Polysorbate

Synonyms: polyoxyethylene 20 sorbitan mono-oleate
cas number: 9005-65-6, molecular weight: 2917, chemical formula: c64h124o26, einecs ec number: 500-019-9, fema: 2917,
polysorbate 80 bp grade
polyoxyethylene 20 sorbitan mono-oleate
ph eur
action and use: non-ionic surfactants.
Definition
mixture of partial esters of fatty acids, mainly oleic acid (0799), with sorbitol and its anhydrides ethoxylated with approximately 20 moles of ethylene oxide for each mole of sorbitol and sorbitol anhydrides.
Characters
appearance: oily, yellowish or brownish-yellow, clear or slightly opalescent liquid.
Solubility: dispersible in water, in anhydrous ethanol, in ethyl acetate and in methanol, practically insoluble in fatty oils and in liquid paraffin.
Relative density: about 1.10.
Viscosity: about 400 mpaâ·s at 25c.
Identification
first identification a, d.
Second identification b, c, d, e.
A. Infrared absorption spectrophotometry.
B. Hydroxyl value (see tests).
C. Saponification value (see tests).
D. Composition of fatty acids.
E. Dissolve 0.1 g in 5 ml of methylene chloride r. Add 0.1 g of potassium thiocyanate r and 0.1 g of cobalt nitrate r. Stir with a glass rod. The solution becomes blue.
Tests
acid value: maximum 2.0.
Hydroxyl value: 65 to 80.
Peroxide value: maximum 10.0.
Saponification value: 45 to 55, determined on 4.0 g.
Composition of fatty acids: to pass the test.
Ethylene oxide and dioxan: maximum 1 ppm of ethylene oxide and maximum 10 ppm of dioxan.
Heavy metals: maximum 10 ppm.
Water: maximum 3.0 per cent, determined on 1.00 g.
Total ash: maximum 0.25 per cent, determined on 2.0 g.