Effect of irradiation on total biophenol and antioxidant activity
quantity during storage of natural black table olives obtained using
starter culture
Abstract
In this study, It was aimed to determine the effects of different
production and preservation methods on the shelf life and quality of the
Gemlik variety natural black table olives produced with low salt (2%).
For this purpose the olives processed with traditional Turkis turning
black olive using starter culture The MAP (Modified athmosphere
packaging), vacuum and gamma irradiation method (1, 3 and 5 kGy) was
applied for the first time in the preservation of table olives. The
reducing effect of 5 kGy dose on total phenolic substance and DPPH
antioxidant activity was found to be higher than other doses. During
storage, pH (4.30-4.83) and titratable acidity (0.68-1.02%) values of
black table olives changed in normal course. At the and of the
fermentation and storage, total phenolic substance and DPPH antioxidant
activity decreased and were found statistically significant
(p<0.01). During the storage period, the total amount of
phenolic matter in olives in normal production (without starter culture)
decreased from 232 to 144 mgCAE/100g and in starter culture added table
olives from 200 to 138 mgCAE/100g. As a result of the study, it was
ensured that table black olives produced with less salt (2%) could be
stored on the shelves for at least 6 months without using any
preservatives. In addition, radiation effect on quality was relatively
similar to other applications.