Bibliographic citations
Chan, J., (2015). Eficacia antioxidante de los compuestos fenológicos de la mashua (Tropaeolum tuberosum) en la estabilidad del aceite de linaza (Linum usitatissimum L.) [Tesis, Universidad Nacional Agraria La Molina]. https://hdl.handle.net/20.500.12996/1791
Chan, J., Eficacia antioxidante de los compuestos fenológicos de la mashua (Tropaeolum tuberosum) en la estabilidad del aceite de linaza (Linum usitatissimum L.) [Tesis]. : Universidad Nacional Agraria La Molina; 2015. https://hdl.handle.net/20.500.12996/1791
@misc{sunedu/3012372,
title = "Eficacia antioxidante de los compuestos fenológicos de la mashua (Tropaeolum tuberosum) en la estabilidad del aceite de linaza (Linum usitatissimum L.)",
author = "Chan Moromisato, Jordan Paolo",
publisher = "Universidad Nacional Agraria La Molina",
year = "2015"
}
In the present study the antioxidant effectiveness of phenolic extract from purple tuber mashua (Tropaeolum tuberosum) in linseed (Linum usitatissimum L.) was evaluated. To obtain the extract from lyophilized mashua, a methanol:acetone:water (45:45:10 v/v/v) mix acidified with 0.15 % of concentrated hydrochloric acid was used as solvent. Fractionation of the extract with ethyl acetate (extract:ethyl acetate, 1:2 v/v) was then performed to yield two phases, aqueous and ethyl acetate to which were evaluated for phenolic content and ABTS antioxidant capacity. Due to the good solubility of the ethyl acetate fraction in the oil, it was added to the linseed oil and differential scanning calorimetry at 120 °C and accelerated storage at 55 °C for 15 days were performed, to assess the antioxidant efficacy of this fraction. In both tests a negative blank (no antioxidant added oil) and a positive blank with BHT at 200 ppm were used. In differential scanning calorimetry, concentrations of phenolic compounds of 60, 120, 240 and 360 ppm were used; the concentrations of 240 and 360 ppm were the most efficient, presenting greater induction times. In accelerated storage test, the concentration of 240 ppm was used and the peroxide value, conjugated diene, p-anisidine index and fatty acids profile by gas chromatography were analyzed. It was found that the phenolic compounds at 240 ppm and 200 ppm BHT offered linseed oil protection substantially similar to the primary oxidation; however, the first offered better protection against secondary oxidation. On the other hand, by gas chromatography, it was found that the fatty acid involved in oxidation reactions was linolenic acid. The results conclude that the phenolic compounds soluble in ethyl acetate mashua can be considered good antioxidants in linseed oil.
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