Browsing by Author "Kucukgulmez A."

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Comparison of the physicochemical properties of chitosan extracted from shrimp shell waste with different deacetylation degrees
(2017-01-01) Kucukgulmez A.; Eslem Kadak A.; Celik L.; Farivar A.; Celik M.
In this study chitosan with different degrees of deacetylation have been extracted from deep sea pink shrimp (Parapenaeus longirostris) shells not evaluated and discarded as waste products to investigate the effect of deacetylation on physicochemical properties of chitosan. In order to determine physicochemical characterization of the chitosans; moisture and ash contents, degree of deacetylation, molecular weight, apparent viscosity, water and fat binding capacities, Fourier Transform Infrared Spectroscopy, Scanning Electron Microscopy and X-ray diffraction analyses were applied. In addition, the physicochemical characteristics of the chitosan extracted from P. longirostris shells were compared to the commercial chitosan. Low degree deacetylated chitosan exhibited a higher molecular weight, higher viscosity and higher water and fat binding capacities compared to the high degree deacetylated chitosan. Study findings are considered to be useful for the economic use of shrimp wastes in Turkey and light the way for future studies on other crustacean species.
The evaluation of shellfish wastes as antimicrobial agent on Rainbow trout
(2018-01-01) Kucukgulmez A.; Kadak A.; Celik M.; Yanar Y.; Gulnaz O.
This study aims to investigate antimicrobial effects of chitosan obtained from shell wastes of Metapenaeus stebbingi on refrigerated rainbow trout fillets. In the study, the fillets were dipped with different concentrations (0.1%, 0.5%, 1%) of extracted and commercial chitosan and were packed with vacuum and air conditions and subsequently, changes in total bacteria were observed during refrigerated storage period (4±1°C). There were decreases in the number of microorganisms of both groups plunged in natural and commercial chitosan during 12 days of storage compared to control group, and the best results was obtained as 0.1% in the groups applied with natural and commercial chitosan (p<0.05). In conclusion, chitosan obtained from shell wastes of M. stebbingi could be used as an effective natural alternative to synthetic antimicrobial agents during the storage period of fish.