Wheat bran biorefinery: an investigation on the starch derived glucose extraction accompanied by pre- and post-treatment steps.
Wheat bran, a side product of the milling industry, can be considered as a feedstock for biorefineries. Unlike other lignocellulosic feedstock, wheat bran contains a reasonable amount of starch, which is not of recalcitrant nature. Therefore, it can be extracted without a costly pretreatment process. The present work evaluates the extraction of starch derived glucose in relation to a wheat bran biorefinery. The purity of free glucose extracted quantitatively was 44%. The extract was concentrated by threefold via nanofiltration, thereby reaching a glucose concentration of 49 g/L. Hydrothermal treatment (180°C - 20 min) of the starch-free bran did not induce the formation of hydroxymethylfurfural and levulinic acid. Interestingly, the furfural level increased compared to the process, in which bran was treated hydrothermally without a preceding starch extraction. By separation of water-extractables prior to enzymatic hydrolysis, the free glucose purity was increased to 58%, however the yield of glucose decreased to 61%.
Department of Food Science and Technology, University for Natural Resources and Life Sciences, Muthgasse 18, 1190 Vienna, Austria; Christian Doppler Research Laboratory for Innovative Bran Biorefinery, Muthgasse 18, 1190 Vienna, Austria. Electronic address: oezge.tirpanalan@boku.ac.at.
Özge
Ö
Tirpanalan
Department of Food Science and Technology, University for Natural Resources and Life Sciences, Muthgasse 18, 1190 Vienna, Austria; Christian Doppler Research Laboratory for Innovative Bran Biorefinery, Muthgasse 18, 1190 Vienna, Austria.
Michael
M
Reisinger
Department of Food Science and Technology, University for Natural Resources and Life Sciences, Muthgasse 18, 1190 Vienna, Austria; Christian Doppler Research Laboratory for Innovative Bran Biorefinery, Muthgasse 18, 1190 Vienna, Austria.
Florian
F
Huber
Department of Food Science and Technology, University for Natural Resources and Life Sciences, Muthgasse 18, 1190 Vienna, Austria; Christian Doppler Research Laboratory for Innovative Bran Biorefinery, Muthgasse 18, 1190 Vienna, Austria.
Wolfgang
W
Kneifel
Department of Food Science and Technology, University for Natural Resources and Life Sciences, Muthgasse 18, 1190 Vienna, Austria; Christian Doppler Research Laboratory for Innovative Bran Biorefinery, Muthgasse 18, 1190 Vienna, Austria.
Senad
S
Novalin
D005374:Filtration; D005947:Glucose / Q000302:isolation & purification*; D008567:Membranes, Artificial; D013213:Starch / Q000737:chemistry*; D014908:Triticum / Q000737:chemistry*
D008567:Membranes, Artificial; D013213:Starch; D005947:Glucose
Biorefinery; Glucose extraction; Hydroxymethylfurfural; Nanofiltration; Wheat bran