Lactose
CAS: 63-42-3
MF: C12H22O11
MW: 342.3
A two sugar, molecular formula is C12H22O11, is in the milk of mammals, disaccharide, hence the name. Soluble in water, insoluble in ethanol, chloroform or ether. Its molecular structure is formed by a molecule of glucose and galactose molecule condensation. Slightly sweet flavor.
Lactose definition editor this paragraph
Lactose industry extracted from whey, used in the manufacture of baby food, candy, artificial milk. Medicine is used as a flavoring agent. This product is 4-O- beta -D- pyran galactosyl -D- glucose monohydrate.
Lactose is a disaccharide, English name for the Lactose; each consists of a molecule of beta -D- galactose and glucose in a molecular alpha -D- beta -1, 4- forming a glycosidic bond between. The molecular formula C12H22O11, molar mass of 342.3 G. There are two anomer: alpha and beta lactose lactose, in aqueous solution can be transformed into each other. Alpha lactose easily with a molecular crystal water. [1]
Sweetness is about 1/6 sucrose, solid components in milk is lactose 2-8%. The mammalian gut young can secrete lactase break down lactose into monose. The adult animal, including in vivo lactase most human except Caucasoid outside activity was greatly reduced. Therefore, drinking milk can produce diarrhea, bloating and other symptoms, known as lactose intolerance.
Adult animal if long continued drinking milk (starting with a small number of times slow drink is appropriate), also can stimulate the intestinal lactase activity and to increase a certain number, although the number and activity as early childhood, but still can effectively help break down lactose.
Edit this paragraph lactose effect
The 1 essential milk fermentation, carbon source. Lactose in the role of lactic acid bacteria, broken down into galactose and glucose.
2 provided for human nutrition, provide energy. Galactose has important effects on mammalian neural development. Lactose is conducive to calcium absorption. The lack of lactase cause lactose intolerance.
Have an important impact on dairy state organization 3. Milk production, milk lactose crystallization effect on taste. The solubility of milk powder.
There are 4 important effects on dairy products color, flavor. Browning reaction. After fermentation, flavor.
To promote the absorption of calcium
Lactose is not easy to be decomposed in the intestine, can remain in the intestine for long time. The effect of lactose lactase after the formation of organic acids, can make the intestinal pH decline, in under the action of acid can promote the absorption of calcium. In addition, lactose formed after decomposition of glucose also has a role in calcium absorption.
Intestines function:
In the small intestine is not lactase break down lactose would migrate to the large intestine, life in the large intestine bacteria can use lactose, which is accounted for by Lactobacillus, most Byfield lactose into lactic acid bacteria will, acetic acid, so that intestinal pH decline, these organic acids can stimulate the intestinal peristalsis, so has the intestines function, can prevent the baby constipation.
Edit this paragraph lactose traits:
Lactose is a white crystalline granules or powder; odorless, slightly sweet flavor. Sugar sweetness is 15%, and the beta lactose than alpha lactose sweetness large. There are a variety of lactose supply market: anhydrous lactose, the lactose monohydrate and anhydrous called beta small amounts of lactose.
Lactose is soluble in water, insoluble in ethanol, chloroform or ether.
Specific rotation to take this product, drying at 80 deg.c for 2 hours, accurately weighed, dissolved in water and diluted into quantitative solution containing the product of 0.10g and ammonia solution 0.02ml per 1ml, according to the determination of (Appendix VI E), optical rotation of +52.0 DEG to +52.6 deg.
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