Mehmet Seckin Aday

Role of Ozone Concentrations and Exposure Times in Extending Shelf Life of Strawberry

Efficiency of three aqueous ozone concentrations (0.075 ppm, 0.15 ppm, 0.25 ppm) and two exposure times (2 and 5 min) were investigated for maintaining strawberry quality. Exposure to 0.075 ppm and 0.15 ppm ozone delayed the changes in pH, total soluble solids, firmness and electrical conductivity. All ozone treatments prevented mold growth during storage. However, the 0.25 ppm ozone treatment caused loss of strawberry quality due to high ozone concentration. The results have shown that; low (0.075 ppm) and middle (0.15 ppm) ozone concentrations can be applied to extend the shelf-life of strawberries by at least 3 weeks under refrigerated conditions.

Assessing consumers’ adoption of active and intelligent packaging

Purpose – The purpose of this paper is to identify the purchase behavior with regard to innovative food packaging techniques and sociodemographic properties of consumers in Turkey (the crossroads of Europe and Asia). Design/methodology/approach – The survey was conducted with 365 people (around 50 persons for each region) who live in the different regions to represent the whole population of Turkey as good as possible. Questionnaire methodology was used to achieve the research objectives. Multiple-choice test which consists of 24 questions (Table I) were selected in order to keep the questionnaire at a reasonable length. Questionnaires were distributed to the respondents in small groups for effective communication. Multiple correspondence, decision tree and prospect profiles statistic procedures were used to identify the purchase behavior. Findings – In the study, some consumers worried that innovative packages might mislead them and therefore sales should be handled under trusted brands. Majority of cons...

Ozone treatment of shell eggs to preserve functional quality and enhance shelf life during storage.

BACKROUND Eggs have long been recognised as a source of high-quality proteins. Many methods exist to extend shelf life of food and one of them is ozone treatment, which is an emerging technology for disinfecting surfaces in the food industry. This study aimed to extend the shelf life of fresh eggs using gaseous ozone treatments at concentrations of 2, 4 and 6 ppm with exposure times of 2 and 5 min during storage for 6 weeks at 24 °C. The effect of the treatments on interior quality and functional properties of eggs is also reported. RESULTS Ozone concentration and exposure time significantly affected the Haugh unit (HU), yolk index, albumen pH, relative whipping capacity (RWC), and albumen viscosity of eggs during the storage. Control eggs had the highest albumen pH and lowest albumen viscosity. Attributes such as albumen pH and RWC of eggs exposed to ozone treatments were better than the control samples. The measurement results showed that ozone concentration at 6 ppm and exposure time of 5 min can be applied to fresh eggs and extend shelf life up to 6 weeks at 24 °C storage period. CONCLUSION Ozone treatments helped to maintain egg quality for a longer time. Ozone concentrations at 2 and 4 ppm showed promising results in maintaining internal quality and functional properties of fresh eggs during storage. Ozone at high concentration (6 ppm) caused a detrimental effect on eggshell quality. As a result, this study demonstrated that ozone treatments of 2, and especially 4 and 6 ppm concentration maintained eggshell quality during the storage.