JOURNAL OF FOOD COMPOSITION AND ANALYSIS
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2025
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IF 4.6
Yongyao Lu,Yanlin Hou,Shutian Liu,Shugang Jia,Yanmei Zhu,Xuehong Zhang
The composition and content of γ-oryzanol significantly influenced its biological activity. The contents of γ-oryzanol in 19 Chinese brown rice ( Oryza sativa L.) cultivars were quantified and characterized using high-performance liquid chromatography/mass spectrometry . The total content of γ-oryzanol in these 19 Chinese brown rice cultivars ranged from 19.37 to 232.2 mg/100 g, with an average of 76.23 mg/100 g. Five specific steryl ferulates were identified. Cycloartenyl ferulate, 24-methylene cycloartanyl ferulate, and β-sitosteryl ferulate comprised approximately 82 % of the total γ-oryzanol content, while campesteryl ferulate and stigmastanyl ferulate constituted the remaining 18 %. Japonica and glutinous rice exhibited similar γ - oryzanol contents, which were significantly different from those of indica rice. No significant difference was observed in the total γ-oryzanol content between the short-grain and long-grain rice. However, there were significant differences in the steryl ferulates. Both latitude and longitude significantly influenced the γ-oryzanol content, and longitude had a more pronounced effect than latitude. Apart from the lack of correlation between cycloartenyl ferulate and β-sitosteryl ferulate, significant correlations were observed among the contents of the other steryl ferulates. This study offers valuable insights to scientifically assess the nutritional value of Chinese brown rice, guide the breeding of varieties and inform high-quality cultivation practices.
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CHEMICAL ENGINEERING SCIENCE
·
2024
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IF 4.1
Ying Gao,Yong Liu,Lingling Gao,Jinxing Long
An effective strategy is proposed here for transfer hydrogenation of alkyl levulinate to γ-valerolactone (GVL) using a UiO-66 framework modified with phosphotungstate ionic liquid (UiO-66@IL(HPW)). Due to the intensive influence of ionic liquid fragment, the modification significantly enhances the catalytic activity of UiO-66@IL(HPW), leading to a complete conversion of ethyl levulinate with over 93.1% selectivity for GVL. Characterizations techniques, including XRD, N 2 absorption/desorption, SEM, FT-IR, pyridine FT-IR, NH 3 -TPD and CO 2 -TPD, confirm that while the basic structure of UiO-66-NH 2 is insignificantly changed, the introduction of the ionic liquid greatly improves the acidic/base properties of the catalyst. XAFS and XPS results reveal an intensive interaction between the N and W species in UiO-66@IL(HPW), and the formed W-N/O moiety is responsible for the enhanced catalytic activity. In addition, a plausible catalytic mechanism is proposed based upon in situ DRIFTS and density functional theory (DFT) calculations, highlighting the crucial role of ionic liquid fraction within the UiO-66 ligand. Therefore, this work would contribute to the valorization of biochemicals.
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Journal of Materials Chemistry B
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2017
·Vol. 5
·期 28
·5668-5678
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IF 4.543
Wei Chen,Rui Wang,Tingting Xu,Xuebin Ma,Zhong Yao,Bo Chi,Hong Xu
Injectable hydrogels are promising candidates for adhesives because of their ease of administration, minimal invasion, and biocompatibility. While developing surgical adhesives with strong wet tissue adhesion, controlled degradability and mechanical properties, and excellent biocompatibility have still been a significant challenge. Herein, inspired from nature, we report a novel mussel-inspired tissue-adhesive hydrogel composed of poly(γ-glutamic acid) and dopamine (γ-PGA–DA) that can bond tissues well and stop bleeding in a wet environment by improving its tissue adhesiveness via a horseradish peroxidase-mediated reaction. The hydrogel exhibited 10–12 fold stronger wet tissue adhesion strength (58.2 kPa) over the clinically used fibrin glue and more effective hemostatic ability following liver impalement in animal models (41.2% reduction in the average amount of bleeding compared with fibrin glue). In addition, the hydrogels demonstrated controlled gelation time, swelling ratio, microscopic morphology, biodegradability and tissue-like elastomeric mechanical properties, and exhibited excellent cyto/tissue-compatibility. The overall results suggest that the γ-PGA–DA hydrogels can be considerably applied as promising wet-resistant adhesives and hemostatic materials.
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BIOSENSORS & BIOELECTRONICS
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2016
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IF 7.476
Xianfeng Hou,Fang Zeng,Shuizhu Wu
γ-Glutamyl transpeptidase (GGT) plays crucial roles in some physiological processes . Herein a turn-on fluorescent probe for γ-glutamyl transpeptidase (GGT) assay based on aggregation-induced-emission (AIE) effect and the enzyme-induced transformation of hydrophilicity to hydrophobicity has been developed by functionalizing tetraphenylethylene (TPE) derivative with two γ-glutamyl amide groups, which simultaneously work as recognition units and hydrophilic groups. When the γ-glutamyl amide groups are cleaved through GGT enzymatic reaction , the hydrophobic reaction product readily aggregate and correspondingly strong blue fluorescence can be observed, as a result of activated AIE process. By virtue of the probe's good solubility in totally aqueous solution, high sensitivity and excellent photostability, the probe can be employed to detect GGT level in human serum samples. Furthermore, the probe can be used for imaging endogenous GGT in living A2780 cells. Hence, the probe holds great promise for acting as a convenient one-step straightforward assay for GGT detection in diagnostic-related applications, and also it could provide a useful approach for conducting pathological analysis for diseases involving GGT.
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PubMed
高影响因子
BIOSENSORS & BIOELECTRONICS
·
2016
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IF 7.476
Rongli Zhang,Sheng Xu,Ye Zhu,Wei Zhao,Jing Luo,Xiaoya Liu,Dingxing Tang
A voltammetric sensor for melamine (MEL) was prepared from molecularly imprinted nanohybrids (MINBs). A dopamine modified poly-γ-glutamic acid copolymer (γ-PGA-DA) and MEL were self-assembled into MEL/γ-PGA-DA nanoparticles (NPs) in aqueous solution via weak interactions, followed by adding an aqueous AgNO 3 solution into the mixture. The Ag + was adsorbed in the MEL/γ-PGA-DA NPs and spontaneously reduced to Ag NPs by the dopamine moieties of γ-PGA-DA, forming Ag/MEL/γ-PGA-DA MINBs, which were then cast on a gold electrode to form a MINBs film. The MEL was removed by electrolysis via catalysis of Ag NPs at a constant potential of 1.4 V in phosphate buffer saline solution , to obtain a voltammetric sensor for MEL. The sensor responded linearly to MEL in the concentration range of 5×10 −18 to 5×10 −7 mol L −1 . Compared to other published molecularly imprinted polymer sensors for sensing MEL, the prepared MINBs sensor had much wider detection range with lower detection limit.
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CARBOHYDRATE POLYMERS
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2016
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IF 4.219
Qianhong Gao,Jiangtao Hu,Rong Li,Lijuan Pang,Zhe Xing,Lu Xu,Mouhua Wang,Xiaojing Guo,Guozhong Wu
A new kind of non-fluorine-based organic-inorganic hybrid superhydrophobic cotton fabric was successfully prepared by simultaneous radiation-induced graft polymerization of γ-methacryloxypropyl trimethoxy silane (MAPS) and subsequent end-capping modification with hexamethyldisilazane (HMDS). The chemical structure and surface topography of the pristine and modified cotton fabrics were investigated in detail by ATR-FTIR, XPS, 29 Si NMR, SEM and TGA to confirm that the graft reaction and end-capping modification had taken place. The above results demonstrated that the grafting polymerization and following end-capping reaction were completed, and a grafting layer was immobilized onto the surface of the cotton fabric. Surface wettability measurement and oil-water separation showed that the modified cotton surface not only exhibited the superhydrophobicity with a water contact angle of 165°, but also afforded a high efficiency of oil-water separation (96%). In particular, this modified cotton fabric retains superhydrophobicity even after 30 laundering cycles or 400 cycles of abrasion.
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PubMed
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ENERGY & FUELS
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2017
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IF 3.091
Haizhou Lin,Jingping Chen,Yuan Zhao,Shurong Wang
To obtain an efficient and green reaction system for the production of furfural (FF), this study investigated the use of a SO3H-functionalized ionic liquid as a catalyst for the conversion of xylose in a solvent of renewable γ-valerolactone (GVL). A high FF yield of 78.12% was obtained in this reaction system catalyzed by 1-propylsulfonic-3-methylimidazolium chloride at 140 °C. The GVL remarkably enhanced the reaction rate and increased the xylose conversion and FF yield because the solvent effect of GVL could improve the catalytic activity of the acidic protons and suppress the side reactions. In addition, the ionic liquids showed satisfactory catalytic performance in the conversion of xylose to FF due to functionalization by introducing a SO3H group. The conversion of other C5 carbohydrates (arabinose and xylan) was also tested in this system, and moderate FF yields were achieved.
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CATALYSIS TODAY
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2016
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IF 4.312
Kun Jiang,Dong Sheng,Zihao Zhang,Jie Fu,Zhaoyin Hou,Xiuyang Lu
Mixed MgO–Al 2 O 3 (with different Mg/Al ratio) supported nickel catalysts were prepared via co-precipitation method and used for hydrogenation of levulinic acid to γ-valerolactone under mild condition. Characterization results indicated that mixed MgO–Al 2 O 3 supported Ni catalysts possessed bigger surface area than that of Ni/MgO and Ni/Al 2 O 3 , and Ni dispersed highly on the surface of mixed MgO–Al 2 O 3 support. It was found that mixed MgO–Al 2 O 3 supported Ni catalysts were more active and selective for the hydrogenation of levulinic acid to γ-valerolactone than that of Ni/MgO and Ni/Al 2 O 3 , and the best yield of γ-valerolactone at 160 °C, 1 h and 3 MPa H 2 reached 99.7% over Ni/MgAlO 2.5 , and Ni/Mg 2 Al 2 O 5 could be recycled without obvious loss of its initial activity.
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RSC Advances
·
2017
·Vol. 7
·期 70
·44523-44530
·
IF 3.108
Lichen Xia,Lujun Pan,Muhammad Asif,Dongmei Zhang,Muhammad Usman,Shuaitao Yang,Nan Zhou,Yunping Hu,Yuezhen Bin
Ternary composites as electrode materials have attracted extensive attention due to their excellent electrochemical performance in energy-storage technologies as compared to single or binary composites. Herein, we demonstrated a facile two-step method to construct a new hierarchical nanocomposite by combing buckypaper (BP) with γ-MnOOH nanorods and polyaniline. BP is used as a conductive substrate for the synthesis of free-standing hierarchical electrodes. The structural characterizations revealed the growth of a hierarchical porous structure of the ternary electrode. The synthesized polyaniline@γ-MnOOH–BP ternary composite electrode shows a maximum specific capacitance of 567.5 F g−1 at a current density of 0.5 A g−1 and a relatively high areal capacitance of 301.2 mF cm−2 at a current density of 0.27 mA cm−2. This intriguing result is ascribed to the good combination of BP, γ-MnOOH, and PANI. We believe that this ternary composite electrode has potential in portable, environmentally friendly, and wearable applications for next generation energy-storage devices.
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CATALYSIS COMMUNICATIONS
·
2013
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IF 2.915
Shuai Leng,Xinde Wang,Xiaobo He,Lin Liu,Yue'e Liu,Xing Zhong,Guilin Zhuang,Jian-guo Wang
NiFe bimetallic catalyst shows an excellent activity and selectivity for the hydrodeoxygenation (HDO) of three typical model compounds of bio-oil. The conversion of furfuryl alcohol, benzene alcohol and ethyl oenanthate is 100, 95.48 and 97.89% at 400 °C and the yield to 2-methylfuran, toluene and heptane is 98.85, 93.49 and 96.11% at 0.1 ml/min flow speed and atmospheric pressure. It indicates that the major reaction pathway is the cleavage of C–O rather than C–C. After the catalytic HDO of bio-oil over NiFe/Al 2 O 3 catalyst, the heating value changes from 37.8 to 43.9 MJ/kg, the pH changes from 6.65 to 7.50.
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Materials Science & Engineering C-Materials for Biological Applications
·
2013
·
IF 2.404
Junmin Qian,Xueqing Yong,Weijun Xu,Xinxia Jin
An ideal scaffold in bone tissue-engineering strategy should provide biomimetic extracellular matrix-like architecture and biological properties. Poly( γ -benzyl-L-glutamate) (PBLG) has been a popular model polypeptide for various potential biomedical applications due to its good biocompatibility and biodegradability. This study developed novel bimodal porous PBLG polypeptide scaffolds via a combination of biotemplating method and in situ ring-opening polymerization of γ-benzyl-L-gIutamate N -carboxyanhydride (BLG-NCA). The PBLG scaffolds were characterized by proton nuclear magnetic resonance spectroscopy, X-ray diffraction, differential scanning calorimetry, scanning electron microscope (SEM) and mechanical test. The results showed that the semi-crystalline PBLG scaffolds exhibited an anisotropic porous structure composed of honeycomb-like channels (100–200 μm in diameter) and micropores (5–20 μm), with a very high porosity of 97.4 ± 1.6%. The compressive modulus and glass transition temperature were 402.8 ± 20.6 kPa and 20.2 °C, respectively. The in vitro biocompatibility evaluation with MC3T3-E1 cells using SEM, fluorescent staining and MTT assay revealed that the PBLG scaffolds had good biocompatibility and favored cell attachment, spread and proliferation. Therefore, the bimodal porous polypeptide scaffolds are promising for bone tissue engineering.
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高影响因子
RSC Advances
·
2014
·Vol. 4
·期 48
·25106-25113
·
IF 3.708
Rong-li Zhang,Sheng Xu,Jing Luo,Dong-jian Shi,Chen Liu,Xiao-ya Liu
Nanohybrids, comprising gold nanoparticles (Au NPs) and polymer NPs have attracted significant attention in recent years due to their excellent physical and chemical properties. In this work, a novel kind of nanohybrids based on Au NPs and biocompatible poly(γ-glutamic acid)-graft-3,4-dihydroxy-L-phenylalanine (γ-PGA-g-DA) NPs was conveniently achieved through a green and facile one-pot strategy. By simply adding HAuCl4·3H2O to the aqueous solution of γ-PGA-g-DA copolymer, the decrease of the pH value induced the self-assembly of γ-PGA-g-DA into NPs, during which Au3+ was adsorbed in the in situ formed NPs and spontaneously reduced to Au NPs by the dopamine moieties of γ-PGA-g-DA, leading to the formation of Au@γ-PGA-g-DA nanohybrids. In the reaction process, γ-PGA-g-DA was used as scaffold and reductant simultaneously, avoiding the use of extra toxic reducing reagents. Interestingly, the particle size and clustering of Au NPs in Au@γ-PGA-g-DA nanohybrids were varied with the loadings of HAuCl4·3H2O. This one-pot preparation process is very simple, fast, and completely based on the principles of green chemistry. Furthermore, the resultant biocompatible Au@γ-PGA-g-DA nanohybrids were used to detect L-tryptophan and exhibited a good analytical performance. The novel Au@γ-PGA-g-DA nanohybrids are a promising system for detecting the amino acids and biological species.
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