Main content area

Effect of chitosan coatings with and without Stevia rebaudiana and modified atmosphere packaging on quality of cold stored fresh-cut apples

Karagöz, Şeyda, Demirdöven, Aslıhan
Lebensmittel-Wissenschaft + [i.e. und] Technologie 2019 v.108 pp. 332-337
Stevia rebaudiana, antioxidant activity, antioxidants, apples, ascorbic acid, catechol oxidase, chitosan, coatings, cold, edible films, fresh-cut produce, glycerol, microbial load, microbiological quality, modified atmosphere packaging, pH
In this study, it was aimed to investigate the changes in polyphenoloxidase (PPO) activity, antioxidant properties and microbiological quality of fresh-cut apple slices coated with chitosan and stevia combinations under MAP (polypropylene-PP, 30 μm) storage at +1 °C for 3 days. The apples were cube-shaped and divided into three samples: i-Control (C, without coating), ii-Chitosan (CH, dipped into film mixture consisting of 0.75% chitosan, 1.5% glycerol and 2% ascorbic acid) and iii-Chitosan-Stevia combination (CHS, same CH film contains 2.5% stevia extract). PPO activity and microbiological (total yeast& mold-TYM and total psychrophilic aerobic bacteria-TPAB, total mesophilic aerobic bacteria-TMAB), total phenolic, antioxidant capacity, O2-CO2% and pH analyzes were performed. Results showed that PPO activity, O2-CO2% and pH values were lower, antioxidant substances were higher than C sample. At the end of the storage, CHS samples showed high PPO activity and antioxidant capacity values compared to CH. TMAB was found in C sample but it was under detectable limit (<2) during storage in CH and CHS samples; TPAB was found under detectable limit (<2) in all samples. Additionally, the chitosan and stevia have reduced the TYM counts. As conclusion; CH and CHS edible films are effective applications for reducing PPO activity and microbial load.