Thermal properties of tannin extracted from Anacardium occidentale L. using TGA and FT-IR spectroscopy
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Updated: Apr 8, 2026

Estimation of Plant Biomass Lignin Content using Thioglycolic Acid TGA
Published on: July 24, 2021
Vinod Viswanath1,2, Vincent Vineeth Leo1, S Sabna Prabha1
1a Cashew Export Promotion Council Laboratory and Technical Division , Kollam , Kerala , India.
Abstract:
The chemical nature of the polyphenols of cashew kernel testa has been determined. Testa contains tannins, which present large molecular complexity and has an ancient use as tanning agents. The use of tannins extracted from cashew testa, considered in many places as a waste, grants an extra value to the cashew. In this work we have analysed through high performance liquid chromatography, infrared spectroscopy (FT-IR) and thermo gravimetric analysis the average molecular weight, main functional groups and thermal properties of tannins extracted from Anacardium occidentale L. The results of these analyses are compared with the commercial grade tannic acid. The FT-IR spectra showed bands characteristic of C = C, C-C and OH bonds. This important bioactive compound present in the cashew nut kernel testa was suggested as an interesting economical source of antioxidants for use in the food and nutraceutical industry.
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