Characterization of extremely thermostable enzymatic breakers (α-1,6-galactosidase and β-1,4-mannanase) from the hyperthermophilic bacterium Thermotoga neapolitana 5068 for hydrolysis of guar gum

2000 ◽  
Vol 52 (2) ◽  
pp. 332-339 ◽  
Author(s):  
Carol M. McCutchen ◽  
Guy D. Duffaud ◽  
Pascal Leduc ◽  
Anja R. H. Petersen ◽  
Akash Tayal ◽  
...  
Keyword(s):  
Guar Gum ◽  
Thermotoga Neapolitana ◽  
Hyperthermophilic Bacterium ◽  
Hydrolysis Of

Characterization of an exo-acting intracellular α-amylase from the hyperthermophilic bacterium Thermotoga neapolitana

2009 ◽  
Vol 86 (2) ◽  
pp. 555-566 ◽  
Author(s):  
Kyung-Min Park ◽  
So-Young Jun ◽  
Kyoung-Hwa Choi ◽  
Kwan-Hwa Park ◽  
Cheon-Seok Park ◽  
...  
Keyword(s):  
Thermotoga Neapolitana ◽  
Hyperthermophilic Bacterium

scholarly journals Coregulation of beta-galactoside uptake and hydrolysis by the hyperthermophilic bacterium Thermotoga neapolitana

1997 ◽  
Vol 63 (3) ◽  
pp. 969-972
Author(s):  
MY Galperin ◽  
KM Noll ◽  
AH Romano
Keyword(s):  
Active Transport ◽  
Transport System ◽  
Metabolic Energy ◽  
Free Sugar ◽  
Thermotoga Neapolitana ◽  
Inducer Exclusion ◽  
Hyperthermophilic Bacterium ◽  
Active Transport System ◽  
Hydrolysis Of ◽  
Beta Galactosidase

Regulation of the beta-galactoside transport system in response to growth substrates in the extremely thermophilic anaerobic bacterium Thermotoga neapolitana was studied with the nonmetabolizable analog methyl-beta-D-thiogalactopyranoside (TMG) as the transport substrate. T. neapolitana cells grown on galactose or lactose accumulated TMG against a concentration gradient in an intracellular free sugar pool that was exchangeable with external galactose or lactose and showed induced levels of beta-galactosidase. Cells grown on glucose, maltose, or galactose plus glucose showed no capacity to accumulate TMG, though these cells carried out active transport of the nonmetabolizable glucose analog 2-deoxy-D-glucose. Glucose neither inhibited TMG uptake nor caused efflux of preaccumulated TMG; rather, glucose promoted TMG uptake by supplying metabolic energy. These data show that beta-D-galactosides are taken up by T. neapolitana via an active transport system that can be induced by galactose or lactose and repressed by glucose but which is not inhibited by glucose. Thus, the phenomenon of catabolite repression is present in T. neapolitana with respect to systems catalyzing both the transport and hydrolysis of beta-D-galactosides, but inducer exclusion and inducer expulsion, mechanisms that regulate permease activity, are not present. Regulation is manifest at the level of synthesis of the beta-galactoside transport system but not in the activity of the system.

scholarly journals Pretreatment of Switchgrass for Production of Glucose via Sulfonic Acid-Impregnated Activated Carbon

Processes ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 504
Author(s):  
Yane Ansanay ◽  
Praveen Kolar ◽  
Ratna Sharma-Shivappa ◽  
Jay Cheng ◽  
Consuelo Arellano
Keyword(s):  
Activated Carbon ◽  
Sulfonic Acid ◽  
Solid Acid ◽  
Methanesulfonic Acid ◽  
Biofuel Production ◽  
Acid Catalysts ◽  
Effects Of Temperature ◽  
Carbon Catalysts ◽  
Hydrolysis Of

In the present research, activated carbon-supported sulfonic acid catalysts were synthesized and tested as pretreatment agents for the conversion of switchgrass into glucose. The catalysts were synthesized by reacting sulfuric acid, methanesulfonic acid, and p-toluenesulfonic acid with activated carbon. The characterization of catalysts suggested an increase in surface acidities, while surface area and pore volumes decreased because of sulfonation. Batch experiments were performed in 125 mL serum bottles to investigate the effects of temperature (30, 60, and 90 °C), reaction time (90 and 120 min) on the yields of glucose. Enzymatic hydrolysis of pretreated switchgrass using Ctec2 yielded up to 57.13% glucose. Durability tests indicated that sulfonic solid-impregnated carbon catalysts were able to maintain activity even after three cycles. From the results obtained, the solid acid catalysts appear to serve as effective pretreatment agents and can potentially reduce the use of conventional liquid acids and bases in biomass-into-biofuel production.

scholarly journals Physical and self–crosslinking mechanism and characterization of Chitosan-Gelatin-Oxidized Guar gum hydrogel

2021 ◽  
pp. 107155
Author(s):  
Sayoni Maiti ◽  
Pritisha S. Khillar ◽  
Debasish Mishra ◽  
N. Arunai Nambiraj ◽  
Amit K. Jaiswal
Keyword(s):  
Guar Gum

Characterization of endogenous endopeptidases and exopeptidases and application for the limited hydrolysis of peanut proteins

2021 ◽  
Vol 345 ◽  
pp. 128764
Author(s):  
Yeming Chen ◽  
Hongsheng Zhang ◽  
Caimeng Zhang ◽  
Xiangzhen Kong ◽  
Yufei Hua
Keyword(s):  
Peanut Proteins ◽  
Hydrolysis Of

scholarly journals Multifunctional Biodegradable Vascular PLLA Scaffold with Improved X-ray Opacity, Anti-Inflammation, and Re-Endothelization

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 1979
Author(s):  
Ho In Lee ◽  
Yun Heo ◽  
Seung-Woon Baek ◽  
Da-Seul Kim ◽  
Duck Hyun Song ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Inflammatory Responses ◽  
Neointimal Hyperplasia ◽  
Film Surface ◽  
High Mechanical Property ◽  
X Ray ◽  
Stent Restenosis ◽  
X Ray Computed ◽  
Hydrolysis Of

Poly(L-lactic acid) (PLLA) has been used as a biodegradable vascular scaffold (BVS) material due to high mechanical property, biodegradability, and biocompatibility. However, acidic byproducts from hydrolysis of PLLA reduce the pH after the surrounding implanted area and cause inflammatory responses. As a result, severe inflammation, thrombosis, and in-stent restenosis can occur after implantation by using BVS. Additionally, polymers such as PLLA could not find on X-ray computed tomography (CT) because of low radiopacity. To this end, here, we fabricated PLLA films as the surface of BVS and divided PLLA films into two coating layers. At the first layer, PLLA film was coated by 2,3,5-triiodobenzoic acid (TIBA) and magnesium hydroxide (MH) with poly(D,L-lactic acid) (PDLLA) for radiopaque and neutralization of acidic environment, respectively. The second layer of coated PLLA films is composed of polydopamine (PDA) and then cystamine (Cys) for the generation of nitric oxide (NO) release, which is needed for suppression of smooth muscle cells (SMCs) and proliferation of endothelial cells (ECs). The characterization of the film surface was conducted via various analyses. Through the surface modification of PLLA films, they have multifunctional abilities to overcome problems of BVS effectively such as X-ray penetrability, inflammation, thrombosis, and neointimal hyperplasia. These results suggest that the modification of biodegradable PLLA using TIBA, MH, PDA, and Cys will have important potential in implant applications.

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