Characteristics and uses of sodium citrate CAS NO.6132-04-3

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In daily life, sodium citrate appears in the raw materials of all kinds of goods around us. How many people have known about it Are we all clear about its functions, characteristics and uses Let's take a look at some secrets about it.

Sodium citrate is the most important citrate at present. It is mainly produced by the fermentation of starch substances to produce citric acid, and then neutralized with alkali substances. It has the following excellent properties:

(1) Safe and non-toxic performance. Since the raw material for preparing sodium citrate basically comes from grain, it is absolutely safe and reliable and will not harm human health. The food and Agriculture Organization of the United Nations and the world health organization do not impose any restrictions on their daily intake, which can be considered as non-toxic.

(2) Biodegradable. After being diluted by a large amount of water in nature, sodium citrate partially becomes citric acid, and the two coexist in the same system. Citric acid is easily biodegradable in water by the action of oxygen, heat, light, bacteria and microorganisms. Its decomposition pathway is generally through aconitic acid, itaconic acid and citric anhydride, which are transformed into carbon dioxide and water.

(3) It has the ability of metal ion complexation. Sodium citrate has good complexation ability to Ca2 +, Mg2 + and other metal ions, and also has good complexation ability to other metal ions, such as Fe2 + plasma.

(4) Excellent solubility, and the solubility increases with the increase of water temperature.

(5) It has good pH regulation and buffer performance. Sodium citrate is a weak acid and strong alkali salt. It can form a strong pH buffer when combined with citric acid. Therefore, it is of great use in some occasions that are not suitable for a wide range of pH changes. In addition, sodium citrate also has excellent retarding performance and stability.

The application of sodium citrate can be roughly divided into three categories:

1. Food application: sodium citrate is used in cool drinks to ease the sour taste and improve the taste. The addition of this product in brewing can promote saccharification, with an amount of about 0.3%. In the manufacture of ice cream and ice cream, sodium citrate can be used as emulsifier and stabilizer, with an amount of 0.2% ~ 0.3%. It can also be used as an anti rancidity agent for dairy products, a tackifier for processed cheese and fish products, as well as a sweetener for food.

Sodium citrate is non-toxic, has pH regulation performance and good stability, so it can be used in food industry. Sodium citrate is used as food additive with the largest demand. It is mainly used as seasoning agent, buffer, emulsifier, expander, stabilizer and preservative; In addition, sodium citrate is compatible with citric acid and can be used as gelling agent, nutritional supplement and flavor agent for various jams, jellies, fruit juices, beverages, cold drinks, dairy products and cakes.

2. Medical application: in medicine, sodium citrate is also widely used. The soluble complex formed by citrate and calcium ion can be used as anticoagulant and blood transfusion agent to preserve and process blood products. As a preservative, sodium citrate is used to preserve drugs such as syrup. Sodium citrate injection, like potassium salt, is used to correct the acidity of blood, body fluid and urine as diuretics, expectorants, etc. Sodium citrate combined with other reagents can be used to extract and purify animal liver RNA.

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