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Changes in Salt Solubility and Microstructure of Proteins from Herring (Clupea harengus) after pH-Shift Processing

Sofia Marmon (Institutionen för kemi- och bioteknik, Livsmedelsvetenskap) ; A. Krona ; M. Langton ; Ingrid Undeland (Institutionen för kemi- och bioteknik, Livsmedelsvetenskap)
Journal of Agricultural and Food Chemistry (0021-8561). Vol. 60 (2012), 32, p. 7965-7972.
[Artikel, refereegranskad vetenskaplig]

Salt solubility of pH-shift isolated herring (Clupea harengus) muscle proteins was studied in relation to pH exposure and microstructure using transmission electron microscopy (TEM). Using protein solubilization at pH 11.2 with subsequent precipitation at pH 5.5, salt solubility of the proteins decreased from 78 to 17%. By precipitating the alkali-solubilized proteins at the pH of native herring muscle, 6.5, salt solubility only decreased to 59%, proving that pH values between 6.5 and 5.5 affected protein salt solubility more than the pH cycle 6.5 -> 11.2 -> 6.5. Precipitation at pH 5.5 resulted in hydrogen bonds, hydrophobic interactions, and S-S bridges, whereas precipitation at pH 6.5 resulted only in the formation of hydrophobic interactions. The alkaline pH-shift isolation process severely rearranged the protein microstructure, with precipitation at pH 6.5 forming a finer, more homogeneous network than precipitation at pH 5.5. The former protein isolate also contained less lipid oxidation products and formed more deformable gels, without affecting protein yield.

Nyckelord: pH-shift, alkaline solubilization, precipitation, salt solubility, protein, trout oncorhynchus-mykiss, fish muscle proteins, gelation, characteristics, lipid oxidation, cod muscle, acid, alkali, extraction, recovery, storage



Denna post skapades 2012-09-20.
CPL Pubid: 163628

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Livsmedelsvetenskap (2005-2014)

Ämnesområden

Kemi

Chalmers infrastruktur