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RISS 인기검색어
- 검색키워드
- 저자 : Ismet Ozturk (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Ozturk, Ismet,Sagdic, Osman,Yetim, Hasan Korean Society for Food Science of Animal Resource 2021 한국축산식품학회지 Vol.41 No.2
The objective of this study was to determine the effects of yeast cultures (Candida zeylanoides and Debaryomyces hansenii) isolated from traditionally dry fermented Turkish sucuks, on some physicochemical and microbiological properties of the product. Eight different batches of the sucuks were produced by the inoculation of yeast and lactic acid bacteria (LAB) cultures (Lactobacillus curvatus, Lactobacillus plantarum and Lactobacillus sakei) in different combinations. The sucuks were ripened for 12 days and analyzed at 1st, 6th, and 12th days of ripening. Percent moisture content, pH, water activity (aw) and residual nitrite values of the sucuk inoculated with the yeast cultures were higher at the end of the ripening. The use of yeast cultures decreased hardness, gumminess, and chewiness values of the sucuk while increased adhesiveness values. Major volatile groups were aldehydes, terpenes, and sulphur compounds in the sucuk samples. The most noticeable results were for sensory properties of the sucuk that were positively improved by the yeast cultures.
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Effect of Gamma-Irradiation on Some Chemical Characteristics and Volatile Content of Linseed
Hasan Yalcin,Ismet Ozturk,Mehmet Hayta,Osman Sagdic,Tuncay Gumus 한국식품영양과학회 2011 Journal of medicinal food Vol.14 No.10
The effect of irradiation (2.5, 4.0, 5.5, and 7.0 kGy) on chemical properties and volatile contents of linseed was investigated. Consistent decreases were observed in both protein and oil content of the irradiated linseed samples with increasing irradiation doses. The ash content of the irradiated linseed samples increased significantly (P<.05) with increasing irradiation doses except for 5.5 kGy. Irradiation treatment caused irregular changes in palmitic and stearic acid content. Although styrene and p-xylene content decreased as a result of irradiation, 1-hexanol content only decreased at 7.0 kGy. Benzaldehyde, p-cymene, and nonanol were not determined at irradiation doses above 4.0 kGy
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Volatile Compounds and Bioactivity of Eremurus spectabilis (Ciris), a Turkish Wild Edible Vegetable
Kevser Karaman,Busra Polat,Ismet Ozturk,Osman Sagdic,Cihat Ozdemir 한국식품영양과학회 2011 Journal of medicinal food Vol.14 No.10
Eremurus spectabilis grows in the spring as a wild vegetable and for many years has been used both as a food or food additive and for therapeutic purposes. This study investigated the total phenolic content and the antimicrobial, antioxidant, and antiradical activities of methanol, ethanol, and aqueous extracts of E. spectabilis (obtained from the Antalya region of Turkey). In addition, volatile compounds of E. spectabilis were characterized by using gas chromatography/mass spectrometry. Major components of E. spectabilis volatile compounds were carvone (44.64%), carvacrol (14.45%), pentane, 2-methyl- (7.34%), (E)-caryophyllene (5.57%), valencene (5.11%), cis-calamenene (2.01%), cadalene (1.10%), and acetic acid (1.12%). The highest total phenolic content was seen with methanol extract (mean±standard deviation, 31.92±0.48 mg gallic acid equivalents/g dry extract). The ethanol extract showed the highest antiradical activity, with a 50% inhibitory concentration of 35.14 μg/L in the 1,1-diphenyl-2- picrylhydrazyl assay. The strongest antioxidant activity was detected in methanol extract (81.72±0.62 mg ascorbic acid equivalents/g). Twelve bacteria species were used to analyze the antimicrobial activity of extracts. The 1% concentrations of all extracts showed no inhibitive effect on any bacterium. The most resistant bacterium was Yersinia enterocolitica, and the most sensitive bacterium was Pseudomonas aeruginosa. A positive correlation was seen between concentrations and inhibition zones, and some differences occurred between antimicrobial activity of other concentrations.
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