P4 Rest materials from fishery as feedstock for fermentation production of biosurfactants

P4 Rest materials from fishery as feedstock for fermentation production of biosurfactants 

Nga Dang1, Vasskog2, Eksteen2and Whitaker3

1Process And Environmental Technology, Norut Narvik, Narvik, NOR
2Norut Tromsø, Tromsø, NOR
3Marine Biotech, Nofima, Tromsø, NOR

Identifying cheap alternative feedstocks for fermentation production of biosurfactants is the main goal of our study. Fish peptone prepared from low-grade by-products of fish production and waste oil fractions from omega-3 production were tested as substrate for production of bacterial biosurfactant. All twelve of the tested bacterial isolates showed good growth on the fish peptone. Among them, one strain showed significant surface tension reduction of the culture broth when incubated with the light oil fraction, which contains a range of fatty acids with 14:0, 16:0, 16:1 and 18:1 as main component. Eight strains showed significant surface tension reduction with the heavy oil fraction, which contains longer fatty acids with main components being 20:5 and 24:1. The surface tension of the cultured broth reduced from 72 mNm-1 to about 28-34 mNm-1 suggested the strains produced biosurfactants. The novel biosurfactants will be purified and characterized for chemical structures and properties.