Effects of esterification on the structural, physicochemical, and flocculation properties of dextran

Li, Ruo-Han; Zeng, Tao; Wu, Min; Zhang, Hongbin; Hu, Xueqin

doi:10.1016/j.carbpol.2017.07.034

Cited by 32 publications

(9 citation statements)

References 39 publications

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“…It has log P o /w value of −7.6 and LD 50 of 10 700 mg/kg hence could be classified as green. A green chemical is expected to have log P o /w value of less than 3 and LD 50 /LC 50 that falls within category 4 (LD 50 /LC 50 ≥ 2000) or 5 (LD 50 /LC 50 ≥ 5000). − Dextran is available in multiple molecular weights; high branching level in dextran can lower its solubility in aqueous solution . Dextrans have gained application in the food industry, oil drilling, and medical field .…”

Section: Introductionmentioning

confidence: 99%

Exploration of Dextran for Application as Corrosion Inhibitor for Steel in Strong Acid Environment: Effect of Molecular Weight, Modification, and Temperature on Efficiency

Solomon

Umoren

Obot

et al. 2018

ACS Appl. Mater. Interfaces

151

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The possibility of utilizing dextran as a green corrosion inhibitor for steel in strong acid environment was explore using weight loss, electrochemical (electrochemical impedance spectroscopy (EIS), electrochemical frequency modulation (EFM), potentiodynamic polarization (PDP), and linear polarization (LPR)) supported with surface analysis via scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDAX), atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS) techniques. The effect of molecular weight, temperature, and modification on the inhibition efficiency of dextran was also studied. Results from all the applied techniques reveal that dextran exhibit moderate anticorrosion property toward St37-2 steel dissolution in 15% HSO solution. Dextran with molecular weight of 100 000-200 000 g/mol (Dex 1) exhibited the highest inhibition efficiency of 51.38% at 25 °C. Based on PDP results, dextran behaved as a mixed type corrosion inhibitor. Inhibition efficiency of dextran varies inversely with molecular weight but directly with temperature. Two modification approaches, namely incorporation of silver nanoparticles (AgNPs) into dextran matrices and combination with 1 mM KI were adopted to enhance the inhibition efficiency of dextran and the approaches proved effective. The protective capability of Dex 1 has been upgraded from 51.38% to 86.82% by infusion of AgNPs and to 94.21% by combination with KI at 25 °C. Results from the study on the effect of temperature reveals that Dex 1 + KI mixture could synergistically offer 99.4% protection to St37-2 steel in 15% HSO environment at 60 °C. Surface analysis results confirm the presence of additives molecules on the studied metal surface. XPS results disclose that AgNPs are in oxide form while iodide ions are in the form of triiodide and pentaiodide ions on the metal surface. Modified dextran is a promising candidate for application as corrosion inhibitor in acid induced corrosive environment.

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Section: Introductionmentioning

confidence: 99%

Exploration of Dextran for Application as Corrosion Inhibitor for Steel in Strong Acid Environment: Effect of Molecular Weight, Modification, and Temperature on Efficiency

Solomon

Umoren

Obot

et al. 2018

ACS Appl. Mater. Interfaces

151

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show abstract

“…Dextran was used in biodegradable blend membranes of poly(butylene succinate)/cellulose acetate/dextran as an additive to improve hydrophilicity, mechanical strength, biodegradability and antifouling properties of the membranes used in dairy wastewater treatment [ 19 ]. The report demonstrated that contact angle was reduced up to 16% with the increase in the dextran concentration from 0 to 2 wt%, while the amounts of pure water flux and permeate flux of wastewater were improved by 154% and 1543%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of dextran-coated iron oxide nanoparticles

et al. 2018

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Synthesis and characterization of iron oxide nanoparticles coated with a large molar weight dextran for environmental applications are reported. The first experiments involved the synthesis of iron oxide nanoparticles which were coated with dextran at different concentrations. The synthesis was performed by a co-precipitation technique, while the coating of iron oxide nanoparticles was carried out in solution. The obtained nanoparticles were characterized by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction spectrometry, Fourier transform infrared spectroscopy and superconducting quantum interference device magnetometry. The results demonstrated a successful coating of iron oxide nanoparticles with large molar weight dextran, of which agglomeration tendency depended on the amount of dextran in the coating solution. SEM and TEM observations have shown that the iron oxide nanoparticles are of about 7 nm in size.

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“…Additionally, the curve shapes of Gtf‐DSM dextran and GtfO reuteran were highly similar to those of the amorphous L. citreum ABK‐1 alternan composed of 60% (α1→6) and 40% (α1→3) linkages (Wangpaiboon et al ., 2019). Compared to Gtf‐DSM dextran, GtfO reuteran showed an additional small peak at 2 θ = 29°, which was also observed in the L. mesenteroides 0326 dextran containing 95% (α1→6) and 5% (α1→3) linkages (Li, Zeng, Wu, Zhang, & Hu, 2017). However, some other characteristic peaks, including 2 θ = 15°, 18°, and 20°, present in the spectrum of L. mesenteroides 0326 dextran, were not detected in either Gtf‐DSM dextran or GtfO reuteran, which may be ascribed to the difference in linkage composition.…”

Section: Resultsmentioning

confidence: 83%

Comparative study of physicochemical properties of dextran and reuteran synthesised by two glucansucrases that are highly similar in amino acid sequence

Chen

Cheng

et al. 2021

Int J of Food Sci Tech

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Recently, lactic acid bacteria (LAB)-derived a-glucans have drawn strong attention owing to their various structural organisation and wide (potential) applications in the medicine, food, cosmetic, and biotechnology industries. However, the physicochemical properties of diverse a-glucans, particularly reuteran, remain largely unknown, which significantly impedes their wider applications. This study comparatively evaluated the physicochemical properties of two different a-glucans, Gtf-DSM dextran, and GtfO reuteran produced by the dextransucrase Gtf-DSM from Lactobacillus ingluviei DSM 14792 and the reuteransucrase GtfO from Lactobacillus reuteri ATCC 55730, which are two glucansucrases highly similar in amino acid sequence. The surface morphology analysis demonstrated that Gtf-DSM dextran had a holey and fissured microstructure; however, GtfO reuteran had an irregular dendritic microstructure, forming a fibrous network. Compared to GtfO reuteran, Gtf-DSM dextran showed a larger average particle diameter (162.4 versus 90.3 nm). Additionally, Gtf-DSM dextran displayed some prominent properties, such as better thermostability, higher apparent viscosity, and stronger gel-forming capability, than GtfO reuteran. These results provide a theoretical basis for stimulating the applications of LAB-derived a-glucans in various fields.

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Effects of esterification on the structural, physicochemical, and flocculation properties of dextran

Cited by 32 publications

References 39 publications

Exploration of Dextran for Application as Corrosion Inhibitor for Steel in Strong Acid Environment: Effect of Molecular Weight, Modification, and Temperature on Efficiency

Exploration of Dextran for Application as Corrosion Inhibitor for Steel in Strong Acid Environment: Effect of Molecular Weight, Modification, and Temperature on Efficiency

Synthesis and characterization of dextran-coated iron oxide nanoparticles

Comparative study of physicochemical properties of dextran and reuteran synthesised by two glucansucrases that are highly similar in amino acid sequence

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