D-Xylonic Acid Utilization by Bifidobacteria

1995 ◽  
Vol 14 (1) ◽  
pp. 15-17 ◽  
Author(s):  
Hiroko NODA ◽  
Masahiro OHSUGI
Keyword(s):  
Xylonic Acid

A pH-responsive genetic sensor for the dynamic regulation of D-xylonic acid accumulation in Escherichia coli

2020 ◽  
Vol 104 (5) ◽  
pp. 2097-2108
Author(s):  
Angelo B. Bañares ◽  
Kris Niño G. Valdehuesa ◽  
Kristine Rose M. Ramos ◽  
Grace M. Nisola ◽  
Won-Keun Lee ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Ph Responsive ◽  
Dynamic Regulation ◽  
Xylonic Acid ◽  
Acid Accumulation

PREPARATION OF 1-C14 PENTONIC ACIDS BY THE CYANHYDRIN SYNTHESIS

1954 ◽  
Vol 32 (4) ◽  
pp. 334-339 ◽  
Author(s):  
A. C. Neish
Keyword(s):  
Equimolar Amount ◽  
Radioactive Carbon ◽  
Xylonic Acid

Solutions of pure D-threose and D-erythrose, buffered with bicarbonate (0.82 moles) plus carbonate (0.18 moles), were treated with an equimolar amount of C14-labeled KCN. The aldonic acids were isolated as salts, using carrier technique, in yields of 90–95% based on the radioactive carbon. D-Erythrose gave 1.89 times as much arabonic as ribonic acid while D-threose gave 2.36 times as much lyxonic as xylonic acid. Despite the unfavorable ratio in the latter case it was found that D-xylose could be obtained in an over-all yield of 22%, based on the cyanide.

scholarly journals Catalytic valorization of hardwood for enhanced xylose-hydrolysate recovery and cellulose enzymatic efficiency via synergistic effect of Fe3+ and acetic acid

2019 ◽  
Vol 12 (1) ◽  
Author(s):  
Kaixuan Huang ◽  
Lalitendu Das ◽  
Jianming Guo ◽  
Yong Xu
Keyword(s):  
Acetic Acid ◽  
Synergistic Effect ◽  
Paper Industry ◽  
Enzymatic Saccharification ◽  
Value Added ◽  
Lewis Acid Site ◽  
Aqueous Acetic Acid ◽  
Xylan Degradation ◽  
Hydrolysis Process ◽  
Xylonic Acid

Abstract Background Poplars are considered suitable dedicated energy crops, with abundant cellulose and hemicellulose, and huge surplus biomass potential in China. Xylan, the major hemicellulosic component, contributes to the structural stability of wood and represents a tremendous quantity of biobased chemicals for fuel production. Monomeric xylose conversion to value-added chemicals such as furfural, xylitol, and xylonic acid could greatly improve the economics of pulp-paper industry and biorefinery. Acetic acid (HAc) is used as a friendly and recyclable selective catalyst amenable to xylan degradation and xylooligosaccharides production from lignocellulosic materials. However, HAc catalyst usually works much feebly at inert woods than agricultural straws. In this study, effects of different iron species in HAc media on poplar xylan degradation were systematically compared, and a preferable Fe3+-assisted HAc hydrolysis process was proposed for comparable xylose-hydrolysate recovery (XHR) and enzymatic saccharification of cellulose. Results In presence of 6.5% HAc with 0.17–0.25 wt% Fe3+, xylose yield ranged between 72.5 and 73.9%. Additionally, pretreatment was effective in poplar delignification, with a lignin yield falling between 38.6 and 42.5%. Under similar conditions, saccharification efficiency varied between 60.3 and 65.9%. Starting with 100 g poplar biomass, a total amount of 12.7–12.8 g of xylose and 18.8–22.8 g of glucose were harvested from liquid streams during the whole process of Fe3+-HAc hydrolysis coupled with enzymatic saccharification. Furthermore, the enhancement mechanism of Fe3+ coupled with HAc was investigated after proof-of-concept experiments. Beechwood xylan and xylose were treated under the same condition as poplar sawdust fractionation, giving understanding of the effect of catalysts on the hydrolysis pathway from wood xylan to xylose and furfural by Fe3+-HAc. Conclusions The Fe3+-assisted HAc hydrolysis process was demonstrated as an effective approach to the wood xylose and other monosaccharides production. Synergistic effect of Lewis acid site and aqueous acetic acid provided a promising strategy for catalytic valorization of poplar biomass.

Production of D-Xylonic Acid from Hemicellulose Using Artificial Enzyme Complexes

2017 ◽  
Vol 27 (1) ◽  
pp. 77-83 ◽  
Author(s):  
Charles C. Lee ◽  
Rena E. Kibblewhite ◽  
Chad D. Paavola ◽  
William J. Orts ◽  
Kurt Wagschal
Keyword(s):  
Artificial Enzyme ◽  
Xylonic Acid ◽  
Enzyme Complexes

scholarly journals Ethylene glycol and glycolic acid production from xylonic acid by Enterobacter cloacae

2020 ◽  
Vol 19 (1) ◽  
Author(s):  
Zhongxi Zhang ◽  
Yang Yang ◽  
Yike Wang ◽  
Jinjie Gu ◽  
Xiyang Lu ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Acid Production ◽  
Glycolic Acid ◽  
Enterobacter Cloacae ◽  
Xylonic Acid

Bioconversion of xylose to xylonic acid via co-immobilized dehydrogenases for conjunct cofactor regeneration

2019 ◽  
Vol 93 ◽  
pp. 102747 ◽  
Author(s):  
Karolina Bachosz ◽  
Karol Synoradzki ◽  
Maciej Staszak ◽  
Manuel Pinelo ◽  
Anne S. Meyer ◽  
...  
Keyword(s):  
Cofactor Regeneration ◽  
Xylonic Acid

scholarly journals Resolving the formidable barrier of oxygen transferring rate (OTR) in ultrahigh-titer bioconversion/biocatalysis by a sealed-oxygen supply biotechnology (SOS)

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Xia Hua ◽  
Xin Zhou ◽  
GenLai Du ◽  
Yong Xu
Keyword(s):  
Oxygen Supply ◽  
Chemical Engineering ◽  
Gluconobacter Oxydans ◽  
Critical Issue ◽  
High Density ◽  
Chemical Production ◽  
Oxygen Utilization ◽  
Whole Cell ◽  
Xylonic Acid ◽  
Whole Cell Catalysis

Abstract Background The critical issue in the competitiveness between bioengineering and chemical engineering is the products titer and the volume productivity. The most direct and effective approach usually employs high-density biocatalyst, while the weakened mass transfer and evoked foam problem accompany ultrahigh-density biocatalyst loading and substrate/product titer. In high-density obligate aerobic bioconversion, oxygen as electron acceptor is a speed-limiting step in bioprocesses, but sufficient oxygen supply will lead to the foaming which results in a significant reduction in oxygen utilization and the use of additional defoamers. In this study, we designed a novel sealed-oxygen supply (SOS) biotechnology to resolve the formidable barrier of oxygen transferring rate (OTR), for bio-based fuels and chemical production process. Results Based on systemic analysis of whole-cell catalysis in Gluconobacter oxydans, a novel sealed-oxygen supply technology was smartly designed and experimentally performed for biocatalytic oxidation of alcohols, sugars and so on. By a simple operation skill of automatic online supply of oxygen in a sealed stirring tank bioreactor of SOS, OTR barrier and foaming problem was resolved with great ease. We finally obtained ultrahigh-titer products of xylonic acid (XA), 3-hydroxypropionic acid (3-HPA), and erythrulose at 588.4 g/L, 69.4 g/L, and 364.7 g/L, respectively. Moreover, the volume productivity of three chemical products was improved by 150–250% compared with normal biotechnology. This SOS technology provides a promising approach to promote bioengineering competitiveness and advantages over chemical engineering. Conclusion SOS technology was demonstrated as an economic and universally applicable approach to bio-based fuels and chemicals production by whole-cell catalysis. The novel technology greatly promotes the competitiveness of bioengineering for chemical engineering, and provides a promising platform for the green and environmental use of biofuels.

Effect of Physical Parameters on Production of ᴅ-Xylonic Acid using Recombinant E. coli BL21 (DE3)

2019 ◽  
Vol 19 ◽  
pp. 1247-1254
Author(s):  
N.A.M. Rodzri ◽  
W.S.W.M. Zain ◽  
R.M.A. Hanapiah ◽  
R.A. Samah ◽  
R.M. Illias
Keyword(s):  
Physical Parameters ◽  
E Coli ◽  
Xylonic Acid

Production of xylonic acid byPseudomonas fragi

1986 ◽  
Vol 8 (8) ◽  
pp. 541-546 ◽  
Author(s):  
J. Buchert ◽  
L. Viikari ◽  
M. Linko ◽  
P. Markkanen
Keyword(s):  
Xylonic Acid
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