Naslov
Walnut shells as a promising new source of xylan- derived functional supplements

Autori
Vojvodić Cebin, Aleksandra ; Karača, Sara ; Belščak-Cvitanović, Ana ; Bušić, Arijana ; Komes, Draženka

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of abstracts of the 10th International Scientific and Professional Conference "With Food to Health" / Šubarić, Drago ; Jašić, Midhat - Osijek : Prehrambeno tehnološki fakultet Sveučilišta Josipa Jurja Strossmayera u Osijeku, 2017, 60-60

ISBN
978-953-7005-49-8

Skup
With Food to Health

Mjesto i datum
Osijek, Hrvatska, 12.10.2017. - 13.10.2017

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
delignification, hemicellulose, PMP-derivatization, xylan, walnut shell

Sažetak
Walnut shell is a lignocellulosic by-product material mainly used for combustion or as an abrasive. Due to the high content of xylan-type hemicellulose, it might be regarded as a promising novel source of xylan-derived functional products from renewable sources, such as xylooligosaccharides. The aim of this study was to determine the impact of delignification and varying alkali concentration on the extractability of xylan from walnut shells. Hemicellulose recovery was carried out by combining alkaline extraction (2M and 4M KOH + 20 mM NaBH4, for 4 h) with or without sodium chlorite-acetic acid delignification pretreatment (2 h or 4 h). The obtained fractions consisted of soluble and insoluble hemicellulose and insoluble cellulosic residue. The respective yields were determined gravimetrically, while their monomeric composition was determined by HPLC- PDA with pre-column derivatization using 3- methyl-1-phenyl-2-pyrazoline-5-one (PMP). Delignification enabled a significant increase in total hemicellulose yield (2.5 - 2.8-fold, compared to non-delignified samples), with a maximum obtained yield of 28.8 % of the original sample dry weight. Delignification time, as well as alkali concentration, only slightly influenced the yield. The highest total xylose recovery, 95 % of the initial content, was obtained for the 4 h delignified sample extracted for 4h with 4M KOH. It predominantly accounted for the extracted xylan (91.8 % of initially present xylose), of which 43 % was in insoluble form.

Izvorni jezik
Engleski

Znanstvena područja
Biotehnologija, Prehrambena tehnologija

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