Yazar "Tugay, Mehmet I." seçeneğine göre listele

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    Hazelnut (Corylus avellana L.) skin, a by-product of hazelnut industry, possesses oil with high oxidative and thermal stabilities
    (Wiley, 2023) Celik, Omer F.; Aktas, Nesimi; Tugay, Mehmet I.; Tuncil, Yunus E.
    Due to its high antioxidant capacity, hazelnut (Corylus avellana L.) skin oil has recently gained great attention. However, its thermal and oxidative characteristics have not been elucidated yet. Here, we determined the thermal and oxidative properties, antioxidant activity and fatty acid composition of hazelnut skin oil (HSO) using differential scanning calorimetry (DSC), spectrophotometry and gas chromatography/mass spectrometry, respectively, and compared those with the oils from natural and roasted hazelnuts. HSO was found to have significantly higher proportions of polyunsaturated fatty acid, compared with oils from natural and roasted hazelnut. HSO had the lowest melting point. Moreover, HSO revealed higher oxidative stability, which can be attributed to its greater antioxidant capacity. These findings indicate that hazelnut skin, a by-product of hazelnut industry, has potential to be utilised in hazelnut oil industry to produce oil possessing high oxidative and thermal stability.
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    Sex-dependent colonic microbiota modulation by hazelnut (Corylus avellana L.) dietary fiber
    (Royal Soc Chemistry, 2023) Dastan, Elanur; Celik, Omer F.; Bas, Orhan; Bulut, Zafer; Lindemann, Stephen R.; Tugay, Mehmet I.; Degermenci, Muhammet
    Although many efforts have been made to characterize the functional properties of hazelnut constituents (mainly its oil, protein, and phenolics), those of its dietary fiber (DF) have not been elucidated yet. Here, we aimed to investigate the impact of DF of natural and roasted hazelnuts, and hazelnut skin on the colonic microbiota in vivo (C57BL/6J mouse models) by determining their composition through 16S rRNA sequencing and microbial short-chain fatty acids (SCFAs) using gas chromatography. Our results revealed that hazelnut DF generally showed an acetogenic effect in male mice, whereas the same trend was not observed in the female counterparts. The 16S rRNA sequencing results showed that hazelnut DF, especially that of natural hazelnuts, increased the relative abundances of Lactobacillus-related OTUs that have probiotic potential. LEfSe analysis indicated that, for female mice, Lachnospiraceae, Prevotella, Ruminococcaceae, and Lactobacillus were found to be discriminators for DF of natural hazelnuts, roasted hazelnuts, hazelnut skin, and control, respectively, whereas Bacteroides, Lactobacillus, Prevotella, and Lactococcus were the discriminators for the male counterparts, respectively. This study clearly indicates that, although the roasting process slightly alters the functionalities, hazelnut DF favors beneficial microbes and stimulates beneficial microbial metabolites in the colon in a sex-dependent way, which could be a contributing factor to the health-promoting effects of hazelnuts. Furthermore, hazelnut skin, a byproduct of the hazelnut industry, was found to have potential to be utilized to produce functional DF targeting colonic health.