Did you know that sodium alginate can be used as packaging material?

Editor:Sodium alginate　　　　Source:Sodium alginate manufacturer　　　　2017-05-31 17:56

Sodium alginate is a by-product after extracting iodine and mannitol from kelp or Sargassum of brown algae, and its molecule is composed of β -D- mannuronic acid (β -D-mannuronic, m) and α -L- guluronic acid (α -l -L-guluronic, g) press (1→ 4) key connection, which is a kind ofNatural polysaccharideIt has the stability, solubility, viscosity and safety required by pharmaceutical excipients. Sodium alginate has been widely used in food industry and medicine.
　　　　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.

With the rapid development of food science and technology and packaging industry, many new packaging materials and packaging forms appear constantly. Among them, experts believe that edible environmental protection packaging materials will lead the sustainable development of food packaging industry. In recent years, sustainable packaging and green packaging have become hot topics in China's food packaging industry.

　　Ordinary packaging not only provides convenience for people's lives, but also produces packaging waste. This not only increases the burden on the environment, but also increases the possibility of resource waste. With the rapid development of food science and technology and packaging industry, many new packaging materials and packaging forms appear constantly. Among them, experts believe that edible environmental protection packaging materials will lead the sustainable development of food packaging industry.

　　Edible packaging film is a film with porous network structure, which is made of natural edible substances, such as protein and polysaccharide, through the interaction between different molecules. Among them,sodium alginateIt is an excellent film-forming material. Sodium alginate is easily soluble in water, and can be processed into a uniform and transparent film after forming a uniform and viscous liquid. The tensile strength, flexibility, water resistance and solubility of the film can be improved by compounding sodium alginate with other colloids.

　　This scientific research achievement has been patented. This edible protein film can be dissolved in water at high temperature, which can not only replace the plastic film packed with crab sticks, but also replace the packaging of instant noodle seasoning, so that when cooking instant noodles, just throw the seasoning bag directly into the water.

　　Edible vegetable paper can be made by edible film forming technology. Taking fresh vegetables as the main raw material, adding sodium alginate, etc., the new food is made by drying and molding. It not only retains the flavor and nutritional components of the raw materials, but also has the characteristics of low sugar, low fat and low calorie. It is rich in dietary fiber, vitamins and minerals, refreshing and delicious, and has a unique flavor. It can be used to make edible paper of various vegetables according to the needs of different people.

　　Take carrot and vegetable paper as an example:

　　1. Reference formula:

　　Carrot 100%, sodium alginate 0.8%, CMC-Na 0.5%, agar 0.4%, glycerol 2.5%, salt and sugar.

　　2. Production process:

　　Carrot → Cleaning → Segmentation (1cm3)→ Softening (4min)→ Adding thickener (0.8%, glycerol 3%)→ Beating → Degassing (10min)→ Homogeneous → Seasoning → Forming → Baking (60℃, 9h)→ end product

　　Edible packaging is the main trend of high-tech development in the world food industry, and it has a wide range of applications, such as casing, sugar coating, sticky rice paper and tablet coating. Edible packaging has various functions, is harmless to the environment, is convenient to obtain materials and can be eaten. Therefore, in recent years, the food industry is competing to develop and develop, and new products and technologies are constantly emerging.

Sodium alginate is used as the bottom material of hot pot for thickening.

What is sodium alginate analyzed by experts?

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