Improvement of enzymatic xylooligosaccharides production by the co-utilization of xylans from different origins

Kiran, Esra Uckun
Bakir, Ufuk
This study aimed to improve XOs production by enzymatic hydrolysis of xylans from various lignocellulosic waste biomasses namely corn cob, cotton and sunflower stalks, rice hull, wheat straw by using two commercial xylanase preparations, Shearzyme 500L and Veron 191. Shearzyme 500L showed better xylan hydrolysis capacity with high amount of xylose liberation. Xylobiose was the main hydrolysis product in each case. Even though the enzymatic hydrolyses using Shearzyme 500L resulted higher reducing sugar production compared to those of Veron 191, the hydrolysis of complex xylan structures was improved and the production of undesirable xylose was lowered by the co-utilization of xylanase preparations. By the co-utilization of xylanase preparations, the reducing sugar production from wheat straw, corn cob and sunflower stalk originated xylans was increased by 36%, 33% and 13%, respectively, compared to the expected reducing sugar yields. The highest reducing sugar production was obtained from complex corn cob xylan. The depolymerization of cotton and sunflower stalk xylan was poorest even though they have simple structures. Poor utilization of these xylans might be related to their high residual lignin content which might hinder the accessibility of xylan by the xylanases. However, the utilization of sunflower and cotton stalk xylan was improved when they were hydrolyzed within a xylan mixture containing equal amounts of each of five different xylans. In short, XOs production efficiency from agricultural waste materials was improved by the co-utilization of suitable xylanase and/or xylan mixtures considering the heterogeneous structures of xylan and different substrate specificities of xylanases. (C) 2013 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.


Şümnü, Servet Gülüm (Wiley, 1994-08-01)
Pears were coated with different concentrations of Semperfresh or with Johnfresh edible coatings after storage for five months at 0C to determine the effects of coatings on poststorage quality. Coating levels were effective for extending the poststorage life and delaying ripening. Both Semperfresh and Johnfresh treated pears had better color, firmness, ascorbic acid, titratable acidity, soluble solid retention than control pears. Although Semperfresh was effective for the reduction of respiration and weight...
Functionality of batters containing different starch types for deep-fat frying of chicken nuggets
Altunakar, B; Şahin, Serpil; Şümnü, Servet Gülüm (Springer Science and Business Media LLC, 2004-03-01)
The effect of various starch types (amylomaize, corn, waxymaize, pregelatinized tapioca) on quality attributes (texture, moisture content, oil content, color, coating pick up, cooking yield, volume and porosity) of deep-fat fried chicken nuggets were studied. Chicken samples, 0.04 m in diameter and 0.015 m in thickness, taken from the breast portion, were coated with batters composed of a 3:5 solid to water ratio by immersion. The solid content of batter formulations contained equal amounts of corn and whea...
Optimization of bread baking in a halogen lamp-microwave combination oven by response surface methodology
Demirekler, P; Şümnü, Servet Gülüm; Şahin, Serpil (Springer Science and Business Media LLC, 2004-09-01)
The main objective of this study was to optimize the baking conditions of bread in a halogen lamp-microwave combination oven. Independent variables were the baking time (4, 4.5, 5, 5.5, and 6 min), the power of the microwaves (20, 30, 40, 50, and 60%), and the power of the upper and lower halogen lamps (40, 50, 60, 70, and 80%). The quality parameters measured were the weight loss, the color, the specific volume, the porosity, and the texture profile of the breads. For the optimization, the response surface...
ALTI, M; OZILGEN, M (Wiley, 1994-09-01)
Statistical analysis of broiler feed production was done with data obtained in an industrial plant in an attempt to characterise the causes of variations in feed composition. Analysis of the experimental data has shown that the feed conversion ratio (FCR) for broilers was between 1.8 and 2.5. This large range of observations were thought to be caused by the wide range of variations in the composition of the feeds. The major factor contributing to the variance of the feed compositions was the variance of the...
Determination of oil and moisture distribution in fried potatoes using magnetic resonance imaging
ISIK, Betul; Şahin, Serpil; Öztop, Halil Mecit (Wiley, 2018-10-01)
The objective of this study was to examine oil and moisture distribution in fried potatoes using Magnetic Resonance Imaging (MRI) as nondestructive technique and to establish a correlation between moisture content and oil content of fried potatoes with MRI results. In addition, it was aimed to evaluate the effects of frying time, predrying and precoating by hydroxyprophylmethylcellulose (HPMC) on moisture loss and oil uptake of the samples. Coating with HPMC was the best pretreatment to reduce oil uptake. S...
Citation Formats
E. U. Kiran, Ö. AKPINAR, and U. Bakir, “Improvement of enzymatic xylooligosaccharides production by the co-utilization of xylans from different origins,” FOOD AND BIOPRODUCTS PROCESSING, pp. 565–574, 2013, Accessed: 00, 2020. [Online]. Available: