Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Effect of exopolysaccharides and inulin on the proteolytic, angiotensin-I-converting enzyme- and α-glucosidase-inhibitory activities as well as on textural and rheological properties of low-fat yogurt during refrigerated storage

Effect of exopolysaccharides and inulin on the proteolytic, angiotensin-I-converting enzyme- and... Whey separation during storage continues to be one of the major problems in low-fat yogurts. Exopolysaccharides (EPS) produced by lactic acid bacteria have been recognized as a solution to this problem. Inulin is accepted as a fat replacer in products such as low-fat yogurts, in addition to providing physiological benefits. A combination of EPS and inulin could give both health- and texture-promoting properties to low-fat yogurt. Therefore, the aim of this study was to comprehensively study the influence of using an EPS-producing strain of Streptococcus thermophilus along with inulin (3%, wt/vol) on the viability of S. thermophilus and Lactobacillus delbrueckii ssp. bulgaricus, their proteolytic, ACE- and α-glucosidase-inhibitory activities, as well on the textural and rheological properties of low-fat yogurt during storage at 4 °C for 28 days. The time to reach a pH of 4.5 was less in the presence of EPS-producing S. thermophilus. However, during storage, EPS and inulin together did not influence the pH and lactic acid, and the effect on ACE-inhibition activity varied with the period of storage. The presence of EPS showed a protective effect on the survival of Lb. delbrueckii ssp. bulgaricus and partially on the extent of proteolysis. The α-glucosidase-inhibitory activity was more apparent in EPS-containing yogurt. The yield of EPS varied with the period of storage, being maximal (110.77 mg·100 g−1)at d 14. EPS-containing yogurts showed lower firmness, spontaneous whey separation, storage modulus, yield stress, consistency index and hysteresis area than non-EPS producing yogurts. It was concluded that low-fat yogurt with a stable and compact texture having anti-hypertensive and anti-diabetic potential could be obtained using an EPS-producing strain of S. thermophilus. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Dairy Science & Technology Springer Journals

Effect of exopolysaccharides and inulin on the proteolytic, angiotensin-I-converting enzyme- and α-glucosidase-inhibitory activities as well as on textural and rheological properties of low-fat yogurt during refrigerated storage

Dairy Science & Technology , Volume 89 (6) – May 21, 2011

Loading next page...
 
/lp/springer-journals/effect-of-exopolysaccharides-and-inulin-on-the-proteolytic-angiotensin-3ofMqLZ6kF
Publisher
Springer Journals
Copyright
Copyright © 2009 by Springer S+B Media B.V.
Subject
Chemistry; Food Science; Agriculture; Microbiology
ISSN
1958-5586
eISSN
1958-5594
DOI
10.1051/dst/2009039
Publisher site
See Article on Publisher Site

Abstract

Whey separation during storage continues to be one of the major problems in low-fat yogurts. Exopolysaccharides (EPS) produced by lactic acid bacteria have been recognized as a solution to this problem. Inulin is accepted as a fat replacer in products such as low-fat yogurts, in addition to providing physiological benefits. A combination of EPS and inulin could give both health- and texture-promoting properties to low-fat yogurt. Therefore, the aim of this study was to comprehensively study the influence of using an EPS-producing strain of Streptococcus thermophilus along with inulin (3%, wt/vol) on the viability of S. thermophilus and Lactobacillus delbrueckii ssp. bulgaricus, their proteolytic, ACE- and α-glucosidase-inhibitory activities, as well on the textural and rheological properties of low-fat yogurt during storage at 4 °C for 28 days. The time to reach a pH of 4.5 was less in the presence of EPS-producing S. thermophilus. However, during storage, EPS and inulin together did not influence the pH and lactic acid, and the effect on ACE-inhibition activity varied with the period of storage. The presence of EPS showed a protective effect on the survival of Lb. delbrueckii ssp. bulgaricus and partially on the extent of proteolysis. The α-glucosidase-inhibitory activity was more apparent in EPS-containing yogurt. The yield of EPS varied with the period of storage, being maximal (110.77 mg·100 g−1)at d 14. EPS-containing yogurts showed lower firmness, spontaneous whey separation, storage modulus, yield stress, consistency index and hysteresis area than non-EPS producing yogurts. It was concluded that low-fat yogurt with a stable and compact texture having anti-hypertensive and anti-diabetic potential could be obtained using an EPS-producing strain of S. thermophilus.

Journal

Dairy Science & TechnologySpringer Journals

Published: May 21, 2011

References