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Determination of Bioethanol Production from Apricot (Prunus armeniaca) Pomace

HIGHLIGHTS

Bioethanol production from apricot pomace was reported for the first time.

Dilute acid and enzymatic hydrolyses can efficiently saccharify the apricot pomace.

The washing step increased the fermentation efficiency significantly.

The maximum ethanol was observed as 30.09 g/L from 20% washed apricot pomace.

Abstract

Fruit juice industry generates massive amount of lignocellulosic by-products annually which are excellent raw materials for bioethanol production. In the current study, bioethanol production from apricot (Prunus armeniaca) pomace by Kluyveromyces marxianus was investigated for the first time. Some key parameters for fermentation such as pretreatment methods, biomass and cellulase loading and time, were optimized. Kluyveromyces marxianus produced 30.09 g/L ethanol in the 20% washed apricot pomace and 120 FPU/g cellulose enzyme loading. The highest theoretical yield and YP/S values were also observed as 94.7% and 0.50 g/g, respectively, when 15 FPU/g cellulose enzyme was used. These results depict that apricot pomace is a promising feedstock for bioethanol production.

Keywords:
Kluyveromyces marxianus; renewable energy; biofuel; ethanolegenic yeast

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