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- W2052629562 abstract "Vibrational spectroscopy (Raman, FT-IR-ATR) has been applied for the first time to the study of the mechanism of chilling stress and the monitoring of the best operative conditions for cold storage of fruit. In particular, this work deals with some results of the application of vibrational spectroscopy to the molecular characterization of lipidic extracts of fruits (apples and pears, pulp and peel) stored at low temperatures. The results have been obtained in a cooperative interdisciplinary research project performing experiments on fruits for one year cycles under different storage conditions of temperature (0°C, 8°C) and atmosphere (normal, controlled). The Raman spectra, useful for the evaluation of the transition temperature and the cooperative effect in the fruit membrane lipids, were masked by the strong resonance spectrum of carotenoids. The lipid unsaturation, the natural response to cold storage, was evaluated in the FT-IR-ATR spectra and expressed as the “total” unsaturation degree R = I3012 cm−12858 cm−1. The results on pulp and peel lipids have shown that the R value, higher in the pulps than peels, is dependent on the storage temperature and time. The increase in R is correlated with the higher fruit resistance to the chilling stress. Furthermore, the FT-IR spectra of the outer part of the fruits stored at 8°C show modifications of the carbonylic band at 1738 cm−1 (esteric group) such as the appearance of two other bands at 1715 and 1700 cm−1 increasing in intensity with storage time. These new components can be considered as molecular markers of the onset of a hydrolysis reaction and also of a partial peroxidation of the acylic unsaturated chains." @default.
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- W2052629562 date "1994-07-01" @default.
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- W2052629562 title "Vibrational spectroscopy for the evaluation of molecular perturbations induced in fruit lipids by cold storage" @default.
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- W2052629562 doi "https://doi.org/10.1016/0022-2860(94)08238-3" @default.
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