Sodium alginate is a by-product of the extraction of iodine and mannitol from kelp or Sargasso Uronic acid (α-L-guluronic, G) is connected by (1→4) bonds. It is a natural polysaccharide with the stability, solubility, viscosity and safety required for pharmaceutical preparation excipients. Sodium alginate has been widely used in the food industry fields.
Advantage
As a thickener for beverages and dairy products, sodium alginate has unique advantages in thickening: the good fluidity of sodium alginate makes the added beverage smoother; and it can prevent the viscosity drop during product disinfection. When using sodium alginate as a thickener, products with larger molecular weight should be used as much as possible, and Ca should be added in an appropriate amount. It can greatly increase the viscosity of sodium alginate.
Sodium alginate is a high-grade stabilizer for ice cream and other cold drinks, which can make ice cream and other cold drinks produce smooth appearance and smooth taste. Since calcium alginate can form a stable thermally irreversible gel, it will not become rough (ice crystal growth) during transportation and storage, and ice cream will not be deformed due to temperature fluctuations. Both the expansion rate and the melting point are increased, so that the quality and efficiency of the product are significantly improved. The product has a smooth, delicate taste and good taste. The addition amount is low, generally 1-3%, and the foreign addition amount is 5-10%.
Sodium alginate is used as a stabilizer for dairy products and beverages. The stabilized frozen milk has good taste, no stickiness and stiffness, stickiness and hysteresis when stirring.
Application
1. Application in food
Sodium alginate is used to replace starch and gelatin as a stabilizer for ice cream, which can control the formation of ice crystals, improve the taste of ice cream, and can also stabilize mixed beverages such as sugar water sorbet, ice sherbet, and frozen milk. Many dairy products, such as refined cheese, whipped cream, dry cheese, etc., use the stabilizing effect of sodium alginate to prevent the stickiness of food and packaging, and can be used as a covering for dairy accessories to stabilize and prevent frosting. Skin cracked.
Sodium alginate is used as a thickener for salad (a cold salad) dressing, pudding (a dessert), jam, ketchup and canned products to improve the stability of the product and reduce liquid exudation.
Adding sodium alginate to the production of dried noodles, vermicelli and rice noodles can improve the cohesiveness of the product structure, make it strong in tension, large in bending, and reduce the rate of broken ends, especially for flour with low gluten content, the effect is more obvious. Adding sodium alginate to bread, cakes and other products can improve the uniformity and water retention of the internal tissue of the products and prolong the storage time. Addition to frozen confectionary products can provide a thermal fusion protective layer, improve flavor escape, and increase melting point properties.
Sodium alginate can be made into various gel foods, maintains a good colloidal form, does not seep or shrink, and is suitable for frozen foods and artificial imitation foods. It can also be used to cover fruits, meat, poultry and aquatic products as a protective layer, without direct contact with the air, and prolong the storage time. It can also be used as a self-coagulation forming agent for bread icing, filling and filling, dessert coating, canned food, etc. The original shape can still be maintained in high temperature, freezing and acidic media. It can also be used instead of agar to make elastic, non-stick, transparent crystal soft candy.
2. Application in pharmaceutical preparations
Sodium alginate has been included in the US Pharmacopoeia as early as 1938. Alginic acid was included in the British Pharmacopoeia in 1963. Alginic acid is insoluble in water, but swells when placed in water. Therefore, traditionally, sodium alginate is used as a binder for tablets, while alginic acid is used as a disintegrant for immediate release tablets. However, the effect of sodium alginate on tablet properties depends on the amount included in the formulation, and in some cases sodium alginate can promote tablet disintegration. Sodium alginate can be added during the granulation process, rather than in the form of powder after granulation, which makes the production process simpler. The resulting sheet is mechanically stronger than using starch.
Sodium alginate is also used in the production of suspensions, gels and concentrated emulsions based on fats and oils. Sodium alginate is used in some liquid medicines to enhance viscosity and improve the suspension of solids. Propylene glycol alginate improves the stability of emulsions.
3. Application in printing and spinning industry
Sodium alginate is used as reactive dye paste in printing and dyeing industry, which is superior to grain starch and other pastes. The printed textiles have bright patterns, clear lines, high color yield, uniform color yield, and good permeability and plasticity. Seaweed glue is the best paste for modern printing and dyeing industry, and it is widely used in the printing of cotton, wool, silk, nylon and other fabrics, especially for preparing dye-dispensing printing paste.
The Chinese textile sector uses alginate and starch to mix or replace starch to prepare warp sizing, which can not only save a lot of grain, but also make warp fibers lint-free, resistant to friction, and less end-break rate, thereby improving the efficiency of weaving. Alginate is effective on both cotton fibers and synthetic fibers.
4. Application in the pharmaceutical industry
The PS-type gastrointestinal dual-imaging barium sulfate preparation made of alginate sulfate dispersant has the characteristics of low viscosity, fine particle size, good wall adhesion and stable performance.
PSS is a kind of fucoidan diester sodium developed with alginic acid as raw material, which has anticoagulant, blood lipid lowering and blood viscosity reducing effects.
Using seaweed glue instead of rubber and gypsum as dental impression material is not only cheap and easy to operate, but also the printed tooth shape is more accurate.
Alginate can also be used to make various dosage forms of hemostatic agents, including hemostatic sponge, hemostatic gauze, hemostatic film, scalded gauze, spray hemostatic agent, etc.
