pH-driven solubilization and isoelectric precipitation of proteins from the brown seaweed Saccharina latissima—effects of osmotic shock, water volume and temperature
Artikel i vetenskaplig tidskrift, 2017

In the light of the global search for novel and sustainable protein sources, macroalgal proteins are becoming an attractive target. To date, mainly red and green macroalgae have been investigated in this respect, whereas the brown species are less studied, possibly because of the lower content of protein. In a biorefinery context, however, the protein content of brown macroalgae can still be economically interesting due to fast growth and the possibility to co-extract other compounds, such as alginates. The aim of this study was to develop a simple, scalable pH-shift based protein isolation technique applicable on wet Saccharina latissima biomass. Factors investigated were extraction volume, temperature, protein solubilization pH, osmoshock pre-treatment and protein precipitation pH. Maximum protein solubility was obtained at pH 12, where 34% of the total protein content could be extracted with 5.56 volumes of extraction solution (20 volumes on dry weight (dw) basis). Osmoshocking significantly increased the yield, and 20, 40 and 60 volumes of water (dw basis) gave 45.1, 46.8 and 59.5% yield, respectively. The temperature during osmoshocking did not significantly affect the extraction yield, and extended time (16h vs. 1h or 2h) reduced protein yield. Precipitation of solubilized proteins was possible below pH 4; the highest precipitation yield, 34.5%, was obtained at pH 2. After combined alkaline extraction and acid precipitation, 16.01% of the Saccharina proteins were recovered, which can be considered acceptable in comparison to other studies on algae, but leaves some room for improvement when comparing to protein extraction from for instance soy.

solubility

protein

precipitation

pH

Saccharina latissima

seaweed

Författare

Jenny Veide Vilg

Chalmers, Biologi och bioteknik, Industriell bioteknik

Göteborgs universitet

Chalmers, Biologi och bioteknik, Livsmedelsvetenskap

Ingrid Undeland

Chalmers, Biologi och bioteknik, Livsmedelsvetenskap

Journal of Applied Phycology

0921-8971 (ISSN) 1573-5176 (eISSN)

Vol. 29 1 585-593

Drivkrafter

Hållbar utveckling

Ämneskategorier

Livsmedelsvetenskap

Biologiska vetenskaper

Livsmedelsteknik

Kemi

Styrkeområden

Livsvetenskaper och teknik

DOI

10.1007/s10811-016-0957-6