How to improve crude fiber determination method
How to improve crude fiber determination method
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, the nutritional value is very low, but it can absorb and retain water, increase the volume of feces, promote intestinal motility, and prevent the formation and decrease of cholesterol in 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. The standard determination of crude fiber content is the national standard method, ie, the samples are heated under boiling conditions for 30 minutes by 1.25 g/100 ml sulfuric acid and 1.25 g/100 ml sodium hydroxide solution respectively to make starch, pectin, egg self-quality, fat, and part of the fiber The lignin and lignin were hydrolyzed and removed. The final weighed amount was obtained by subtracting the mass of ash. That is, the crude fiber content was obtained. According to this principle, there are instruments for fiber measuring instruments on the market. The use of this instrument has greatly improved the efficiency of crude fiber measurement, because the fiber analyzer can measure six samples at the same time, and it is because of the measurement of crude fiber. Therefore, it is also called a coarse fiber analyzer.
GB method to determine the crude fiber content has some defects, the specific performance is as follows: 1. Heating plate heating, the temperature is not good control, low temperature can not reach boiling within 1min, high temperature is easy to produce a lot of foam, spill the cup outside the sample loss, The experiment failed. 2. When the acid and alkali solution is processed, the beaker should be covered with a watch glass, the condensation effect is not good, the level of the liquid in the beaker often changes, and the boiling water needs to be added at any time. This process takes time and affects the measurement result. 3. At the end of the acid-base solution treatment, the suction tube is used to suck the clear solution, and then it is washed with boiling water until it is neutral. The process of removing the clear liquid with a glass wool filter tube takes too long and the sample is easy to lose. .
In view of the above shortcomings, the researchers have summarized some experiences through repeated experiments and provided corresponding improvement methods. Specific as follows: 1. The heating plate heating paste controller heating, this device has a fixed temperature timer device, both to ensure that boiling within 1min, but also to control the temperature, there are regular alarms, automatically alert the police to 30min, do not Special person control, can guarantee the heating temperature, but also can control the time well. 2. The beaker is covered with a watch glass and replaced with a condensation ball on the lid, which is cooled by cold water circulation to ensure accurate acid-base concentration in the beaker. 3. Change the glass wool suction filter to 200 mesh nylon sieve. This method saves time and labor, saves energy, and is simple and easy to operate.
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