The main objective of the study was to determine the effects of fat replacers and storage time on kefir quality. The use of fat replacers and the storage time significantly affected the physicochemical, microbiological and sensory parameters. During storage time, protein (%), titratable acidity (%), pH and viscosity (cP) of kefir samples ranged from 2.89 to 3.48, 0.80 to 0.88, 4.27 to 4.42 and from 543.83 to 651.00, respectively. Ethyl alcohol (%), acetic acid (mg/mL) and lactic acid (mg/ mL) contents of kefir samples ranged from 0.05 to 0.22, 0.22 to 0.25 and 1.73 to 1.82, respectively. In stored samples, Streptococci, Lactobacilli, yeast and total bacteria counts varied between 8.09 and 9.43, 8.09 and 8.54, 2.63 and 4.74, 8.10 and 9.44 log cfu/mL, respectively. Litesse-added kefir samples had the highest total acceptability scores and revealed maximum acceptability levels at the 28 days of storage. PRACTICAL APPLICATIONSKefir is a refreshing fermented milk beverage and it has slightly alcoholic flavor. The production of kefir is unique because of a simultaneous combination of lactic acid and alcoholic fermentation of lactose. Although commercial kefir is traditionally manufactured from cow's milk, it has also been made from the milk of ewe, goats and buffalos. Goat milk has been identified as an alternative for infants and adults who are either sensitive or allergic to cow milk. The increasing awareness of consumers toward a healthy and balanced diet has forced the food industry to introduce fat-reduced or low-fat food commodities. Reduced-fat kefirs can be produced by replacing partially the fat content of the milk base with low-calorie products known as fat replacers.

In recent years, with the awareness of people, the interest in natural and functional foods has increased. Sourdough is a dough piece in which industrial culture yeasts (Saccharomyces cerevisiae), endogenous yeasts, lactic and acetic bacteria from the air and the ingredients used (flour, water, etc.) are active. In sourdough fermentation, yeast and lactic acid bacteria work together to form the natural flora. It has been proven by studies that breads prepared from sourdough have many advantages such as greater volume increase, stronger aroma, better crumb structure and long shelf life. In addition, sourdough fermentation has very important positive effects on human health. Various additives (malt flours, emulsifiers, microbial enzymes, dairy products, soy flour and potato flour) are used to delay the staling of bread. In the production of sourdough bread, high quality and long shelf-life breads can be obtained without the need for these additives. Thus, both natural and additive-free and functional breads are produced. In this review, it is aimed to raise awareness by giving information about the advantages of using sourdough in bread production. In the study, the concept of sourdough was discussed and information was given about the content of bread prepared using sourdough and its benefits on health.

Goat milk has a great importance for human nutrition considering its nutrient content. In addition, the demand for goat milk and products derived from goat milk has increased in recent years. However, the microbiological properties of milk can directly affect human health. In this study, it was aimed to determine the nutrient content and some microbiological properties of goat milk obtained from different farms. In the study, hand milking farms were determined. After milking, a sufficient amount of milk sample was taken and brought to the laboratory at +4°C. In the milk samples, the composition of the milk, the total number of aerobic mesophilic bacteria, the number of yeast-mold and coliform bacteria were determined. The highest protein, lactose and solids ratio (%) was obtained in milk samples taken from farms 2 and 4. The highest fat content in milk was determined in the sample taken from farm 4. It was observed that the milks of farms 2, 3 and 4 had similar mineral substance amounts. Total aerobic mesophilic bacteria (PCA) count (191×104), yeast-mold (PDA) count (42×103) and coliform bacteria (VRBA) count (710×102) were determined in farm 2. As a result, in terms of some milk components were determined statistical differences between farms. The main difference is in terms of milk hygiene. However, it was determined that the milk showed significant changes in terms of microbiological properties according to the farms from which they were obtained. It can also be said that these changes may affect the health of people who directly or indirectly consume these milks.