Person: ÖZCAN, TÜLAY
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ÖZCAN
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TÜLAY
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Publication Effect of stevia and inulin interactions on fermentation profile and short-chain fatty acid production of Lactobacillus acidophilus in milk and in vitro systems(Wiley, 2022-02) Özcan, Tülay; Eroğlu, Ezgi; ÖZCAN, TÜLAY; Eroğlu, Ezgi; Bursa Uludağ Üniversitesi/Ziraat Fakültesi/Gıda Mühendisliği Bölümü; 0000-0002-0223-3807; AAG-8194-2021; EWZ-7641-2022In this study, the effect of stevia and inulin interactions on fermentation profile of Lactobacillus acidophilus in milk and in vitro systems was investigated. The medium were analysed for pH, cell density (OD600), probiotic bacterial counts, prebiotic activity score (PAS), lactic acid and short-chain fatty acid (SCFA) content. In the second stage of the study, the potential prebiotic activity of stevia and its effect on milk fermentation characteristics as sugar substitute were evaluated in symbiotic milk system. Consequently, it was found that stevia improved the survival of L. acidophilus in in vitro and in the milk matrix and could be assigned as a potential prebiotic source and sugar replacer for the manufacture of sugar-reduced dairy products. These results show that the in vitro-positive prebiotic activity of stevia is closer to inulin and is related to its fermentation profile and growth parameters with high short-chain fatty acid production. The counts of probiotic bacteria remained within the biotherapeutic level (>7 log(10) cfu/mL) during 28 days of storage in stevia and inulin milk system with high viscosity index and gel characteristics.Publication The characterisation of dairy industry waste buttermilk from different butter processing procedures(Parlar Scientific Publications (PSP), 2020-01-01) Avcı, H. Rıza; Özcan, Tülay; ÖZCAN, TÜLAY; Bursa Uludağ Üniversitesi/Ziraat Fakültesi/Gıda Mühendisliği Bölümü.; 0000-0002-0223-3807; AAG-8194-2021Buttermilk is high nutritional value byproduct obtained from butter making. Consisting of such ingredients as lactose, casein, serum proteins, mineral substances, it is liquid phase released by churning the cream during the process. Today, butter production is carried out in two different ways: "Batch Method" and "Continuous Method". In this study, the composition of the buttermilks, released by the batch and continuous butter production systems were compared. In conclusion, butter production methods have been effective on physicochemical composition and amino acid values of buttermilks (p<0.01, p<0.05). Batch process buttermilks have high amount of total solids, protein, fat and acidity values. Continuous system buttermilks contain high level of amino acids and aspartic acid, glutamic acid, serine, proline, leucine have been found to be the most common amino acids among them.Publication Effect of acacia exudate gum on milk gel fermentation of flavoured synbiotic yoghurt enriched with daucus carota L. ssp. sativus var.atrorubens alef fibre(Croatian Dairy Union, 2021-06-01) Özcan, Tülay; Karaman, Saliha; ÖZCAN, TÜLAY; Karaman, Saliha; Bursa Uludağ Üniversitesi/Ziraat Fakültesi/Gıda Mühendisliği Bölümü; 0000-0002-0223-3807; AAG-8194-2021; CXT-2807-2022Fortifying yoghurt or dairy products with fibres and probiotic bacteria is an increasing interest to create functional foods with health benefits and improve their functionality. In this study milk fermented with acacia exudate gum and black carrot (Daucus carota L. ssp. sativus var. atrorubens alef) pulp components had a significantly shorter fermentation time than the others in milk fermented with Streptococcus thermophilus, Lactobacillus delbrueckii subsp. bulgaricus, Lactobacillus acidophilus and Bifidobacterium animalis subsp. foals. Potential prebiotic addition increased the cohesiveness, index of viscosity and decreased the index of syneresis in synbiotic yoghurt samples. Sensory evaluation showed that incorporation of functional components increased satisfactory texture, and had sensory characteristics with high scores during cold storage.Publication Determination of gelation properties and bio-therapeutic potential of black carrot fibre-enriched functional yoghurt produced using pectin and gum arabic as prebiotic(Wiley, 2021-03-31) Karaman, Saliha; Özcan, Tülay; Karaman, Saliha; ÖZCAN, TÜLAY; Bursa Uludağ Üniversitesi/Ziraat Fakültesi/Gıda Mühendisliği Bölümü; 0000-0002-0223-3807; AAG-8194-2021; CXT-2807-2022In this study, bacterial viability, changes in gel matrix properties of functional yoghurts produced with the addition of black carrot (Daucus carota ssp. sativus var. atrorubens Alef variety) fibre, pectin and gum arabic during storage, was investigated with consumer preference and bio-therapeutic potential. Streptococcus thermophilus, Lactobacillus delbrueckii subsp. bulgaricus, Lactobacillus acidophilus and Bifidobacterium animalis subsp. lactis cultures were used in the production of probiotic yoghurts. It was found that the addition of pectin, gum arabic and black carrot fibre to probiotic yoghurt stimulated the growth of probiotic bacteria and gel development during storage. The viability of the probiotic bacteria was determined within the bio-therapeutic level (>7 log(10) cfu/g) with potential prebiotic effects. It was determined that black carrot, pectin and gum arabic addition increased the total phenolic content and antioxidant activity of probiotic yoghurts, as well as improved the textural properties. Sensorial attributes increased throughout storage with yoghurts containing gum arabic and black carrot displayed higher scores for sensorial qualifications.Publication Evaluation of bioaccessibility and functional properties of kombucha beverages fortified with different medicinal plant extracts(TUBİTAK, 2021-01-01) Tamer, Canan Ece; TAMER, CANAN ECE; Temel, Sehime Gulsun; TEMEL, ŞEHİME GÜLSÜN; Suna, Senem; SUNA, SENEM; Karabacak, Azime Ozkan; ÖZKAN KARABACAK, AZİME; Ozcan, Tulay; ÖZCAN, TÜLAY; Ersan, Lutfiye Yilmaz; YILMAZ ERSAN, LÜTFİYE; Kaya, Berra Turkol; Copur, Omer Utku; ÇOPUR, ÖMER UTKU; Bursa Uludağ Üniversitesi/Tıp Fakültesi.; Bursa Uludağ Üniversitesi/Tıp Fakültesi/Genetik Anabilim Dalı.; 0000-0002-9802-0880; 0000-0002-6947-2167; 0000-0003-4175-4477; 0000-0002-0223-3807; AAQ-8178-2020; AAG-8503-2021; AAG-8194-2021; AAH-2319-2019; AAC-1982-2022In this study, sweetened black and green tea were utilized as substrate for kombucha fermentation. Linden, lemon balm, sage, echinacea, mint, and cinnamon infusions were added to kombucha to design a novel beverage with Unproved functional and organoleptic characteristics. After fermentation, the antioxidant capacity (AC) of the kombucha increased by 13.96% 2,2-diphenyl-1-picryl-hydrazyl-hydrate (DPPH), 48.90% ferric reducing antioxidant power (FRAP), and 55.54% cupric reducing AC (CUPRAC). On days 0 and 9 of storage, the bioaccessibility of the total phenolics and AC (FRAP and CUPRAC) in all of the samples showed a significant increase after gastric and intestinal digestion when compared to pregastric digestion (P < 0.05). The AC (DPPH) after in vitro digestion at the beginning and end of storage in all of the beverages also increased after gastric digestion when compared to pregastric digestion (P < 0.05); however, it decreased after intestinal digestion (P < 0.05). By conducting in vitro and in vivo studies, the effects of kombucha on health and nutrition need to be further investigated.