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An Automated Methylthymol Blue Method for Calcium Determination in Peanuts
Author(s) -
SALAZAR ARTURO J.,
YOUNG CLYDE T.
Publication year - 1984
Publication title -
journal of food science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 150
eISSN - 1750-3841
pISSN - 0022-1147
DOI - 10.1111/j.1365-2621.1984.tb13709.x
Subject(s) - trichloroacetic acid , chemistry , spectrophotometry , atomic absorption spectroscopy , magnesium , chromatography , calcium , organic chemistry , physics , quantum mechanics
An automated spectrophotometric procedure based on methylthymol blue methodology is adapted for the estimation of Ca in trichloroacetic acid (TCA) extracts from peanuts. Samples (20g of shelled cured peanuts) are ground in 200 mL of a 2% TCA solution for 1 min, filtered, and the filtrates analyzed at the rate of 60/hr by using a modified spectrophotometric technique. The results obtained by this procedure agreed with those obtained by atomic absorption spectrophotometry. The procedure described seems to be ideal for use in routine analysis of Ca concentration in peanuts ranging from 30‐100 mg Ca/100g of peanuts. High magnesium concentrations caused significant errors at lower Ca levels.