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Bibliographic record number: 899574


Authors: Vojvodić Cebin, Aleksandra; Karača, Sara; Belščak-Cvitanović, Ana; Bušić, Arijana; Komes, Draženka
Title: Walnut shells as a promising new source of xylan- derived functional supplements
Source: Book of abstracts of the 10th International Scientific and Professional Conference "With Food to Health" / Šubarić, Drago ; Jašić, Midhat (ed). - Osijek : Prehrambeno-tehnološki fakultet u Osijeku Sveučilište Josipa Jurja Strossmayera u Osijeku, Farmaceutski fakultet Univerziteta u Tuzli , 2017. 60-60 (ISBN: 978-953-7005-49-8).
ISSN: 2232-9536
Meeting: With Food to Health
Location and date: Osijek, Hrvatska, 12-13.10.2017.
Keywords: delignification, hemicellulose, PMP-derivatization, xylan, walnut shell
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.
Type of meeting: Poster
Type of presentation in a journal: Abstract
Type of peer-review: International peer-review
Project / theme: HRZZ-IP-2013-11-9158
Original language: ENG
Category: Znanstveni
Research fields:
Biotechnology,Food processing technology
Contrib. to CROSBI by: Sara Karača (, 18. Lis. 2017. u 08:13 sati

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