Pinyin Name:Qiongzhi

English Name:Agar

Agar is mainly made from Stonewort. Gracilaria. End-stage purple cabbage. Chickweed and other red algae with hot water extracted from a kind of seaweed polysaccharide. It is the first gelling agent used by human beings.

Chemical structure of agar

The chemical structure of agar is complex. It is generally believed that it is a chain-type molecular neutral sugar composed of the backbone of agar disaccharide. The agar disaccharide is a chain-type molecular neutral sugar consisting of 1.3-linked β-D-galactopyranose and 1.4-linked 3.6-endo-ether-α-L-galactopyranose linked repeatedly and alternately. Small amounts of L-galactose . 6-methyl-D-galactose and D-xylose are also present . and sulfate groups. Pyruvic acid and glucuronic acid.

Colloid chemical properties of agar

● Solubility: insoluble in cold water and inorganic. Organic solvents. Can be dissolved in water when heated above 85℃,

● Gelation: After dissolved in water. When cooled to 28-35℃, it will form a gel.

● Gel strength: the greater the molecular polymerization, the longer the molecular chain. The longer the molecular chain. The longer the molecular chain, the greater the gel strength, the content of galactose also has an effect on it,

● With acacia bean gum. Konjac Gum. Xanthan gum can produce synergistic effect. Improve the elasticity and water retention of the gel.

This product is a dehydrated and dried mucilage extracted from Gelidium amansii Lamx or several other species of red algae.

[Properties] The linear agar is in the form of long thin strips. Off-white or yellowish, translucent. The surface is wrinkled. Slightly glossy.

The texture is light, soft and tough. Not easy to break, completely dry. It is brittle and fragile, odorless. Odorless.

Powdered agar is scale-like powder. Colorless or light yellow, with cold water device. Under the microscope. Colorless

Irregular polygonal mucus fragments, odorless. Odorless.

This product is soluble in boiling water. Insoluble in cold water. But it can be swollen into a gelatinous mass, the aqueous solution shows neutral reaction.

[Identification] (1) Take about 1g of this product, add 65ml of water and boil. Stir continuously to dissolve. Make up the vaporized water with hot water. Cool to 32-39℃. It is condensed into translucent elastic gel. Heat to 85 ° C when the re-melting.

(2) Take fragments of the product. Immersed in 0.02 mol / L iodine solution. After a few minutes. Stained brownish-black. Remove. Gradually change to purple color after dipping in water.

(3) Take about 0.1g of this product, add 20ml of water, heat to dissolve, take out 4ml . Add hydrochloric acid 0.5ml. Heat on a water bath for 30 minutes. Add 3ml of sodium hydroxide test solution and 6ml of alkaline copper tartrate test solution. Heat in water bath. A red precipitate is formed.

[Check] Starch Take 0.10g of this product and add 100ml of water. Add 100ml of water and boil to dissolve. Let cool. Add 2 drops of iodine test solution. Do not show blue color. Loss of weight on drying Take the product (if it is in strip form, it should be cut into pieces). It should be cut into pieces.) Dry at 105 °C for 5 hours. Loss of weight should not exceed 22.0%.

Ash content Take about 1g of this product, and put it into a crucible which is blazed to constant weight. Precision weighing. Slowly burn until completely charred. Gradually increase the temperature to 600 -700 ℃. Make complete ashing and constant weight. Remaining ash should not be more than 5.0%.

Insoluble matter in water Take 1.5g of this product and put it in a beaker. Add water to make 200ml. Boil to dissolve. While hot with 105 ℃ constant weight No. 3 fused glass crucible filtration. Wash the beaker with hot water several times. Filtration. The filter residue is dried at 105 °C to a constant weight. The residue should not exceed 15 mg (1.0%).

Hydroscopicity Take 5.0g of this product and put it in 100ml measuring cylinder. Add water to make 100ml. Stir well. Let it stand at 25℃ for 24 hours. Filtered into another cylinder by moistened glass wool. The total amount of filtrate should not be more than 75 ml.

[Category] Fuser.

[Storage] Keep tightly closed. Store in a dry place.

Agar is made from red algae in the ocean. It is a polysaccharide extracted by scientific and technological methods. It does not have any chemical composition. It is a pure natural. High strength products. The product meets the Chinese national standard and export requirements. It can be used as coagulant. Suspending agent. Emulsifier. Freshness preservative. Specific uses are as follows:

Pharmaceuticals: blood pressure. Reduce fat. Antidiarrheal function. It can be used as culture medium for biological bacteria. Clinical medicine. Convective immunization. Medicine. Electrophoresis. Reagent. Hollow capsule. Turtle jelly and other products.

Foodstuffs: Fudge. Ice-cream. Jelly. Ham. Lunch meat. Sausage. Clan eggplant sauce. Coconut butter. Cheese. Usage: 0.3-1.5%.

Chemical industry: can be used as high-grade skin care cream. Hair styling gel. Hair Milk. Film and so on.

Construction: high viscosity. Long retention period. It can be used in all kinds of waterproof. It can be used in all kinds of waterproof and leakage-proof coatings and high-level latex paints.