Fructo-oligosaccharides in table grapes and response to storage
María Blanch, María T. Sanchez-Ballesta, María I. Escribano and Carmen Merodio
Food Chemistry, Volume 129, Issue 3, 1 December 2011, Pages 724–730
2011
บทคัดย่อ
Fructo-oligosaccharides (FOS) have been recognized as health food ingredients with a protective effect against environmental stresses in plants. We have analyzed the profiles of individual FOS in Cardinal tablegrape pulp, until now undetected, and quantified their changes in response to low temperature and high CO2 levels. FOS separation and quantification was carried out using anion-exchange chromatography with pulsed amperometric detection (HPAEC-PAD), and the glucose, fructose and sucrose content of the grapes was also determined. Five FOS were identified and quantified: 1-kestose, neokestose, nystose, nystose b and kestopentaose. While in non-treated tablegrapes the endogenous FOS remained at steady state levels during storage at 0 °C, exposure to 20% CO2 for 3 days significant increases the levels of 1-kestose and kestopentaose, members of the inulin series. Considering the competitive advantage afforded by CO2-treated grapes, this transitory FOS accumulation could provide protection against damage caused by low temperature storage.