Monothioglycerol
(mon'' oh thye'' oh glis' er ol).
» Monothioglycerol contains not less than 97.0 percent and not more than 101.0 percent of C3H8O2S, calculated on the anhydrous basis.
Packaging and storage
Preserve in tight containers.
Specific gravity 841:
between 1.241 and 1.250.
Refractive index 831:
between 1.521 and 1.526.
pH 791:
between 3.5 and 7.0, in a solution (1 in 10).
Water, Method II 921:
not more than 5.0%.
Residue on ignition 281:
not more than 0.1%.
Selenium 291:
0.003%, a 200-µL test specimen being used.
Heavy metals, Method II 231:
0.002%.
Assay
Dissolve about 400 mg of Monothioglycerol, accurately weighed, in 50 mL of water, and titrate with 0.1 N iodine VS, adding 3 mL of starch TS as the endpoint is approached. Each mL of 0.1 N iodine is equivalent to 10.82 mg of C3H8O2S.
Auxiliary Information
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USP35NF30 Page 1872
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