Quality parameters, probiotic viability and sensory properties of probiotic stirred sesame yogurt
Laboratoire de Biomathématiques, Biophysique, Biochimie et Scientométrie, Faculté des Sciences de la Nature et de la Vie, Université de Bejaia, Radia Arab, Mohamed Lamine Freidja, Laboratoire de Biomathématiques, Biophysique, Biochimie et Scientométrie, Faculté des Sciences de la Nature et de la Vie, Université de Bejaia, B. Dave Oomah, Laboratoire de Biomathématiques, Biophysique, Biochimie et Scientométrie, Faculté des Sciences de la Nature et de la Vie, Université de Bejaia, Sonia Benali, Laboratoire de Biomathématiques, Biophysique, Biochimie, et Scientométrie (L3BS), Faculté des Sciences de la Nature et de la Vie, Khodir Madani, Laboratoire de Biomathématiques, Biophysique, Biochimie, et Scientométrie (L3BS), Faculté des Sciences de la Nature et de la Vie, Lila Boulekbache‐Makhlouf, Laboratoire de Biomathématiques, Biophysique, Biochimie, et Scientométrie (L3BS), Faculté des Sciences de la Nature et de la Vie
Abstract
The beneficial effects of sesame seeds are of great interest for the conception of healthy dairy products such as probiotic stirred yogurt. We investigated the effects of adding raw or roasted sesame seeds on the probiotic viability, quality parameters and consumers acceptability of stirred yogurt during 28 days cold storage (4 °C). All yogurts were analyzed for microbial counts (starter culture and probiotic), pH, titratable acidity, proteolytic activity, syneresis and antioxidant activity. Yogurts containing sesame seeds showed the highest probiotic counts, proteolytic activity, radical scavenging activity high titratable acidity, and low pH. Raw and roasted sesame can selectively impact probiotic growth with limited effect on yogurt starter culture especially at long cold storage (14-28 days). Yogurts enriched with roasted sesame had higher sensory acceptability compared to control and probiotic yogurts. Roasted sesame can be successfully incorporated to improve probiotic viability and sensory properties of stirred yoghurt, as well as to improve the antioxidant properties.