Transformation's kinetic reaction of organic acids during the cold storage of Tangor (Ortanique)

UDC 634.3

Transformation's kinetic reaction of organic acids during the cold storage of Tangor (Ortanique)

Kolodyazna V.S., Boulkrane M.S.


Abstract
Both maximum preservation of biological value and minimizing damage from physiological and infectious  diseases are of great importance for long-term storage of citrus fruits being imported into Russia from subtropical countries. Tangor (Ortanique) fruits are of great biologically active substances content, with organic acids referred to as parapharmaceuticals being among them. Organic acids are subjected to oxidation-reduction reaction during storage, speed of reaction depending on type of fruits, the temperature and time of storage. In this paper composition and kinetics of changes in the organic acid content during storage at low positive temperatures are analyzed by      gas-liquid chromatography and mass spectrometry for the first time. Ortanique fruits from Algeria have been chosen as the material for experiments. 18 organic acids have been identified in the fruits, citric, malic, quinic и gluconic ones being the predominant. The total content of organic acids is shown to decrease by 29% during 60 day storage. The citric, oxalic, and galacturonic and citraconic acids are shown to have maximum rate of conversion, with benzoic, erythric and quinic acids having the minimum one.

Keywords: Tangor (Ortanique) citrus fruits, organic acids, cold storage, oxidizing kinetic.


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