Abstract：
:Alginate was evaluated as an immobilization matrix for enzyme-catalyzed reactions in organic solvents. In contrast to most hydrogels, calcium alginate was found to be stable in a range of organic solvents and to retain the enzyme inside the gel matrix. In hydrophobic solvents, the alginate gel (greater than 95% water) thus provided a stable, two-phase liquid system. The lipase from Candida cylindracea, after immobilization in alginate beads, catalysed esterification and transesterification in n-hexane under both batch and continuous-flow conditions. The operational stability of the lipase was markedly enhanced by alginate entrapment. In the esterification of butanoic acid with n-butanol, better results were obtained in the typical hydrophilic calcium alginate beads than in less hydrophilic matrices. The effects of substrate concentration, matrix area, and polarity of the substrate alcohols and of the organic solvent on the esterification activity were examined. The transesterification of octyl 2-bromopropanoate with ethanol was less efficient than that of ethyl 2-bromopropanoate with octanol. By using the hydrophilic alginate gel as an immobilization matrix in combination with a mobile hydrophobic phase, a two-phase liquid system was achieved with definite advantages for a continuous, enzyme-catalysed process.
journal_name
Enzyme Microb Technoljournal_title
Enzyme and microbial technologyauthors
Hertzberg S,Kvittingen L,Anthonsen T,Skjåk-Braek Gdoi
10.1016/0141-0229(92)90024-ikeywords:
subject
Has Abstractpub_date
1992-01-01 00:00:00pages
42-7issue
1eissn
0141-0229issn
1879-0909pii
0141-0229(92)90024-Ijournal_volume
14pub_type
杂志文章abstract：:A solvent-mediated method (SMM) was used to prepare supersaturated sugar solutions in hydrophobic and mixture of hydrophilic/hydrophobic ionic liquids (ILs), namely, [Bmim][Tf2N] and [Bmim][TfO]/[Bmim][Tf2N], respectively. In this method, sugars were first solubilized in a mixture of organic solvent and water (i.e. me...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2019.03.004
更新日期：2019-07-01 00:00:00
abstract：:We report a new colorimetric assay to quantify endo-polygalacturonase activity, which hydrolyzes polygalacturonic acid to produce smaller chains of galacturonate. Some of the reported polygalacturonase assays measure the activity by detecting the appearance of reducing ends such as the Somogyi-Nelson method. As a resu...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2010.04.004
更新日期：2011-02-08 00:00:00
abstract：:6-(N-hydroxyethyl)-amino-6-deoxy-l-sorbofuranose (6NSL), a key precursor in the synthesis of miglitol, is produced from N-2-hydroxyethyl-glucamine (NHEG) by the regioselective oxidation of Gluconobacter oxydans. The limitation of PQQ biosynthesis became a bottleneck for improvement of PQQ-dependent D-sorbitol dehydrog...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2020.109670
更新日期：2020-11-01 00:00:00
abstract：:In the paper, a green and efficient biosynthetical technique was reported for preparing cadmium sulfide (CdS) quantum dots, in which Escherichia coli (E. coli) was chosen as a biomatrix. Fluorescence emission spectra and fluorescent microscopic photographs revealed that as-produced CdS quantum dots had an optimum fluo...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2016.09.017
更新日期：2017-01-01 00:00:00
abstract：:The cellulase and xylanase genes of filamentous Trichoderma fungi exist under carbon catabolite repression mediated by the regulator carbon catabolite repressor (CREI). Our objective was to find the role of CREI in a cellulase-hyperproducing mutant of Trichoderma koningii, and address whether enzyme production can be ...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2013.04.007
更新日期：2013-07-10 00:00:00
abstract：:An intracellular alcohol oxidase (AOX) was isolated from the white-rot basidiomycete Phanerochaete chrysosporium (Pch), grown on l-lactate induction medium, and purified to electrophoretic homogeneity. The dimeric protein consisted of two identical 75kDa subunits. The open reading frame of 1,956bp resulted in a monome...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2014.04.001
更新日期：2014-07-01 00:00:00
abstract：:Turanose is a natural isomer of sucrose. It is an emerging functional sweetener of the next generation. Turanose is catalytically synthesized from the sucrose biomass by employing amylosucrase enzyme. In this study, a novel gene encoding amylosucrase (Asmet) has been identified from the metagenome of a thermal aquatic...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2019.109372
更新日期：2019-12-01 00:00:00
abstract：:Peptide T has a sequence (Ala-Ser-Thr-Thr-Thr-Asn-Tyr-Thr) belonging to HIV envelope that is involved in the interaction with CD(4) receptor of T lymphocytes. Research of protease activities towards this peptide is very relevant for AIDS therapy. Characterization of specificity of subtilisin Carlsberg towards this ver...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/s0141-0229(99)00170-2
更新日期：2000-03-01 00:00:00
abstract：:Supercritical fluids offer environmental advantages over chemical solvents, while providing enhanced separation and chemical selectivity. The use of supercritical fluids for the recovery of products from biomass and the transformation of selected molecules (to add value) was studied. Free fatty acids were bio-catalyti...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2011.07.004
更新日期：2011-09-10 00:00:00
abstract：:The selected thermotolerant, lactose-utilizing yeast strain Kluyveromyces marxianus NBIMCC 8362 possesses high specific d-amino acid oxidase activity (60Ug(-1)), which was increased nine-fold (545Ug(-1)) by design of the growth medium and conditions for d-amino oxidase induction. Applying an optimized simple and rapid...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2007.08.010
更新日期：2008-01-01 00:00:00
abstract：:l-asparaginase is a pharmaceutically and industrially important enzyme as it has potential to treat different cancers and inhibit acrylamide formation in fried and baked food products. In the present study, an attempt was made to screen for new and novel l-asparaginase producers using a widely applied phenol red and b...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2017.08.004
更新日期：2017-12-01 00:00:00
abstract：:A lipase, LipG7, has been purified from the Antarctic filamentous fungus Geomyces sp. P7 which was found to be cold-adapted and able to retain/regain its activity after heat denaturation. The LipG7 exhibits 100% residual activity following 1h incubation at 100°C whilst simultaneously showing kinetic adaptations to col...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2013.03.021
更新日期：2013-06-10 00:00:00
abstract：:Various recombinant proteins can be produced by the yeast Saccharomyces cerevisiae cell factories; therefore, efficient recombinant protein production techniques are desirable. In this study, to establish an efficient recombinant protein production technique in S. cerevisiae, the secretory production of recombinant pr...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2018.10.014
更新日期：2019-02-01 00:00:00
abstract：:Solid-liquid enzyme reactions constitute important processes in biochemical industries. The isomerization of d-glucose to d-fructose, using the immobilized glucose isomerase (Sweetzyme T), as a typical example of solid-liquid catalyzed reactions has been carried out in one stage and multi-stage novel type of impinging...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2013.11.006
更新日期：2014-02-05 00:00:00
abstract：:The cell wall integrity and stress response component (WSC) domain was first described in the Wsc-family protein of the yeast Saccharomyces cerevisiae, and later found in diverse eukaryotic organisms. Due solely to their presence in the Wsc-family proteins working as a plasma membrane sensor for surface stress and in ...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2019.02.009
更新日期：2019-06-01 00:00:00
abstract：:Anthocyanin production by strawberry cells depends not only on light intensity but also on the light/dark cycle operation with hour- or second-scale periods. These findings are useful for designing and operating photobioreactors for enhanced anthocyanin production. Intermittent illumination with a second-scale period ...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/s0141-0229(00)00143-5
更新日期：2000-05-01 00:00:00
abstract：:The primary aim of this study was to decipher the catalytic functions of the NHase with wide substrate spectra from Rhodococcus ruber CGMCC3090 by computer modeling and substrate docking. 3D structure model of the enzyme was built by computer modeling to obtain the optimal structure. The larger binding site cavity (55...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2012.11.004
更新日期：2013-02-05 00:00:00
abstract：:Direct cellobiose production from cellulose by a genetically modified fungus-Neurospora crassa, was explored in this study. A library of N. crassa sextuple beta-glucosidase (bgl) gene deletion strains was constructed. Various concentrations of cellobiose were detected in the culture broth of the N. crassa sextuple bet...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2012.12.010
更新日期：2013-03-05 00:00:00
abstract：:Kinetic resolution of sec-alcohols is a green process with biocatalyst. Candida antarctica lipase B (CALB) displayed on Pichia pastoris cell-surface (Pp-CALB) was characterized in kinetic resolution of sec-alcohols with different structures. The reaction parameters including acyl donors, molar ratio of substrates, sol...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2017.11.005
更新日期：2018-03-01 00:00:00
abstract：:In the present investigation, the bacterium Escherichia coli (VM1) was isolated from a marine sediments of Ennore coastal water along southeast coast of India was exploited for its capability of Ag NPs synthesis. The derived nanoparticles were characterized employing ultraviolet-visible (UV-vis) spectroscopy, Fourier ...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2016.09.008
更新日期：2016-12-01 00:00:00
abstract：:Water-insoluble nucleases were prepared by immobilizing the endonuclease from S. aureus onto the surface of nylon-66 and polystyrene spheres. The activation phase of the synthetic supports was optimized to define optimal conditions of pH, temperature, and Ca2+ concentration for using immobilized enzymes. The activity,...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/0141-0229(93)90140-w
更新日期：1993-03-01 00:00:00
abstract：:Different carbon sources affecting growth and lipase production in Candida rugosa were studied by using batch cultures on defined medium. Carbohydrates and acids non-related to fats did not induce lipase production. The highest yields of enzyme were obtained with lipids or fatty acids as carbon sources. Tween 80 stimu...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/s0141-0229(00)00156-3
更新日期：2000-06-01 00:00:00
abstract：:2,5-Bis(hydroxymethyl)furan (BHMF) is a versatile building block in the synthesis of polymers, fuels, and macrocycle polyethers. In this work, alcohol dehydrogenases (ADHs) were identified from Meyerozyma guilliermondii SC1103 and were heterologously expressed in Saccharomyces cerevisiae for the synthesis of BHMF from...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2019.109491
更新日期：2020-03-01 00:00:00
abstract：:Chemical modification of lysine residues in two bacterial alpha-amylases, a mesophilic enzyme from Bacillus amyloliquefaciens (BAA) and a thermophilic enzyme from Bacillus licheniformis (BLA) was carried out using citraconic anhydride. 13 +/- 1 residues in BAA and 10 +/- 1 residues in BLA were found modified under def...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/s0141-0229(01)00296-4
更新日期：2001-04-05 00:00:00
abstract：:A method to stably immobilize microbes on electrodes was developed. Resting cells of Methylobacterium extorquens AM1(MeAM1) were caged within multiwalled carbon nanotubes (MWNTs)by adding the cells to a water dispersion of MWNTs then allowing the resulting mixture to dry on electrodes. The MeAM1-MWCNTs electrode thus ...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2018.06.004
更新日期：2018-10-01 00:00:00
abstract：:Cytochrome P450 enzyme preparations were obtained from phenobarbital-treated rats. On immobilization in Romicon PM 10 polysulfone anisotropic hollow fibers, 20-25% of the original activity remained. The immobilization procedure did not significantly alter the Km of the preparations when 7-ethoxycoumarin was the substr...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/0141-0229(93)90031-v
更新日期：1993-02-01 00:00:00
abstract：:GH11 xylanase XynJ from Bacillus sp. strain 41M-1 has a β-jellyroll fold composed of eight β strands with a deep active-site cleft. We hypothesized that the thermostability of XynJ will increase if the flexibility of the β strands in the jellyroll structure is decreased without impairing activity. To verify this hypot...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2019.109363
更新日期：2019-11-01 00:00:00
abstract：:Zymomonas mobilis genes encoding INVA and INVB were expressed in Pichia pastoris, under the control of the strong AOX1 promoter, and the recombinant enzymes were named INVAAOX1 and INVBAOX1. The expression levels of INVAAOX1 (1660 U/mg) and INVBAOX1 (1993 U/mg) in P. pastoris were 9- and 7-fold higher than those obser...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2015.11.008
更新日期：2016-02-01 00:00:00
abstract：:Based on a differential pre-screening of 44 white-rot fungi on a lignocellulose-supplemented minimal medium, four basidiomycetes were selected for further study: Ganoderma lucidum, Polyporus brumalis, Polyporus ciliatus and Trametes versicolor. Only G. lucidum was able to grow vividly on malt extract or minimal media ...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/j.enzmictec.2013.08.003
更新日期：2013-12-10 00:00:00
abstract：:Horseradish peroxidase (HRP) was successfully purified from horseradish roots by a two-stage reverse-micellar extraction from the dialyzed aqueous extract. The anionic surfactant AOT dissolved in isooctane was used to produce the reverse-micellar phases. The narrow pH range at which HRP solubilization occurred was exp...
journal_title：Enzyme and microbial technology
pub_type： 杂志文章
doi：10.1016/0141-0229(95)00031-3
更新日期：1996-04-01 00:00:00
