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dc.contributor.supervisor Scanlon, Martin (Food Science) Fulcher, Gary (Food Science) en
dc.contributor.author Repin, Nikolay
dc.date.accessioned 2011-01-17T18:14:52Z
dc.date.available 2011-01-17T18:14:52Z
dc.date.issued 2011-01-17T18:14:52Z
dc.identifier.uri http://hdl.handle.net/1993/4350
dc.description.abstract Acidified dairy products are one of the oldest types of food products. Unfortunately all of them are low in dietary fibre. Thus, to improve health benefit of these products the idea of fortifying them with dietary fibre seems attractive. However dairy products enriched with Glucagel (a commercial product that is high in barley β-glucan) were found to suffer from textural defects. When the Glucagel concentration exceeded a certain value (5 g/L), dramatic phase separation was observed in set yogurt and yogurt drink with volume fraction of casein micelles greater then 0.108. To investigate interactions of β-glucan polymers and casein micelles in the milk prior to setting of yogurt, mixtures of yogurt milk and Glucagel were systematically studied. Depending on the volume fraction of casein micelles and the Glucagel concentration, a stable phase or a gel or a sedimented material could exist. The driving force for phase separation was depletion flocculation of casein micelles in the presence of β-glucan. The phase separation responsible for textural defects in yogurt systems supplemented with high amounts of Glucagel can be avoided by the reduction of β-glucan molecular weight, a process that limits the range of attraction between micelles. Incubation of Glucagel with lichenase for 90 min resulted in homogeneous (stable) yogurt systems with Glucagel concentrations as high as 10 g/L. en
dc.format.extent 76847257 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.subject β-glucan en
dc.subject yogurt en
dc.subject depletion flocculation en
dc.title Mechanisms of stabilizing fibre-enriched acidified dairy products en
dc.degree.discipline Food Science en
dc.contributor.examiningcommittee Holley, Rick (Food Science) Ames, Nancy (Agriculture and Agri-Food Canada) en
dc.degree.level Master of Science (M.Sc.) en
dc.description.note February 2011 en


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