Bibliographic citations
Santayana, M., (2018). Efecto del estrés abiótico post-cosecha en la síntesis de metabolitos secundarios y capacidad antioxidante de mashua morada (Tropaeolum tuberosum) [Tesis, Universidad Nacional Agraria La Molina]. https://hdl.handle.net/20.500.12996/3775
Santayana, M., Efecto del estrés abiótico post-cosecha en la síntesis de metabolitos secundarios y capacidad antioxidante de mashua morada (Tropaeolum tuberosum) [Tesis]. : Universidad Nacional Agraria La Molina; 2018. https://hdl.handle.net/20.500.12996/3775
@mastersthesis{renati/242998,
title = "Efecto del estrés abiótico post-cosecha en la síntesis de metabolitos secundarios y capacidad antioxidante de mashua morada (Tropaeolum tuberosum)",
author = "Santayana Rivera, Mónica Lucía",
publisher = "Universidad Nacional Agraria La Molina",
year = "2018"
}
Mashua, Tropaeolum tuberosum, is an Andean crop that produces tubers with a high content of phenolic compunds and glucosinolates. The synthesis of these secondary metabolites is highly affected by abiotic stress during its vegetative phase and post harvest manipulation. Thus it is important to characterize its effect on the synthesys of phenolic compounds to increase the functional qualities of mashua tubers. In this thesis mashua tubers (ARB5241 genotype) were subjected to three abiotic stress types: sunny, refrigerated and shade. Each three days during fifteen days the total phenolic content (CFT), total anthocyanins (ACYT), hydrophilic antioxidant capacity (HAC) and the phenolic and anthocyanin profiles through UPLC®-PDA were evaluated. The highest values of CFT and ACYT were at 12 days of the shade treatment with 14,9 mg gallic acid equivalent (AGE)·g ms-1 and 3,7 mg delphinidin 3-glucoside equivalent (DGE)·g ms-1, respectively. The highest values for HAC were at 12 days of shade treatment with 215,3 μmol TE·g ms-1 and at 3 days of refrigerated treatment with 256,4 μmol TE·g ms-1for ORAC and ABTS, respectively. In the sunny treatment, CFT descreased after the third day of treatmente and ACYT decreased from the first day, reaching 3,5 mg AGE·g ms-1 and 0,29 mg DGE·g ms-1 respectively. Among the non-anthocyanin phenolic compunds, gallic acid was identified by UPLC® and flavanols, flavonols, cinnamic acid and hydroxybenzoic acid derivatives were detected. Among anthocyanins, delphinidine 3-glucoside was identified and delphinidin, cyanidin and pelargonidin derivatives were detected. The HAC correlated strongly with the content of ACYT for the sunny and shade treatments in a negative and positive way respectively, indicating that the evolution of these compounds directly affect the antioxidant capacity of the mashua tubers.
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