L-rhamnose, also known as 6-deoxy-L-mannose, is an organic compound with the molecular formula C6H12O5 (however, the molecular formula given in some sources may contain water of crystallization, e.g. C6H12O6-H2O, resulting in a different molecular weight). The following is a detailed description of L-rhamnose:
1.Basic Information
Chinese name: L-Rhamnose
English name: L-Rhamnose Monohydrate
Alias: 6-deoxy-L-mannose, L-isotretinoin, l-mannose, etc.
CAS No.: 6155-35-7 (some information shows 10030-85-0. may be a different form or a version containing water of crystallization)
Molecular weight: 164.16 without water of crystallization, 182.17 with one molecule of water of crystallization.
Water solubility: soluble in water, slightly soluble in ethanol
Flash point: 149.7°C
2.Physical Properties
Appearance: Pure L-rhamnose is colorless crystalline powder.
Melting point: α-type is about 82～92℃, β-type is about 122～126℃.
Specific optical rotation: varies with temperature and concentration, such as α-type at 20 ℃ may be -7.7 ° to +8.9 °.
Crystalline form: there are two forms of α-type and β-type, α-type contains a molecule of water of crystallisation, after heating, it loses the water of crystallisation and transforms into β-type; β-type is very hygroscopic, and it transforms into α-type by absorbing moisture in the air.
3.Chemical Properties
Reducibility: L-rhamnose has reducibility, can be oxidised by bromine to form rhamnous acid, oxidised by nitric acid to form L-arabinitrilotrihydroxyglycolic acid.
Other reactions: sodium amalgam reduction can be obtained rhamnitol
4.Uses
Food: L-rhamnose can be used as a sweetener, its sweetness is about 33% of sucrose. In baked goods, meat products, dairy products, candy, chewing gum, soft drinks and other food applications. In addition, it can also be used to produce flavours and fragrances.
Pharmaceutical field: L-rhamnose has a variety of health effects such as promoting digestion, enhancing immunity, assisting in lowering blood sugar. It can promote the secretion of gastric acid, which can help the digestion and absorption of food; it contains rich nutrients, which can replenish the body’s needs; the sugar content is low, which is suitable for people with high blood sugar to drink in moderation.
Other fields: L-rhamnose can also be used in biochemical reagents, scientific research experiments and other fields.
5.Precautions
Although L-rhamnose has a variety of health effects, but is not a drug, can not replace drug therapy.
For pregnant women, lactating women and other special groups, it is recommended to consult a doctor or professional advice before use.
In the process of use, if any discomfort occurs, you should seek medical treatment.
In summary, L-rhamnose is an organic compound with multiple uses and potential health benefits. However, it is still important to be aware of its applicability and dosage limitations when using it.