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Articles by Cigdem YENISEY
Total Records ( 2 ) for Cigdem YENISEY
  Belgin Siriken , Ozgur Cadirci , Gokhan Inat , Cigdem Yenisey , Mukadder Serter and Mehmet Ozdemir
  In this study, a total of 100 Turkish sucuk samples were analyzed for pysico-chemical and microbiological quality. The maximum levels of moisture, fat and pH limited by Turkish food regulation are 40, 40% Fresh Matter (FM) and 5.8, respectively and sucuk should not contain any starch. In these respects, while 51.5 and 32% of the samples was found high for moisture and pH values, respectively, all the samples were almost suitable for fat value. Starch was detected in 66% of the samples. Lactobacilli and micrococci/staphylococci were <102-108 and <102-107 cfu g-1, respectively. There were negative correlations between Lactobacilli levels and pH values (p<0.01). However, at a few sucuk samples, there were no correlation between Lactobacilli and pH values. NaCl was detected in above 5% Dry Matter (DM) of 25 the samples. Maximum and minimum collagen and hydroxyproline levels were detected in 3.20-9.68 and 0.40-1.21 μg mg-1 (DM), respectively. According to analyzed results, the percentage of moisture, fat, pH, NaCl, starch, collagen and hydroxyproline levels showed variation among the sample analyzed. There is not any official regulation for collagen and hydroxyproline levels of Turkish sucuk. Therefore, this and these kinds of studies may serve as a basis for the preparation of Official Standards of quality for collagen and hydroxyproline content of sucuk in Turkey.
  Kamil SEYREK , Hakan ERBAS , Mukadder SERTER , Cigdem YENISEY , Funda KIRAL and Husnu Erbay BARDAKCIOGLU
  A considerable body of data exists regarding the role of vitamin C in mammalian physiology; however, there are no data about the effects of dietary ascorbic acid supplementation on collagen concentrations and amino acid levels in animals exposed to heat stress. The present study investigated the effects of supplementary ascorbic acid intake on collagen concentrations in the brain and heart tissue in Japanese quails. In addition, glycine, glutamine, histidine, asparagine, and serine contents in the livers of the same animals were measured. Japanese quails were allocated into 4 groups, each of which was exposed to heat stress (34.8 ± 1.25 °C) for 75 days. Control animals were fed a basal diet, while animals in the experimental groups were fed a basal diet supplemented with 150, 250, or 500 mg of L-ascorbic acid kg-1 of diet. Compared to the control group, mean collagen concentration in brain tissue significantly (P < 0.05) increased only in Japanese quails given 250 mg of L-ascorbic kg-1 of diet. On the other hand, heart tissue collagen content in the quails fed vitamin C did not significantly increase; in fact, the collagen content in the group fed 500 mg of L-ascorbic acid kg-1 of diet significantly decreased (P < 0.01). Amino acid content in the liver significantly increased in the group fed 150 mg of L-ascorbic acid kg-1 of diet (P < 0.01 for serine and P < 0.001 for the others).
In conclusion, vitamin C had profound effects on collagen synthesis and amino acid metabolism in Japanese quails subjected to heat stress. Results of the present study also indicate that addition of high-dose dietary vitamin C-higher than 250 mg kg-1 of diet-may have detrimental effects in quails exposed to heat stress.
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