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2003•INDIAN JOURNAL OF CHEMISTRY- SECTION ARequires access

Thenoyltrifluoroacetone as a spectrophotometric reagent for determination of ascorbic acid

Satya Prakash Arya, Preeti Jain

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Abstract

An extractive spectrophotometric method for the determination of microamounts of ascorbic acid is described. I-[Thenoyl- (2')-3,3,3-trifluoro-acetone] (HTTA) is found to react with iron (III) in strongly acidic medium giving a red coloured complex. The method is based on the proportionate decrease in the colour intensity of Fe(III)-HTTA complex with the addition of ascorbic acid at 405 nm. Linear calibration curve is observed in the range 1.0-5.0 H g/mL of ascorbic acid. The molar absorptivity and Sandell's sensitivity are 5.3x10 4 L/mot/cm and o.003pg/cm 2 , respectively. The interference of sugars, vitamins, amino acids, mineral salts, sweetening agents etc. has been studied. The method is successfully used in the determination of ascorbic acid in pure vitamin C tablets, drops and multivitamin products.

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What this paper is about

An extractive spectrophotometric method for the determination of microamounts of ascorbic acid is described. I-[Thenoyl- (2')-3,3,3-trifluoro-acetone] (HTTA) is found to react with iron (III) in strongly acidic medium giving a red coloured complex. The method is based on the proportionate decrease in the colour intensity of Fe(III)-HTTA complex with the addition of ascorbic acid at 405 nm. Linear calibration curve is observed in the range 1.0-5.0 H g/mL of ascorbic acid. The molar absorptivity and Sandell's sensitivity are 5.3x10 4 L/mot/cm and o.003pg/cm 2 , respectively. The interference of sugars, vitamins, amino acids, mineral salts, sweetening agents etc. has been studied. The method is successfully used in the determination of ascorbic acid in pure vitamin C tablets, drops and multivitamin products.

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Available abstract

An extractive spectrophotometric method for the determination of microamounts of ascorbic acid is described. I-[Thenoyl- (2')-3,3,3-trifluoro-acetone] (HTTA) is found to react with iron (III) in strongly acidic medium giving a red coloured complex. The method is based on the proportionate decrease in the colour intensity of Fe(III)-HTTA complex with the addition of ascorbic acid at 405 nm. Linear calibration curve is observed in the range 1.0-5.0 H g/mL of ascorbic acid. The molar absorptivity and Sandell's sensitivity are 5.3x10 4 L/mot/cm and o.003pg/cm 2 , respectively. The interference of sugars, vitamins, amino acids, mineral salts, sweetening agents etc. has been studied. The method is successfully used in the determination of ascorbic acid in pure vitamin C tablets, drops and multivitamin products.

Key concepts: Ascorbic acid, Chemistry, Molar absorptivity, Calibration curve, Reagent, Chromatography, Nuclear chemistry, Vitamin

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