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Storage stability of Jatropha curcas L. oil naturally rich in gamma-tocopherol
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Orientador(es)
Resumo(s)
Jatropha curcas L. is an interesting tropical oil crop for biodiesel production. However, seed conservation
until oil extraction may be a problem under high temperature and humidity. In this study, Jatropha curcas
L. seeds grown in Mozambique and presenting 160 mg/kg of gamma-tocopherol in their oil were stored
for 42 days, in dark, at 35 ◦C and 75% or 92% relative humidity (RH). Along storage, the oil was extracted
and analysed in terms of fatty acid composition, tocopherol content, acidity, initial and final oxidation
products (monitored by K232 and K270 values, respectively).
Jatropha seeds presented an initial water content of 8.4% and an oil content of 45.7% (dry basis). The
oil was rich in oleic (41.2%) and linoleic (38.8%) acids.
Along 42 days of storage, the acidity increased from 0.8% to 7.4% and 25.3% and K270 increased from
0.07 to 0.25 and 0.46 in oils from seeds stored at 75% and 92% RH, respectively. Simultaneously, a decrease
in gamma-tocopherol content was observed, which was more pronounced at 92% RH than at 75% RH (96%
decrease versus 57% decrease). Gamma-tocopherol showed to protectthe oil against oxidation principally
during the second stage of oxidation. During the storage at 35 ◦C, the fatty acid composition of the oils
from seeds kept either at 75% or 92% of humidity, did not significantly vary throughout the test
Descrição
Palavras-chave
Gamma-tocophero Jatropha curcas L. Oil Seeds Stability
Contexto Educativo
Citação
Joana Rodrigues, Isabel Miranda, Leonnardo Furquim, Jorge Gominho, Manuel Vasconcelos, Gonçalo Barradas, Helena Pereira, Fernando Bianchi-de-Aguiar, Suzana Ferreira-Dias, Storage stability of Jatropha curcas L. oil naturally rich in gamma-tocopherol, Industrial Crops and Products, Volume 64, 2015, Pages 188-193, ISSN 0926-6690,