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Öğe Characterisation of probiotic properties of yeast strains isolated from kefir samples(WILEY, 2021) Göktaş, Hamza; Dikmen, Hilal; Demirbas, Fatmanur; Sagdic, Osman; Dertli, EnesThis study aimed to isolate and identify yeast species from kefir samples and to determine their probiotic characteristics in comparison with commercial probiotic yeast Saccharomyces boulardii. The microbial flora of traditional kefir samples were dominated by Saccharomyces cerevisiae and Kluyveromyces marxianus. Kefir isolates demonstrated higher auto-aggregation, hydrophobicity and antioxidant properties compared to S. boulardii although S. boulardii demonstrated the highest survival rate under in vitro gastrointestinal digestion conditions followed by two kefir yeasts K. marxianus and Kazachstania unispora. Importantly, kefir isolates revealed strong antifungal activities against mould species except Penicillium roqueforti. These findings suggest probiotic and functional roles of yeast strains isolated from traditional kefir samples.Öğe Characteristics of functional ice cream produced with probiotic Saccharomyces boulardii in combination with Lactobacillus rhamnosus GG(Elsevier, 2022) Göktaş, Hamza; Dikmen, Hilal; Bekiroğlu, Hatice; Çebi, Nur; Dertli, EnesIce creams have big potential to be used as probiotic food carrier. In this respect, this study aimed to produce ice creams with addition of Saccharomyces boulardii and Lactobacillus rhamnosus GG. Probiotic strains were added to the ice cream mixes before and after aging steps of ice cream production and were inoculated as single or mix cultures. Probiotic ice cream products were then characterized and the survival of the probiotic strains were determined during storage period. Both probiotic strains successfully survived during storage period and their numbers were above 6.18 log CFU/g at final date of storage. The rheological parameters of ice cream products improved with the co-inoculation of S. boulardii and L. rhamnosus both before and after aging step. Importantly the aroma profile of ice cream samples altered with probiotic inoculation and ethanol was the major volatile compound in ice cream samples produced with S. boulardii added before aging step. Inoculation of S. boulardii and L. rhamnosus as single cultures also resulted in formation of distinct aroma compounds in ice cream products. The highest overall acceptability score in sensorial evaluation of ice cream products was obtained from the ice cream products produced with inoculation of probiotics after aging step.Öğe Determination of rheological, melting and sensorial properties and volatile compounds of vegan ice cream produced with fresh and dried walnut milk(AZTI-Tecnalia, 2022) Bekiroğlu, Hatice; Göktaş, Hamza; Karaibrahim, Dila; Bozkurt, Fatih; Sağdıç, OsmanDemand for vegan foods increases day by day and plant-based milks are used in the production of dairy products like ice cream. So, in this study two type of walnut milk, dried and fresh, was used to produce ice cream. The use of walnut milk in ice cream production significantly affected the physicochemical properties of ice cream samples and the fat content increased due to the high fat content of walnut. Overrun level of ice cream samples positively affected by using walnut milk in production of ice cream. The use of walnut milk in ice cream production improved the rheological properties, although it decreased brightness value of ice cream samples. L-limonene was determined as the major volatile compounds in all ice cream samples and it was determined that the use of walnut milk created different volatile compounds. Finally, according to the sensory evaluation results, the ice cream samples produced using walnut milk were liked by the panelists and received similar scores compared to the control, and this study showed that walnut milk can be used in ice cream production. © 2022 Elsevier B.V.Öğe Investigation effects of inulin degree of polymerization on compound chocolate quality(Wıley, 2021) Göktaş, Hamza; Konar, Nevzat; Sağdıç, Osman; Toker, Ömer SaidThis is the first study in which the effect of degree of polymerization (DP) (?10 and ?23) of inulin (6.00, 9.00, and 12.0/100 g) on main quality parameters (color, texture, water activity, sensory properties, and melting behavior) of compound chocolate's (CC) was investigated. According to the determined L* values, using inulin (12/100 g) with high DP resulted in more glossy samples (p < .05). Except ?h value, the melt ing parameters of CC were not affected. However, the hardness of samples (391.9– 587.1 g) was determined in a wide range. The CC samples including inulin with higher DP had higher aw values (p < .05). According to the results of sensory analysis, using low DP inulin (<12/100 g) has advantages when compared with higher DP inulin containing samples. As a result, DP is an important parameter for developing choco late enriched with inulin as a fiber source, prebiotic, and/or bulking agents. Novelty Impact Statement: This is the first study in which the effects of inulin de gree of polymerization (DP) and concentrations (6.00, 9.00, and 12.0/100 g) on the main quality parameters of compound chocolate were investigated. The effect of (DP) (?10 and ?23) of inulin on the main quality parameters of compound chocolate samples as color, texture, water activity, melting behavior, and sensory properties was determined.
