JOURNAL OF APPLIED POLYMER SCIENCE
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2023
·Vol. 140
·期 27
·e54009
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IF 3
Zhiqiang Song,Fei Xu,Heng Wang,Zhencai Zhang,Mi Feng,Yiwen Zhang,Zhao Yang,Jingxue Xie,Dan Su,Tao Li
Poly(isosorbide carbonate) (PIC) is an example of the shift from fossil to bio-based feedstocks in polymeric materials. However, the naturally high hygroscopicity of isosorbide may lead to the bad dimensional stability of its polymers, limiting its application. This work aims to develop a series of isosorbide-based copolycarbonates by introducing hydrophobic groups, such as alkane chains and aromatic rings, into the polymer backbone via one-pot melt polycondensation. As expected, the molecular structure and steric hindrance of the comonomer have a remarkable effect on the water absorption of the copolycarbonates. Among the comonomers, tricyclo[5.2.1.0(2,6)]decanedimethanol with an alkane skeleton bridge effectively reduces the saturation water absorption by 61% compared to PIC. The water absorption mechanism and kinetics of the copolycarbonates are investigated. Moreover, the incorporation of comonomers in PIC not only exhibits stronger hydrophobicity, but also significantly improves its optical properties. Copolycarbonates obtained have a light transmittance of 92% and a refractive index of 1.5394, which are higher than those of PIC, along with better thermal stability, flexibility, and lower glass transition temperature. This work provides a new strategy for the design of isosorbide-based polycarbonates for use in optics.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Yingqiao Zhou,Yining Liang,Xiaoning Liu,Xinhua Qi
As one of the important value-added chemicals that has wide applications, the catalytic hydrogenation of glucose to sorbitol has been a hot topic in biomass upgrading. In order to support the prosperity of the sorbitol industry, catalysts with superior activity, higher selectivity, longer life, and lower cost are desirable. Herein, tremelliform graphene-like carbon-encapsulated Ru catalysts (Ru/GLC) were synthesized from 4-nitrocatechol by using solvent evaporation-induced self-assembly and KHCO3 chemical activation processes. The Ru/GLC materials were used for the catalytic hydrogenation of glucose to sorbitol, and the best Ru/GLC-600 sample prepared at a 600 °C activation temperature exhibited both high glucose conversion of 100% and sorbitol yield of 96.8% at 140 °C and 3 MPa H2 in 120 min. The Ru/GLC-600 catalyst exhibited excellent stability and durability that sorbitol yield could be remained at 95.4% after recycling five runs. The catalyst was applicable to concentrated glucose solutions (50 wt %) with 95.6% sorbitol yield. Compared with previously reported catalysts, Ru/GLC catalyst had lower apparent activation energy (Ea = 30.66 kJ/mol) and higher turnover frequency (TOF = 1680.6 h–1). This work provides a simple one-pot synthesis strategy for graphene-like carbon materials for metal encapsulating, and the prepared materials exhibited high catalytic activity and stability for glucose hydrogenation to sorbitol.
研究领域:
化学工程
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催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED MICROBIOLOGY
·
2021
·Vol. 130
·期 5
·1456-1465
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IF 3.772
Zhao J.,Tao X.,Wang S.,Li J.,Shao T.
AimsThis study aimed to evaluate the feasibility of sorbic acid (SA) as a silage additive and its effects on fermentation quality and aerobic stability of high dry matter (DM) silage.Methods and ResultsHigh DM rice straw was ensiled with distilled water (C), 1 × 106 CFU per gram fresh weight (FW) Lactobacillus plantarum and 1 × 106 CFU per gram FW Lactobacillus buchneri (LP+LB) or SA for 45 days with a subsequent aerobic stability test. After ensiling, LP+LB silage had the highest lactic acid (LA) content and the lowest pH value, whereas SA silage had the highest DM and water‐soluble carbohydrate (WSC) contents, and the lowest ethanol and ammonia nitrogen (NH3‐N) contents among all silages (P < 0·001). Compared to C silage, SA significantly (P < 0·01) reduced the counts of yeasts but not lactic acid bacteria (LAB). During 6‐day aerobic exposure, the continuous pH increase and LA decrease were observed in C and LP+LB silages, and there was no significant change in pH, DM, NH3‐N and WSC contents of SA silage over the whole aerobic exposure. The SA addition slowed the decline of LA and acetic acid (AA) contents as well as the growth of yeasts and aerobic bacteria under aerobic exposure.ConclusionIn this study, L. buchneri could not function in high DM rice straw silage while SA effectively improved both the fermentation quality and aerobic stability.Significance and Impact of the StudyThe SA was more effective than dual‐purpose inoculants to improve the aerobic stability of high DM rice straw silage. Thus, SA can be served as a potential antifungal additive for silage with high DM.
研究领域:
动物科学
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微生物学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Chenli Wu,Shihao Su,Lei Wang
C-lignin is a linear aromatic biopolymer with a uniform structure and acid resistance formed by catechol monomers linked through unique benzodioxane bonds. Compared to the heterogeneous guaiacyl (G)/syringyl (S)-lignin, the homogeneous nature of C-lignin enables its efficient depolymerization into a single catechol product, making it more suitable for downstream processing. This study investigated effects of various Brønsted acids and Lewis acids in a dimethyl isosorbide (DMI) /H 2 O co-solvent system on the C-lignin extraction from castor shells. Results show H 2 SO 4 assisted DMI/H 2 O co-solvent enables the most efficient disassembly of C-lignin containing sample with a yield of 95 mg/g castor shells. Quantitative 13 C NMR analysis indicates that the molar concentration of caffeyl alcohol units in the lignin is 2.06 μmol/mg, corresponding to 34.2 % C-lignin by weight at 120 °C within 2 h. The obtained C-lignin can be selectively converted to catechol derivatives (yield: 89 mol%) via Pd/C catalysis. This study demonstrates efficient pretreatment and utilization of C-lignin, offering a promising potential approach for its industrial uses.
研究领域:
生物化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Bo Wang,Wen Cai,Huai Liu,Rui Zhang,Wenlong Jia,Junhua Zhang,Lincai Peng
Catalytic hydrogenation of carbohydrates over the Raney Ni catalyst is an important industrial process to produce valuable polyols. However, this process generally encounters challenges such as harsh reaction conditions, low catalytic activity, and catalyst deactivation. In this contribution, metallic nickel-rich nickel borides (NiBO-nKH2PO4) were successfully constructed via a simple chemical reduction method with potassium dihydrogen phosphate (KH2PO4) as the buffering agent and sodium borohydride (NaBH4) as the reducing reagent. Especially, the obtained NiBO-10KH2PO4 afforded quantitative sorbitol yield from the catalytic hydrogenation of glucose under mild reaction conditions within 1 h (80 °C and 1 MPa H2). Compared with the reported literature for the production of sorbitol from glucose, the developed NiBO-10KH2PO4 catalyst circumvents the use of a high hydrogen pressure and reaction temperature while delivering excellent catalytic performance and stability. Moreover, the experimental analysis demonstrated that the obtained nickel borides, with the assistance of KH2PO4, possessed abundant metallic nickel species, which favored the adsorption and activation of hydrogen molecules and thus largely promoted the hydrogenation of glucose. This work provides new insights into the rational design of practical nickel-based catalysts for the efficient catalytic hydrogenation of carbohydrates.
研究领域:
化学工程
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催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
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2024
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IF 7.4
Baolin Xia,Ruohan Shi,Wei Wang,Weijun Peng,Yijun Cao,Yukun Huang,Guixia Fan
A substantial stockpile of phosphogypsum (PG) not just consumes land resources, but also poses environmental contamination risks. Herein, the conversion of PG into high-value α-hemihydrate gypsum (α-HH) whisker by the atmospheric pressure salt solution method with simple process, high efficiency and low energy consumption was investigated. Sodium nitrate was found to accelerate the conversion of PG into α-HH, and sorbitol could modify the α-HH into rod-like morphology with high aspect ratios . The α-HH whiskers with an average length of 96.28 µm and an average aspect ratio of 25.47 were prepared within 1.5 h under the optimal parameters of 80 ℃, sodium nitrate-30 wt%, PG-12 wt%, and sorbitol-1 wt%. The modulation mechanism was that hydroxyl groups in sorbitol formed strong hydrogen bonds with the sulfate groups on the lateral of the crystals, which promoted the growth of α-HH along the c-axis. Moreover, the filtrate could be effectively recycled by adding salt medium and crystallization modifier. Such technique provides a theoretical basis for the high-value utilization of PG.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Biao Yang,Xinyu Wan
Nucleating agents, especially those with small particle sizes, are preferred to boost the nucleation density and crystallinity of poly(lactic acid) (PLA) due to its weak crystallization capability. Organophilicly modified nanofillers hardly alter the nucleation and crystallinity of non-isothermally crystallized PLA. Herein, nano-silica adsorbed trace D -sorbitol (m-SiO 2 ) as a heterogeneous nucleating agent was melt-mixed with poly( L -lactic acid) (PLLA), and the isothermal and non-isothermal crystallization behavior, as well as crystallization kinetics, were investigated. Transmission electron microscopy (TEM) revealed that m-SiO 2 was uniformly dispersed in the PLA matrix as 100–300 nm clusters. Differential scanning calorimetry (DSC) and polarized optical microscopy (POM) showed that the nucleation rate and density of the non-isothermally crystallized PLLA/m-SiO 2 composites were significantly improved. Despite the fact that m-SiO 2 does not raise the overall non-isothermal crystallization rate, the crystallization temperature and crystallinity of the PLLA/3%m-SiO 2 composite increased from 97.2 °C and 6.8 % for neat PLLA to 108.2 °C and 48.6 % (10 °C/min cooling rate), respectively. The Avrami exponent n of isothermal crystallization remains unchanged, while the crystallization rate increases dramatically. Both isothermal and non-isothermal crystallization have increased activation energies. The heat deflection temperature increased from 59 °C of neat PLLA to 152 °C with a 50 % increase in impact strength.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
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2024
·
IF 4.4
Hang Shen,Xiaojie Chen,Botuo Zheng,Huagui Zhang
Biopolymers as abundant, sustainable, and environment-friendly renewable material have been regarded as the best alternative to nondegradable fossil products. However, these biopolymers are often confronted with problems such as high prices, poor mechanical properties, and susceptibility to bacterial erosion. In the current study, inverse vulcanization was adopted to synthesize polymers with multisulfur segments cross-linked by plant-based sorbic acid and non-edible tung oil. The synthesized copolymer exhibited tailorable glass transition temperatures (0.3–24.8 °C) and rheological behaviors with modulus alterable within an order of magnitude. The addition of transesterification catalyst Zn(acac)2 lowered the activation energy of stress relaxation by ∼20 kJ/mol. Thanks to the dynamic reversible S–S bonds, this networked polymer also exhibited regulatable thermal self-healing behaviors. Moreover, in the blending with polylactide (PLA), the reversible dissociation of S–S bonds at high temperature facilitates the dispersion of polysulfides in the PLA matrix, which can be further improved by adding catalyst, adjusting monomer ratios, etc. As a result, the polysulfides not only toughen the PLA but also endow the blends with excellent antibacterial activities attributed to the intrinsic bacteriostatic sorbic acid and sulfur. Used as a modifer for bioplastics to adjust their mechanical properties and functions, polysulfides are expected to have potential applications in medical materials or food packaging fields.
研究领域:
材料科学
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生物医学工程
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2024
·
IF 3.9
Limin Ren,Yuxuan Xiao,Rameswar Bhattacharjee,Jingjing Wu,Pengyi Tang,Stavros Caratzoulas,Changgong Meng,Qiang Guo,Michael Tsapatsis
Graphical Bifunctional Ti-B-Beta zeolite is demonstrated to be an efficient catalyst for sorbose production via glucose isomerization. Ethanol directs the conformation of glucose, facilitating its selective isomerization to sorbose and enables this isomerization to surpass the thermodynamic equilibrium limit by engaging in reactions with the resultant sorbose. D-Glucose-to-L-sorbose isomerization on Lewis acidic zeolite is a highly attractive avenue for sorbose production. But the L-sorbose yield is limited by the competing D-glucose-to-D-fructose isomerization and reaction equilibrium. In this work, it is suggested that ethanol directs the glucose conformation for selective D-glucose-to-L-sorbose isomerization. It also reacts with the produced L-sorbose to form ethyl-sorboside, which allows the D-glucose-to-L-sorbose isomerization to proceed beyond the thermodynamic equilibrium limit. It is shown that a bifunctional zeolite Beta containing framework titanium (Ti) and boron (B) is a selective catalyst for this tandem reaction: Lewis acidic framework Ti catalyzes the D-glucose-to-L-sorbose isomerization via an intramolecular 5,1-hydride shift process as confirmed by isotopic tracing experiments followed by 13 C-NMR, while weak Brønsted acid framework B selectively promotes the sorbose ketalization with ethanol. A remarkably high yield of L-sorbose with a high fraction of sugar (>95 %: 27 % unreacted glucose, 11.4 % fructose, 57 % sorbose) was obtained after the mixture produced in ethanol was hydrolyzed.
研究领域:
化学工程
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催化科学
✓ 已验证
DOI
高影响因子
MACROMOLECULES
·
2022
·
IF 6.057
Yujian Liu,Yongyao Lei,Yougen Chen
The current contribution presents the synthesis of poly[oligo(ethylene glycol) sorbate]s (PREGmSs) by the t-Bu-P4-catalyzed group transfer polymerization (GTP) method, their postpolymerization modification at the backbone double bond, and thermoresponsive properties in aqueous solution. Four oligo(ethylene glycol) sorbate monomers (REGmSs), including 2-(2-methoxyethoxy)ethyl sorbate (MeEG2S), 2-(2-(2-methoxyethoxy)ethoxy)ethyl sorbate (MeEG3S), 2-(2-(2-ethoxyethoxy)ethoxy)ethyl sorbate (EtEG3S), and 2-(2-(2-(2-methoxyethoxy)ethoxy)ethoxy)ethyl sorbate (MeEG4S), are newly designed to study the thermoresponsive properties of their related polymers. The t-Bu-P4-catalyzed GTP of REGmS only proceeds in a 1,4-regioselective addition manner to quantitatively produce the backbone trans-rich (ca. 80%) PREGmS. The complete hydrogenation and epoxidation of the backbone double bonds result in hydrogenated and epoxidized polymers (PREGmS-H2 and PREGmS-epoxy, respectively), which have different main-chain structures and rigidity from their parent PREGmS. Given the 1,4-substituted structure of a sorbate monomer, the chemical structure determination of PREGmS-H2 by 13C NMR spectra demonstrates that the above polymers have an erythro-rich (ca. 60%) structure in diastereochemistry and a diisotactic/disyndiotactic ratio around 1:1 in stereoregularity. The thermoresponsive properties of PREGmS, PREGmS-H2, and PREGmS-epoxy in aqueous solutions are studied in detail from various aspects in terms of polymer mass concentration, molecular weight, length and end group of the oligo(ethylene glycol) side chain, and main-chain structure by turbidity, 1H NMR spectroscopy, and dynamic light scattering (DLS) methods, which are discussed below.
研究领域:
高分子化学
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材料科学
✓ 已验证
DOI
高影响因子
FOOD CONTROL
·
2016
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IF 3.388
Changbao Wang,Jie Yang,Xiaoyu Zhu,Yingjian Lu,Yingying Xue,Zhaoxin Lu
Salmonella is an important foodborne pathogen and a serious threat to human health worldwide. This study was to reduce Salmonella and the spoilage bacteria on fresh chilled pork using bacteriophage, nisin, and potassium sorbate (PS) along with their combinations. Microbial, chemical, and sensory qualities of the fresh chilled pork (artificially contaminated with Salmonella 3 log CFU/g) treated with bacteriophage (9 log PFU/g), nisin (5000 IU/g), PS (2 mg/g) and their combinations were evaluated. The result showed that all the samples treated with phage could significantly ( P < 0.05) reduce Salmonella population on fresh chilled pork. The combination treatment of nisin, PS and phage (N-PS-P) could significantly lower total viable counts (TVC), TVB-N and TBARS of the chilled pork during the storage period. The TVC of sample treated by N-PS-P was reduced by 2.3 log CFU/g at 7th day. It was also found through the electronic nose detection that the N-PS-P treatment was able to significantly reduce odour and maintain good sensory of the chilled pork. Hence, the N-PS-P treatment extended the shelf life of fresh chilled pork up to 14 days. No adverse effect of the phage on the chilled pork was observed. In conclusion, this study suggests that the phage and its combination with nisin and PS have great potential to be used as a good preservative for fresh chilled pork.
研究领域:
食品安全
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微生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2018
·
IF 3.412
Ting-tiao Pan,Da-Wen Sun,Hongbin Pu,Qingyi Wei
A simple method based on surface-enhanced Raman scattering (SERS) was developed for the rapid determination of alternariol (AOH) in pear fruits using an easily prepared silver-nanoparticle (AgNP) substrate. The AgNP substrate was modified by pyridine to circumvent the weak affinity of the AOH molecules to the silver surface and to improve the sensitivity of detection. Quantitative analysis was performed in AOH solutions at concentrations ranging from 3.16 to 316.0 μg/L, and the limit of detection was 1.30 μg/L. The novel method was also applied to the detection of AOH residues in pear fruits purchased from the market and in pear fruits that were artificially inoculated with Alternaria alternata. AOH was not found in any of the fresh fruit, whereas it resided in the rotten and inoculated fruits. Finally, the SERS method was cross validated against HPLC. It was revealed that the SERS method has great potential utility in the rapid detection of AOH in pear fruits and other agricultural products.
研究领域:
食品科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）