Sodium alginate is derived frombrown algagenerickelporsea grapeMiddle extractioniodineandmannitolSubsequentby-productIts molecule consists of β -D- mannuronic acid (β -D-mannuronic, m) and α -L- guluronic acid (α -l -L-guluronic, g) press (1→ 4) key connection. The aqueous solution of sodium alginate has high viscosity and has been used as food.Thickener、stabilizing agent、emulgatorWait. Sodium alginate is a non-toxic food, which was included in the United States Pharmacopoeia as early as 1938. Sodium alginate contains a lot of — COO－-,which can show polyanionic behavior in aqueous solution and has certain adhesion, can be used as a drug carrier for treating mucosal tissue. Under acidic conditions, — COO－-into — COOH，ionization degreeWhen decreasing, the hydrophilicity of sodium alginate decreases, the molecular chain shrinks and the pH value increases, — COOH group dissociates constantly, and the hydrophilicity of sodium alginate increases and the molecular chain stretches. Therefore, sodium alginate has obvious pH sensitivity. Sodium alginate can quickly form gel under extremely mild conditions, when Ca2+, Sr2+ and so on are present.cationWhen it exists, Na+ on G units reacts with divalent cations, and G units pile up to form cross-linked network structure, thus forming hydrogel. Sodium alginate formationgelMild conditions, which can avoid sensitive drugs, protein,cellandenzymeInactivation of such active substances. Because of these excellent characteristics, sodium alginate has been widely used in food industry and medicine.
People are interested insodium alginateIt is generally known that sodium alginate is a thickener and additive for food. But how much do you know about its nature? Today, let Qingdao Nanshan Biotechnology Xiaobian popularize the nature of sodium alginate.
> sodium alginate is white or yellowish powder, almost odorless.
Sodium alginate is soluble in water and has good gelatinization performance, so it can be expanded by adding warm water. Strong hygroscopicity, good water retention, insoluble in ethanol, ether, chloroform and acid (pH<3).
The stability of sodium alginate is better when the pH value is between 6 and 11. When the PH value is lower than 6, alginic acid is precipitated and insoluble in water. When the PH value is higher than 11, it will coagulate again. The viscosity reaches its maximum at PH 7, but it will drop significantly with the increase of temperature.
Sodium alginate is not resistant to strong acid, strong alkali and some heavy metal ions, because they will make alginic acid agglomerate, but alkali metals (sodium and potassium) will not freeze sodium alginate slurry.
Sodium alginate aqueous solution will precipitate alginate gel when it meets acid, and will immediately solidify into salts of these metals when it meets divalent metal ions such as calcium, iron, lead, etc., which are insoluble in water and precipitate.
Sodium alginate is low in heat and non-toxic. There are many kinds of sodium alginate, including red algae, green algae and brown algae.
Through a brief introduction, I believe that I have a simple understanding of the properties of sodium alginate. Please call if you need to know more..
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