title: Thermal properties of tannin extracted from Anacardium occidentale L. using TGA and FT-IR spectroscopy.
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.
authors.affiliation: a Cashew Export Promotion Council Laboratory and Technical Division , Kollam , Kerala , India.|b School of Bioscience, Mahatma Gandhi University , Kottayam , Kerala , India.
authors.forename: Vinod
authors.initials: V
authors.lastname: Viswanath
authors.affiliation: a Cashew Export Promotion Council Laboratory and Technical Division , Kollam , Kerala , India.
authors.forename: Vincent Vineeth
authors.initials: VV
authors.lastname: Leo
authors.affiliation: a Cashew Export Promotion Council Laboratory and Technical Division , Kollam , Kerala , India.
authors.forename: S Sabna
authors.initials: SS
authors.lastname: Prabha
authors.affiliation: a Cashew Export Promotion Council Laboratory and Technical Division , Kollam , Kerala , India.
authors.forename: C
authors.initials: C
authors.lastname: Prabhakumari
authors.affiliation: a Cashew Export Promotion Council Laboratory and Technical Division , Kollam , Kerala , India.
authors.forename: V P
authors.initials: VP
authors.lastname: Potty
authors.affiliation: b School of Bioscience, Mahatma Gandhi University , Kottayam , Kerala , India.
authors.forename: M S
authors.initials: MS
authors.lastname: Jisha
mesh_terms: D031021:Anacardium / Q000737:chemistry*; D002851:Chromatography, High Pressure Liquid; D019649:Food Industry; D008970:Molecular Weight; D009754:Nuts / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013634:Tannins / Q000737:chemistry* / Q000302:isolation & purification*; D013818:Thermogravimetry; D014866:Waste Products / Q000032:analysis
chemical_list: D013634:Tannins; D014866:Waste Products
keywords: Anacardium occidentale L; FT-IR; HPLC; TGA; cashew testa; tannic acid