Views: 0 Author: Site Editor Publish Time: 2022-10-12 Origin: Site
Sorbitol is the main photosynthesis product of Rosaceae plants. It is white hygroscopic powder or crystalline powder, flakes or granules, odorless. Depending on the crystallization conditions, the melting point varies from 88 to 102 °C, and the relative density is about 1.49. Soluble in water (1g dissolves in about 0.45mL water), slightly soluble in ethanol and acetic acid. It has a cool sweetness, the sweetness is about half of that of sucrose, and the calorific value is similar to that of sucrose. It will not cause dental caries when used as a sweetener. In the food industry, it is mostly sorbitol liquid with a content of 69~71%. Toxicity tests have shown that oral overdose can cause diarrhea and digestive disorders.
This product is a 50% or 70% sorbitol aqueous solution, a viscous transparent liquid, optically active, slightly sweet, hygroscopic, it can dissolve a variety of metals, and it is unstable at high temperatures. It can participate in reactions such as anhydride, esterification, etherification, oxidation, reduction and isomerization, and it can form complexes with various metals.
Sorbitol can be prepared by the reduction of glucose and it is widely distributed in pears, peaches and apples, with a content of about 1% to 2%. Its sweetness is comparable to that of glucose, but it can give people a rich feeling. It is slowly absorbed and utilized in the body, and the blood sugar level does not increase. It is also a good humectant and surfactant.
It is one of the earliest sugar alcohols allowed to be used as food additives in Japan to improve the moisture retention of food, or as a thickener. Can be used as a sweetener, such as in the manufacture of sugar-free chewing gum. It is also used as a moisturizing agent and excipient in cosmetics and toothpaste, and can be used as a substitute for glycerin.
1. The prepared 53% aqueous glucose solution was added to the autoclave, and the nickel catalyst of 0.1% by weight of glucose was added. After replacing the air, hydrogenation is carried out under the conditions of about 3.5MPa, 150°C, and pH 8.2-8.4, and the residual sugar is controlled below 0.5% at the end point. After 5min of precipitation, the obtained sorbitol solution was purified by ion exchange resin. Raw material consumption quota: hydrochloric acid 19kg/t, liquid caustic soda 36kg/t, solid alkali 6kg/t, aluminum-nickel alloy powder 3kg/t, oral sugar 518kg/t, activated carbon 4kg/t.
2. The refined glucose obtained from starch saccharification is obtained by continuous or intermittent hydrogenation at medium pressure.
3. Add 53% glucose aqueous solution (preliminarily adjusted pH=8.2~8.4 with lye) and 0.1% nickel-aluminum catalyst of glucose mass into the autoclave, exhaust the air and carry out the reaction, control the temperature to 150℃ and the pressure to 3.5MPa:
When the glucose content was below 0.5%, the reaction reached the end point. Set aside for precipitation and filter. The filtrate is purified with strongly acidic styrene cation exchange resin 001×7 and strongly basic ammonium I type anion exchange resin 201×7 to remove impurities such as nickel and iron to obtain the finished product D-sorbitol.
1. It can be used as a raw material for the production of vitamin C. Sorbitol can be obtained by fermentation and chemical synthesis. It can also be used as a raw material for industrial surfactants to produce Span and Tween surfactants. Sorbitol has moisturizing properties and can replace glycerin in the production of toothpaste, cigarettes and cosmetics. Using sorbitol and propylene oxide as raw materials, polyurethane rigid foam with certain flame retardant properties can be produced. In the food industry, it can be used as a sweetener, humectant, chelating agent and tissue modifier. In the pharmaceutical industry, the sorbitan ester produced by nitration of sorbitol is a drug for the treatment of coronary heart disease. Food additives, cosmetic raw materials, organic synthesis raw materials, humectants, solvents, etc.
2. Nutritional sweeteners, humectants, chelating agents and stabilizers. It is a special sweetener with moisturizing properties. It is not converted into glucose in the human body and is not controlled by insulin, so it is suitable for diabetics. It can be used in cakes, the maximum usage is 5.0g/kg; the maximum usage in surimi and its products is 0.5g/kg. It can also be used as a defoaming agent for sugar making, brewing and soy products. It can be used in moderation according to production needs. It can also be used for moisturizing raisins, thickening and preserving aroma of alcohol and refreshing beverages, as well as candy and chewing gum.
3. Synthetic resins and plastics, separation and analysis of low-boiling oxygenated compounds, etc. It is also used as a gas chromatography fixative, thickener, hardener, insecticide, etc.
4. It can be used as a stationary liquid in gas chromatography for the separation and analysis of low-boiling oxygen compounds, amine compounds, nitrogen or oxygen heterocyclic compounds. It is also used in organic synthesis.
5. It can be used as a moisturizing agent for toothpaste, cosmetics and tobacco. It is a substitute for glycerin, its moisturizing property is milder than that of glycerin, and its taste is also better. It can be used in combination with other moisturizers for a synergistic effect. It is also used in the pharmaceutical industry as a raw material for the manufacture of vitamin C.
6. Diuretic dehydrator. It is used to treat cerebral edema and increased intracranial pressure, to treat increased intraocular pressure of glaucoma, and also to edema and oliguria with normal heart and kidney function.
7. Aquatic water retention agent. The ratio of sucrose 2.1% + sorbitol 3.15% + complex phosphate 1.00% can effectively reduce the water activity of dried fish fillets and increase the activity of Ca-ATPase.
According to China's "Hygienic Standard for the Use of Food Additives" (GB2760-1996): Sorbitol (liquid) can be used in ice cream, popsicles, cakes, beverages, biscuits, bread, pickles and candies according to production needs. In actual production, sorbitol can be used as nutritional sweetener, humectant, chelating agent and stabilizer. Foods using sorbitol can be eaten by patients with diabetes, liver disease and cholecystitis. In addition to being used as a sweetener, sorbitol also has the functions of moisturizing, chelating metal ions, improving texture (making cakes delicate and preventing starch aging).