DIETHYL TARTRATE-酒石酸二乙酯
DIETHYL TARTRATE
Prepared at the 29th JECFA (1985), published in FNP 34 (1986) and in
FNP 52 (1992). Metals and arsenic specifications revised at the 63rd
JECFA (2004). No ADI was allocated at the 25th JECFA (1981)
SYNONYMS Ethyl tartrate, Diethyl...
DIETHYL TARTRATE
Prepared at the 29th JECFA (1985), published in FNP 34 (1986) and in
FNP 52 (1992). Metals and arsenic specifications revised at the 63rd
JECFA (2004). No ADI was allocated at the 25th JECFA (1981)
SYNONYMS Ethyl tartrate, Diethyl L(+)-tartrate
DEFINITION
Chemical names Diethyl L(+)-tartrate, 2,3-dihydroxy-[R-(R*,R*)]-butanedioic acid diethyl ester
C.A.S. number 87-91-2
Chemical formula C8H14O6
Structural formula
Formula weight 206.18
Assay Not less than 99.0%
DESCRIPTION Colourless, thick, oily liquid, with a faint, wine-like odour
FUNCTIONAL USES Carrier solvent, flavouring agent (see "Flavouring agents" monograph,
JECFA No. 622)
CHARACTERISTICS
IDENTIFICATION
Solubility (Vol. 4)
Slightly soluble in water; soluble in fixed oils, ethanol, ether
Refractive index (Vol. 4)
n (20, D): about 1.448
Specific gravity (Vol. 4)
d (20, 4): 1.204 - 1.207
PURITY
Specific rotation (Vol. 4)
[alpha] 20, D: Between + 7.5 and + 8.5o
Acid value (Vol. 4)
Not more than 1
Sulfated ash (Vol. 4)
Not more than 0.05%
Test 1 g of the sample (Method II)
Lead (Vol. 4) Not more than 2 mg/kg
Determine using an atomic absorption technique appropriate to the
specified level. The selection of sample size and method of sample
preparation may be based on the principles of the method described in
Volume 4, “Instrumental Methods.”
METHOD OF
ASSAY
Weigh accurately about 1.0 g of the sample and transfer it into a 125-ml
Erlenmeyer flask containing a few boiling stones. Add to this flask, and,
simultaneously, to a similar flask for a residual blank titration 25.0 ml of 0.5
N ethanolic potassium hydroxide. Connect each flask to a reflux condenser,
and reflux the mixtures on a steam bath for exactly 1 h. Allow the mixtures
to cool, add 10 drops of phenolphthalein TS to each flask, and titrate the
excess alkali in each flask with 0.5 N hydrochloric acid. Calculate the
percent of diethyl tartrate in the sample by the formula:
where
b = the number of ml of 0.5 N hydrochloric acid consumed in the residual
blank titration
S = the number of ml of 0.5 N hydrochloric acid consumed in the titration of
the sample
W = the weight (mg) of the sample
DIETHYL TARTRATE
SYNONYMS
DEFINITION
Chemical names
C.A.S. number
Chemical formula
Structural formula
Formula weight
Assay
DESCRIPTION
FUNCTIONAL USES
IDENTIFICATION
PURITY
Lead (Vol. 4)
METHOD OF ASSAY
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