Sodium Benzoate

  1. DESCRIPTION
CAS Registry No.: 532-32-1
Molecular Formula: C7H5O2Na
Molecular Weight: 144.105 g/mol
Structural Formula:  

 

 

Synonyms: Benzoic acid, sodium salt

 

  1. SPECIFICATIONS

Physical Property

Appearance white or colorless crystalline powder
Odor odorless
Density 1.497 g/cm3
Melting point 410 °C (770 °F; 683 K)
 

Solubility in water

62.69 g/100 mL (0 °C)
62.78 g/100 mL (15 °C)
62.87 g/100 mL (30 °C)
71.11 g/100 mL (100 °C)
Solubility soluble in liquidammonia, pyridine
Solubility inmethanol 8.22 g/100 g (15 °C)
7.55 g/100 g (66.2 °C)
Solubility inethanol 2.3 g/100 g (25 °C)
8.3 g/100 g (78 °C)
Solubility in1,4-Dioxane 0.818 mg/kg (25 °C)

 

Technical Data

Item Specification
Appearance White, almost odorless crystalline powder
Identification  
Benzoates Positive
Sodium Positive
Appearance of solution  
Clarity Clear
Color Y6
Assay ,% 99.0-100.5
Acidity or alkalinity (ml/g) 0.2 Max
Halogated compounds  
Ionised chlorine, ppm 200Max
Total chlorine, ppm 300Max
Heavy metals ,Pb (ppm) 10 Max
Readily oxidisable substance Passed
Polycyclic acids Positive
Loss on drying, % 2.0 Max

 

  1. PACKAGING

Standard packaging: 25kg/bag, inner is PE film bag, outer bag is PP film bag.

Available special request

 

  1. STORAGE

It shall be stored in a well-ventilated, cool and dry place which is out of direct sunlight. Keep containers tightly closed when not in use.

 

  1. PERIOD OF VALIDITY

24 months

 

  1. APPLICATIONS

Sodium benzoate is an acidic preservative and has no bactericidal and bacteriostatic action in alkaline media. The optimal pH for its preservation is 2.5-4.0. The bactericidal effect of a 5% solution at pH 5.0 is not very good. Sodium benzoate is more lipophilic and easily penetrates the cell membrane into the cell body, interfering with the permeability of the cell membrane, inhibiting the absorption of amino acids by the cell membrane, entering the alkaline reservoir of the ionized acidified cells within the cell body, and inhibiting the activity of the cell’s respiratory enzyme system, Blocks the acetyl-CoA condensation reaction and thus serves the purpose of food preservation.