Regenerated Fibers from Rennet-Treated Casein Micelles during Acidification.

ABSTRACT: Micellar casein fibers of defined size and internal structure can be produced by the extrusion of cold-renneted casein micelles into a warm, calcium-rich coagulation bath. Calcium phosphate contacts within the casein matrix are important for fiber stability and production but become less important under acidic pH conditions. We demonstrate this with swelling experiments in media with pH < 2, which we adjust with citric acid of different molarities. In contrast to the simple swelling of dried casein fibers in water, a two-phase process takes place in citric acid similar to swelling in 1 N HCl. However, instead of a second deswelling step, we observe in citric acid that the fiber swells further. The observation is explained by a pH-dependent transition from a rennet casein gel to an acidifie

SUBMITTER: Gebhardt R 

PROVIDER: S-EPMC10378896 | biostudies-literature | 2023 Jul

REPOSITORIES: biostudies-literature