Abstract:
:R-lactide, a pivotal monomer for the production of poly (D-lactic acid) (PDLA) or stereocomplex poly (lactic acid) (PLA) was synthesized from alkyl (R)-lactate through a lipase-catalyzed reaction without racemization. From among several types of lipase, only lipase B from Candida antarctica (Novozym 435; CAL-B) was effective in the reaction that synthesized (R,R)-lactide. Enantiopure (R,R)-lactide, which consisted of over 99% enantiomeric excess, was synthesized from methyl (R)-lactate through CAL-B catalysis. Removal of the methanol by-product was critical to obtain a high level of lactide conversion. The (R,R)-lactide yield was 56% in a reaction containing 100 mg of Novozym 435, 10 mM methyl (R)-lactate and 1500 mg of molecular sieve 5A in methyl tert-butyl ether (MTBE). The important monomer (R,R)-lactide that is required for the production of the widely recognized bio-plastic PDLA and the PLA stereocomplex can be obtained using this novel synthetic method.
journal_name
J Biotechnoljournal_title
Journal of biotechnologyauthors
Jeon BW,Lee J,Kim HS,Cho DH,Lee H,Chang R,Kim YHdoi
10.1016/j.jbiotec.2013.06.021subject
Has Abstractpub_date
2013-10-20 00:00:00pages
201-7issue
2eissn
0168-1656issn
1873-4863pii
S0168-1656(13)00277-0journal_volume
168pub_type
杂志文章abstract::The effect of an additional carbon source, lactate, on Penicillium camembertii growth on glutamate as both carbon and nitrogen sources was examined. Glutamate (and lactate) was present in excess in both media. Throughout the whole culture, similar growth time-courses were recorded on both media, indicating the absence...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2004.07.007
更新日期:2004-11-09 00:00:00
abstract::Anion exchange membranes prepared by adsorption of polymers on Formed-In-Place microfiltration substrates were formed and ion-exchange separations of solutions containing two proteins were determined by ion exchange membrane sequential separation procedures, similar to affinity membrane separation procedures. Represen...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/0168-1656(92)90007-v
更新日期:1992-11-01 00:00:00
abstract::Biodegradable scaffolds are of great value in tissue engineering. We have developed a method for fabricating patient-specific vascular scaffolds from a biocompatible and biodegradable polymer, poly(L-lactide-co-epsilon-caprolactone). This method's usefulness is due to flexibility in the choice of materials and vascula...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2007.08.017
更新日期:2008-01-20 00:00:00
abstract::Rice straw is a by-product of rice production, and a great bioresource as raw biomass material for manufacturing value-adding protein for animal feedstock, which has been paid more and more attention. In the present work, utilizing rice straw hydrolysate as a substrate for microbial biomass production in 11.5L externa...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2005.04.022
更新日期:2005-09-10 00:00:00
abstract::A computer system solution for integration of a distributed bioreactor monitoring and control instrumentation on the laboratory scale is described. Bioreactors equipped with on-line analyzers for mass spectrometry, near-infrared spectroscopy, electrochemical probes and multi-array gas sensors and their respective soft...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/s0168-1656(03)00121-4
更新日期:2003-08-15 00:00:00
abstract::One hundred and seventy-eight new butanol-acetone producing bacteria related to saccharolytic clostridia were isolated from agricultural sources in Colombia and their fermentation potential was evaluated. Thirteen isolates produced more total solvents from glucose than Clostridium acetobutylicum ATCC 824. The isolates...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/s0168-1656(00)00218-2
更新日期:2000-04-28 00:00:00
abstract::In the present study we show that recombinant bacterial CotA-laccase from Bacillus subtilis is able to decolourise, at alkaline pH and in the absence of redox mediators, a variety of structurally different synthetic dyes. The enzymatic biotransformation of the azo dye Sudan Orange G (SOG) was addressed in more detail ...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2008.09.001
更新日期:2009-01-01 00:00:00
abstract::Our unpublished experimental results of fractional factorial experiments showed that the significant external factors affecting high pressure processing (HPP) inactivation were pressure, temperature and pressure holding time. Based on these results, response surface methodology (RSM) was employed in the present work a...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2006.03.004
更新日期:2006-09-18 00:00:00
abstract::The aim of the present study was to investigate the effect of three routine drug excipients, as osmolytes, in three different concentrations, on structure, thermal stability and the activity of single-chain (sc-) tenecteplase. To see the influence of trehalose, mannitol, and sucrose on the structure, stability and func...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2018.05.014
更新日期:2018-08-20 00:00:00
abstract::Cupriavidus nantongensis X1 is a chlorpyrifos degrading bacterium, which was isolated from sludge collected at the drain outlet of a chlorpyrifos manufacture plant. It is the first time to report the complete genome sequence of C. nantongensis species, which has been reported as a novel species of Cupriavidus genus. I...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2016.04.012
更新日期:2016-06-10 00:00:00
abstract::Spent refinery processing catalyst is listed as a hazardous waste; the toxicity characteristic leaching procedure (TCLP) extracts of the catalyst are found to contain heavy metals at concentrations exceeding the regulated levels. In the present investigation, Aspergillus niger was adapted to single metal ions Ni, Mo o...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2005.07.002
更新日期:2006-01-02 00:00:00
abstract::In concern with frequent recurrence of anthrax in endemic areas and inadvertent use of its spores as biological weapon, the development of an effective anthrax vaccine suitable for both human and veterinary needs is highly desirable. A simple oral delivery through expression in plant system could offer promising alter...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2014.01.033
更新日期:2014-04-20 00:00:00
abstract::Two affinity columns comprising immobilized concanavalin A (Con A), Con A-Sepharose and Con A-XP3507, were evaluated for their purifying ability for the glycoprotein allergen Ag7 from a partially purified extract of mugwort pollen. The most pronounced difference between the two columns was the nature of their nonspeci...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/0168-1656(90)90044-c
更新日期:1990-11-01 00:00:00
abstract::An alkalophilic bacterium was isolated based on the potential of extra-cellular enzymes for bioscouring. The bacterium was identified as a new strain of Bacillus pumilus BK2 producing an extra-cellular endo-pectate lyase PL (EC 4.2.2.2). PL was purified to homogeneity in three steps and has a molecular mass of 37.3+/-...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2005.07.019
更新日期:2006-02-10 00:00:00
abstract::Yarrowia lipolytica can accumulate large amounts of storage lipids and has considerable potential for the production of polyunsaturated fatty acids and other lipids for biofuels. When the nitrogen source is exhausted in the medium, the key intermediate, citrate, is converted to acetyl-CoA by ATP:citrate lyase (ACL) fo...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2014.10.004
更新日期:2014-12-20 00:00:00
abstract::The use of a proper signal sequence is one of the major determinants for the efficient secretion of heterologous proteins from yeast. The signal sequence derived from inulinase (INU1A) of Kluyveromyces marxianus was evaluated in directing the secretion of a human glycoprotein, alpha 1-antitrypsin (alpha 1-AT), from Sa...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/0168-1656(96)01391-0
更新日期:1996-07-18 00:00:00
abstract::Glutamate dehydrogenase is a central enzyme connecting nitrogen and carbon metabolism via its precursors ammonium and oxoglutarate and its product glutamate. In Corynebacterium glutamicum glutamate dehydrogenase is especially important, since it is a key enzyme for the biotechnological production of the flavour enhanc...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2009.04.007
更新日期:2009-06-15 00:00:00
abstract::Actinoplanes sp. SE50/110 is the natural producer of acarbose, which is used in the treatment of diabetes mellitus type II. However, until now the transcriptional organization and regulation of the acarbose biosynthesis are only understood rudimentarily. The genome sequence of Actinoplanes sp. SE50/110 was known befor...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2017.04.013
更新日期:2017-06-10 00:00:00
abstract::This study aimed to produce a cellulase blend and to evaluate its application in a simultaneous saccharification and fermentation (SSF) process for second generation ethanol production from sugar cane bagasse. The sugar cane bagasse was subjected to pretreatments (diluted acid and alkaline), as for disorganizing the l...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2012.10.014
更新日期:2013-01-10 00:00:00
abstract::The Bacillus subtilis endoxylanase XynA (BSXY) is frequently used to improve the functionality of arabinoxylan-containing material in cereal based industries. The presence of endogenous Triticum aestivum xylanase inhibitors (TAXI-I and TAXI-II) in wheat is a real concern as they have a direct negative impact on the ef...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2007.02.011
更新日期:2007-05-31 00:00:00
abstract::Porcine circovirus type 2 (PCV2) is the primary causative agent of an economically important swine disease, now known as porcine-associated disease (PCVAD). The only structural protein of viral capsid, Cap has become the major target for development of PCV2 subunit vaccines. The purpose of this study is to express Cap...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2014.04.006
更新日期:2014-07-10 00:00:00
abstract::The thermostable glucose dehydrogenase (GDH) from Burkholderia cepacia sp. SM4 is composed of a catalytic subunit (alpha), an electron transfer subunit (beta), and a small gamma subunit of unknown function. We cloned a 1428-nucleotide gene encoding the beta subunit located immediately downstream of the alpha subunit. ...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2005.10.017
更新日期:2006-05-17 00:00:00
abstract::Biomass-derived d-xylose represents an economically interesting substrate for the sustainable microbial production of value-added compounds. The industrially important platform organism Corynebacterium glutamicum has already been engineered to grow on this pentose as sole carbon and energy source. However, all current...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2014.09.026
更新日期:2014-12-20 00:00:00
abstract::The successful transfer of human embryonic stem cell (hESC) technology and cellular products into clinical and industrial applications needs to address issues of automation, standardization and the generation of relevant cell numbers of high quality. In this study, we combined microcarrier technology and controlled st...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2010.06.015
更新日期:2010-08-02 00:00:00
abstract::The neotype strain Methanobacterium formicicum MF(T) (DSM1535), a hydrogenotrophic methanogenic Archaeon, was isolated from a domestic sewage sludge digestor in Urbana (IL, USA). Here, the complete genome sequence of the methanogen is reported. The genome is 2,478,074bp in size, featuring a GC content of 41.23%. M. fo...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2014.09.018
更新日期:2014-12-20 00:00:00
abstract::The kinetics of microbial growth and the biodegradation of methanol and toluene in (a) biofilters (BFs), and (b) biotrickling filters (BTFs), packed with inert materials, has been studied and analyzed. The specific growth rate, mu, for the treatment of methanol was 0.037h(-1) for a wide range of operating conditions. ...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2008.08.001
更新日期:2008-11-25 00:00:00
abstract::The enzymatic Pictet-Spengler (PS) reaction, catalyzed by Pictet-Spenglerase (PSase), is the feature of β-carboline (βC) alkaloid biosynthesis. NscbB is a rare microbial PSase discovered from a cryptic β-carboline alkaloid biosynthetic gene cluster (BGC) in the Nocardiopsis synnemataformans DSM 44143 (kidney transplan...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2018.07.007
更新日期:2018-09-10 00:00:00
abstract::The growth, the alkaloid production, as well as the scopolamine/hyoscyamine ratio of two clones of belladonna hairy roots were studied. The effects of nitrate and ammonium concentrations on these cultures were investigated. A rise in ammonium concentration caused the decline of the hairy roots, while nitrate had a mar...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/s0168-1656(00)00372-2
更新日期:2001-01-23 00:00:00
abstract::Aiming at maximizing the production of transmembrane rabies virus glycoprotein (rRVGP), the influence of hypothermic temperature on a recombinant Drosophila melanogaster S2 cell culture in Sf-900II medium was investigated. Cell growth and rRVGP production were assessed at 4 culture temperatures in Schott flasks: 16, 2...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2012.05.016
更新日期:2012-10-31 00:00:00
abstract::Consumers prefer biotechnological food products with high nutritional values and good flavors. Solid-state fermentation is a commonly used technique with a long history. In the present study, Myroides sp. ZB35 was used in solid-state fermentative production of aroma volatiles on a rice medium. Using the headspace soli...
journal_title:Journal of biotechnology
pub_type: 杂志文章
doi:10.1016/j.jbiotec.2017.02.003
更新日期:2017-03-10 00:00:00