Abstract:
:The biosynthesis of medium chain length poly(3-hydroxyalkanoates) mcl PHAs by Pseudomonas guezennei using glucose, sodium octanoate, and 10-undecenoic acid as sole or mixed carbon sources was investigated. Chemical composition of polyesters was analyzed by GCMS and NMR. The copolyester produced by P. guezennei from glucose mainly consisted of 3-hydroxyoctanoate and 3-hydroxydecanoate, and the presence of 3-hydroxydodec-5-enoate was demonstrated. Using sodium octanoate as the sole nutrient, the microorganism produced a poly(3-hydroxyoctanoate) (PHO) polymer containing up to 94 mol% 3-hydroxyoctanoate. Biosynthesis of poly[(3-hydroxyoctanoate)-co-(3-hydroxyundecenoate)] (PHOU) copolymers bearing terminal reactive double bonds on its side chains with unsaturation degree ranging from 8.8% to 78.2% was obtained by tuning the ratio of sodium octanoate/10-undecenoic acid in the medium. Thermal analysis indicated semi-crystalline polymers with melting temperatures (T(m)) ranging from 46 to 55°C, fusion enthalpy (ΔH) comprised between 3 and 35 J/g and glass transition temperature (T(g)) from -36 to -44°C, except for the highly amorphous 78.2% unsaturated PHOU with a low T(g) (-50°C). Molecular weights determined by GPC ranged from 119000 and 530000 g/mol. The biosynthesis of natural polyesters with controlled ratio of vinyl-terminated side chains is of great interest for further chemical modifications.
journal_name
Int J Biol Macromoljournal_title
International journal of biological macromoleculesauthors
Simon-Colin C,Gouin C,Lemechko P,Schmitt S,Senant A,Kervarec N,Guezennec Jdoi
10.1016/j.ijbiomac.2012.08.018subject
Has Abstractpub_date
2012-12-01 00:00:00pages
1063-9issue
5eissn
0141-8130issn
1879-0003pii
S0141-8130(12)00334-0journal_volume
51pub_type
杂志文章abstract::To fabricate a biomimetic nanostructured bicomponent scaffolds, two types of chitin/silk fibroin (SF) nanofibrous scaffolds (blend scaffolds and hybrid scaffolds) were prepared by electrospinning or simultaneous electrospinning of chitin/SF solutions. The chitin/SF bicomponent scaffolds were after-treated with water v...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2007.12.004
更新日期:2008-05-01 00:00:00
abstract::An arabinogalactan (ICPA) was isolated from the water extract of Ixeris chinensis (Thunb.) Nakai. ICPA was mainly composed of galactose and arabinose with minor amount of glucose. The molecular weight of ICPA was 58.1 kDa. Structural analysis by methylation and NMR spectroscopy indicated that ICPA contained α-D-Glcp(1...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2019.09.158
更新日期:2020-01-15 00:00:00
abstract::Curdlan is a polysaccharide that consists of β-1,3-linked glucose residues. A polysaccharide-producing bacterium isolated from soil samples was identified as Pseudomonas sp. QL212. The polysaccharide was purified to homogeneity via sequential ethanol precipitation, deproteinization, CM ion-exchange, and gel chromatogr...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2016.04.027
更新日期:2016-08-01 00:00:00
abstract::Black soybeans are commonly consumed as health foods and used in traditional Chinese medicine, but they are rarely cultivated as edible sprouts. During germination, the composition of seeds undergoes distinct changes that cause variations in bioactivities. In this study, the water-soluble black soybean polysaccharide ...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2018.02.145
更新日期:2018-07-01 00:00:00
abstract::This paper concerns the characterization of the chemical structure of a DP3 glucosamine oligomer. The assignments of nearly all protons are reported. Variations of 1H chemical shifts with pD and temperature are correlated to the pKa of amino groups, and not with substantial conformational changes. ...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/0141-8130(91)90057-2
更新日期:1991-04-01 00:00:00
abstract::EPPS, a new heteropolysaccharide from Echinops pungens roots, was extracted by warm water (70 °C) and fortuitously purified using column chromatographies on DEAE-cellulose A52 and Sephadex G-100. Total carbohydrate content, specific optical rotation and molecular mass of EPPS were 98.3%, -88.2 and 65.7 kDa, respective...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2020.06.128
更新日期:2020-10-15 00:00:00
abstract::Electrospinning technique was used to fabricate chloroamphenicol loaded poly (L-lactic acid)/ZrO2 (CP-PLLA/ZrO2) nanofibrous membranes. The average diameter of drug carrier PLLA/ZrO2 nanofibers increased with ZrO2 concentration increasing and ribbon-shape fibers were present when ZrO2 content reached 3% and above. The...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2013.10.002
更新日期:2013-11-01 00:00:00
abstract::Superhydrophobic cotton fabrics were fabricated using chitosan/titanium dioxide (TiO2) nanocomposites. Morphology results revealed that the fabric's surface was utterly coated by the nanoparticles leading to the formation of a highly packed nano-scale structure in the case of superhydrophobic coating. X-ray photoelect...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2020.12.220
更新日期:2021-01-06 00:00:00
abstract::Injectable thermo-responsive hydrogels have been studied for various biomedical applications including; drug delivery, cell encapsulation, and tissue repairing. There are various natural and synthetic polymers which exhibit homogenous injectable solution at ambient temperature and form a gel in human body temperature....
journal_title:International journal of biological macromolecules
pub_type: 杂志文章,评审
doi:10.1016/j.ijbiomac.2019.04.131
更新日期:2019-07-15 00:00:00
abstract::Modafinil is an approved drug for the treatment of narcolepsy and have a strong market presence in many countries. The drug is widely consumed for off-label uses and currently listed as a restricted drug. Modafinil has very low water solubility. To enhance the aqueous solubility of modafinil by the formation of a tern...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2015.11.075
更新日期:2016-03-01 00:00:00
abstract::Indole-3-acetic acid (IAA)/diol based pH-sensitive biopolymeric hydrogels with tunable biological properties (cytotoxicity, anti-oxidant and anti-fungal) have been synthesized via condensation polymerization. The present study focused on the synthesis of heterocyclic hydrogel using citric acid (CA), indole-3-acetic ac...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2016.11.068
更新日期:2017-02-01 00:00:00
abstract::Salt hydrate phase change materials (PCMs) possess the challenge of supercooling, which must be addressed to allow more efficient energy storage and utilisation. In this work, cellulose nanofibril (CNF), a versatile biopolymer was used to support and disperse silver nanoparticles (AgNPs), and the synthesised CNF/AgNPs...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2021.01.183
更新日期:2021-01-30 00:00:00
abstract::Timely antibacterial treatment of wounds reduces the probability of wound infection and promotes wound healing. However, the materials used to treat wounds often fail to provide both sterilization (especially for super bacteria) and moisture, and some may even cause secondary injury to the wound. In this study, gold n...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2020.01.190
更新日期:2020-04-01 00:00:00
abstract::In this research casting method was used to prepare potato starch based bio-nanocomposite films with halloysite nanoclay as the reinforcing materials. The composition included potato starch with 40% (w/w) of a mixture of sorbitol/glycerol (weight ratio of 3 to 1as plasticizer) with nanoclay (0-5% w/w). The films were ...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2014.04.009
更新日期:2014-06-01 00:00:00
abstract::Boron is reported in this study to stabilize the structure of heme proteins exposed to peroxides. The oxidized heme protein (15 microM) was treated with H(2)O(2) (10mM) in 1M glycine-NaOH buffer (pH 9.2) at 25 degrees C in absence/presence of boron, and characterized by visible absorption spectroscopy, gel exclusion c...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2010.05.013
更新日期:2010-08-01 00:00:00
abstract::A new series of substituted tacrine/acridine and tacrine/tacrine dimers with aliphatic or alkylene-thiourea linkers was synthesized and the potential of these compounds as novel human acetylcholinesterase (hAChE) and human butyrylcholinesterase (hBChE) inhibitors with nanomolar inhibition activity was evaluated. The m...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2014.06.064
更新日期:2014-09-01 00:00:00
abstract::Brasenia schreberi (B. schreberi) is a rare and precious vegetable, which coat with a gelatinous mucilage. This study is aiming to investigate the relationship between structural characteristics and hypoglycemic activities of polysaccharides with different molecular weight (Mw) range. Three polysaccharides fractions, ...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2019.05.129
更新日期:2019-08-15 00:00:00
abstract::The chitosan chains were integrated with MCM-48 mesoporous silica in an eco-friendly composite (CH/MCM-48) of enhanced adsorption capacity. The prepared CH/MCM-48 composite was applied in systematic retention of U (VI) as well as Sr (II) ions from water as the commonly detected radioactive pollutants. It displayed pro...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2021.01.136
更新日期:2021-01-23 00:00:00
abstract::In this study, medical cotton was subjected to acid hydrolysis in sulfuric, hydrochloric and phosphoric acid medium to prepare cellulose nanocrystals (CNC) with different morphologies and polymorphism. Morphology of the prepared CNC samples revealed fiber shaped morphology for sulfuric and hydrochloric acid hydrolyzed...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2019.03.027
更新日期:2019-06-01 00:00:00
abstract::Lamellar single crystals of amylose V glycerol were grown at 100 degrees C by evaporating water from solutions of amylose in aqueous glycerol. The crystals which were square, with lateral dimensions of several micrometers, gave sharp electron diffraction patterns presenting an orthorhombic symmetry with a probable spa...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/0141-8130(95)01069-6
更新日期:1996-02-01 00:00:00
abstract::An enzyme-free dual catalytic DNA circuit for amplified detection of nucleic acids has been developed. The system functions based on a cyclic self-assembly of two auxiliary hairpins (H1 and H2) and three biotinylated hairpin oligonucleotides (H3, H4 and H5), in the format of two molecular circuits. In the upstream cir...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2020.03.059
更新日期:2020-07-01 00:00:00
abstract::A water-soluble polysaccharide was isolated from Crassostrea gigas (CGPS-1) by hot-water extraction, isoelectric precipitation, hydrolysis and ultrafiltration without using ethanol. Based on the calibration with Dextran, CGPS-1 had a molecular weight of approximately 6.5×10(6) Da. CGPS-1 was analyzed using high-perfor...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2015.03.056
更新日期:2015-01-01 00:00:00
abstract::In this work, various new nano-alkalinecellulose carboxylates (NACCs) were prepared by oxidative hydrolysis of microalkalinecellulose (MACp) given from prewashed cotton. After the optimization of the reaction time, temperature, oxidant system, and oxidant loading, the new flake-shape anionic NACC24 with base capacity ...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2019.05.024
更新日期:2019-08-01 00:00:00
abstract::Sulfated polysaccharides were shown to benefit metabolic syndrome (MS) and gut microbiota, but the contribution of sulfate group remains unclear. In this study, sulfated polysaccharides from pacific abalone (AGSP) and its desulfated product (D-AGSP) were prepared, and the contribution of sulfate group was analyzed via...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2020.08.010
更新日期:2020-12-01 00:00:00
abstract::An agar-degrading bacterium, strain BN3, was isolated from a coastal soil sample collected in Taiwan Strait, China and identified to be a novel species of the genus Microbulbifer. The gene (N3-1) encoding for a novel β-agarase from the isolate was cloned and sequenced. It encoded a mature protein with 274 amino acids ...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2018.08.053
更新日期:2018-11-01 00:00:00
abstract::Seeds from avocado (Persea americana Miller) fruit are a waste byproduct of fruit processing. Starch from avocado seed is a potential alternative starch source. Two different extraction solvents were used to isolate starch from avocado seeds, functional and rheological characteristics measured for these starches, and ...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2016.01.052
更新日期:2016-05-01 00:00:00
abstract::This study is the first to evaluate the effects of Iron oxides (FeOx) species and their decoration on graphene oxide/chitosan (GO/CS) composites for Cr(VI) removal and the possibility of Fe secondary pollution. Results show that Fe(III) is a better decoration material than Fe(II) and decoration through immersion-evapo...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2021.01.060
更新日期:2021-01-13 00:00:00
abstract::Limonium sinense (Girard) Kuntze is a traditional Chinese folk medicine used for the treatment of fever, hemorrhage, hepatitis and other disorders. The study focused on the antitumor and immunomodulatory activities of L. sinense polysaccharides (LSP) which was obtained from the root of the plant. The antitumor effects...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2012.08.037
更新日期:2012-12-01 00:00:00
abstract::Microcrystalline cellulose and Bombyx mori silk blended biocomposite films were regenerated using various imidazolium-based ionic liquids. The films were characterized to understand the effect of the inter- and intra-molecular interactions upon the morphology and thermal properties. Various techniques were implemented...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2017.11.137
更新日期:2018-03-01 00:00:00
abstract::In the present study the effect of iodine on the structural characteristics (by infrared spectroscopy and X-ray) of films made from kidney bean starch was evaluated. The pasting properties as affected by iodine and glycerol were also evaluated. Kidney bean starch showed C-type (mixture of A- and B-type) crystalline st...
journal_title:International journal of biological macromolecules
pub_type: 杂志文章
doi:10.1016/j.ijbiomac.2009.04.006
更新日期:2009-08-01 00:00:00