ZINC CITRATE

ZINC CITRATE
PRODUCT IDENTIFICATION
CAS NO.	546-46-3 (Anhydrous) 5990-32-9 (Dihydrate)
EINECS NO.	208-901-2
FORMULA	[OOCCH₂C(OH)(COO)CH₂COO]₂Zn₃
MOL WT.	574.37
H.S. CODE	2918.16
TOXICITY	Oral rat LD50: > 5,000 mg/kg
SYNONYMS	2-hydroxy-1,2,3-Propanetricarboxylic acid, zinc salt;
SMILES
CLASSIFICATION
PHYSICAL AND CHEMICAL PROPERTIES
PHYSICAL STATE	White to yellow powder
MELTING POINT	334 C
BOILING POINT
SPECIFIC GRAVITY
SOLUBILITY IN WATER	100 g/l
pH
VAPOR DENSITY
AUTOIGNITION
NFPA RATINGS
REFRACTIVE INDEX
FLASH POINT
STABILITY	Stable under ordinary conditions
APPLICATIONS
Zinc is an essential mineral having a role in the maintenance of the body's nervous and immune systems (T-cell function). This mineral is involved in the biochemical reactions as an antioxidant in the healing process and develops normal tissues Zinc is a cofactor in enzymatic reactions such as protein synthesis polymerases and in carbonic acid anhydrase. Zinc maintains the body's alkaline balance. Zinc finger, a structural domain found in many gene-regulatory proteins, is a component of hydrophobic hormones acting stabilizing the biomembrane structures and cell membrane metabolism. Zinc deficiencies may result in prolonged wound healing, delayed sexual maturation, mental lethargy, skin changes, and susceptibility to infections. Gluconate and citrate forms are mainly used as zinc supplements. They are easily absorbed by the body. Zinc citrate can be formulated in pharmaceuticals, and foods as a zinc supplement. Zinc citrate is used as an ingredient to treat common cold and various hygienic products. Zinc inhibits the growth of bacteria in the throat and can be used in toothpaste.
SALES SPECIFICATION
APPEARANCE	White to yellow powder
CONTENT	96.0% min
IDENTIFICATION	Positive (Test A, B)
ZINC CONTENT	31.0% (Dihydrate) - 34.0% (Anhydrate)(
SULFATE	0.05% max
LOSS ON DRYING	3.0% max
CADMIUM	5ppm max
CHLORIDE	0.05% max
LEAD	10ppm max
ARSENIC	3ppm max
TRANSPORTATION
PACKING	25kgs in fiber drum
HAZARD CLASS	not regulated
UN NO.
GENERAL DESCRIPTION OF CITRIC ACID
Citric Acid (2-Hydroxy-1,2,3-propanetricarboxylic acid, in IUPAC naming) is a colourless crystalline organic compound belong to carboxylic acid family. It exists in all plants (especially in lemons and limes) and in many animal tissues and fluids. In biochemistry, it is involved in important metabolism of almost all living things; the Krebs cycle (also called citric acid cycle or tricarboxylic acid cycle), a part of the process by which animals convert food to energy. Citric acid works as a preservative ( or as an antioxidant) and cleaning agent in nature. It is commercially obtained by fermentation process of glucose with the aid of the mold Aspergillus niger and can be obtained synthetically from acetone or glycerol. It can be used as an sour taste enhancer in foods and soft drinks. The three carboxy groups lose protons in solution; resulting in the excellent pH control as a buffer in acidic solutions. It is used as a flavouring, stabilizing agent and acidulant (to control acidity) in food industry, in metal-cleaning compositions as it chelates metals. Citric acid is available in forms of anhydrous primarily and in monohydrate, the crystallized form from water. The hydrated form will be converted to the anhydrous form above 74 C. Citrate is a salt or ester of citric acid. Citrates are formed by replacing the acidic one, two, or all three of the carboxylic hydrogens in citric acid by metals or organic radicals to produce an extensive series of salts, esters, and mixed (double) salts. Cirrates are used in food, cosmetics, pharmaceutical and medicine industries as well as in plastic industry; nutrient or food additives having functions of acidity regulator, sequestering and stabilizing agent, antioxidants synergist, firming agent; anticoagulant for stored whole blood and red cells and also for blood specimens as citrates chelate metal ions and saline cathartics, effervescent medicines; high boiling solvent, plasticizer and resin for food contact plastics.