چکیده (انگلیسی):

The need for cleaner sources of energy has stirred research into utilising alternate fuelsources with favourable emission and sustainability such as biodiesel. However, there aretechnical constraints that hinder the widespread use of some of the low cost raw materi-als such as pork fatty wastes. Currently available technology permits the use of lipolyticmicroorganisms to sustainably produce energy from fat sources; and several microorgan-isms and their metabolites are being investigated as potential energy sources. Thus, the aimof this study was to characterise the process of Staphylococcus xylosus mediated fermentationof pork fatty waste. We also wanted to explore the possibility of fermentation effecting amodification in the lipid carbon chain to reduce its melting point and thereby act directly onone of the main technical barriers to obtaining biodiesel from this abundant source of lipids.Pork fatty waste was obtained from slaughterhouses in southern Brazil during eviscerationof the carcasses and the kidney casing of slaughtered animals was used as feedstock. Fer-mentation was performed in BHI broth with different concentrations of fatty waste and fordifferent time periods which enabled evaluation of the effect of fermentation time on themelting point of swine fat. The lowest melting point was observed around 46◦C, indicatingthat these chemical and biological reactions can occur under milder conditions, and thatsuch pre-treatment may further facilitate production of biodiesel from fatty animal waste.© 2016 Sociedade Brasileira de Microbiologia. Published by Elsevier Editora Ltda. This isan open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).