-base detergent.
1 Determination principle of Crude Fiber Tester Samples were heated at 1.25 g/100 ml sulfuric acid and 1.25 g/100 ml sodium hydroxide solution for 30 min under boiling conditions to release starch, pectin, protein, fat, partial hemicellulose and lignin water. In the end, the residue obtained is weighed and the ash content is subtracted to obtain the crude fiber content.
2 apparatus appliances
a. Analytical balance: Sensitivity 0.0001g;
b. Experimental crusher;
c. hot plate;
d. Ma Fu furnace;
e. Electric blast drying box;
f. Nylon Sieve JP 72×1 (200 mesh);
g. tall beaker: volume 600ml;
h. Gu's cockroach: volume 25ml;
i. With valve exhaust pipe;
j. Filter flask: volume 500ml;
k. Desiccant.
3 Reagents
a. 95% ethanol;
b. ether;
c. litmus paper;
d. Pickling asbestos;
e. 1.25g/100ml sulfuric acid;
f. 1.25g/100ml sodium hydroxide.
4 Operation method
4.1 Weigh the sample: Weigh 2-3 g of the crushed sample, accurate to 0.0001g, and pour it into a 500ml beaker. If the fat content of the sample is high, the residue after fat extraction may be used as a sample, or the fat of the sample may be extracted with ether.
4.2 Acid treatment: Add 200ml of sulfuric acid (1.25g/100ml) boiled under reflux in the beaker containing the sample, and record the height of the liquid in the beaker. Put the watch glass on the electric stove, boil in 1 min, and continue boiling slowly for 30 min. In the boiling process, add boiling water to maintain the liquid level, often turn the beaker, then leave the heat source, wait until the sediment sinks, remove the supernatant with a glass wool filter tube, immediately add 100 ~ 150ml boiling water after the net wash Precipitate, absorb the supernatant again, and wash the precipitate repeatedly with boiling water until the test is neutral with litmus paper.
4.3 Alkaline solution treatment: Incorporate the glass wool in the suction filter tube into the precipitate, add 200ml of 1.25g/100ml sodium hydroxide solution that has been boiled under the refluxing device, and heat the microboiling for 30min according to the acid treatment method to remove the beaker. After the precipitate is allowed to sink, it is filtered hot until it is treated with a constant weight of Oldham's crucible, and the precipitate is transferred to the crucible with boiling water without loss and washed to neutrality.
4.4 Ethanol and ether treatment: The precipitate is first washed with 3~4 times of 20~25ml of ethanol heated to 50~60[deg.]C, and then washed with diethyl ether 20~25ml 3~4 times, and finally the ether is extracted.
4.5 Drying and Ignition of Goshen's crucible and precipitation, first bake it to constant weight at 105°C, then send it to 600°C high-temperature furnace and burn it for 30min, take it out to cool and weigh, and then burn it for 20min to constant weight.
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