INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Siying Ye,Yonghui Zhang,Jun Chen,Fuquan Chen,Huifen Weng,Qiong Xiao,Anfeng Xiao
Agar is modified by chemical methods to improve its functional properties and meet the increasing demand of the market. Some of the functional properties of agar are improved after chemical modification, while other properties are reduced, especially gel strength. This study aimed to comprehensively improve the functional properties of agar through acylation and crosslinking by reacting with maleic anhydride. 13 C NMR indicated the maleylation reaction was preferred at the C2 hydroxyl group of D-galactose, and the crosslinking reactions occurred at the C2 and C6 hydroxyl groups of D-galactose in different agar chains. Interestingly, the maleylated agar monoester had higher gel transparency (1.5%, w/v) of up to 76% than the native agar (58%). However, it showed a significant decrease in gel strength from 783 g/cm 2 to 403 g/cm 2 , while crosslinking endowed agar with higher gel strength (845 g/cm 2 ) and gel transparency (78.4%). The high transparency of the modified agar plate made colony observation and colony counting easy. Maleylation of agar further enhanced the freeze–thaw stability of agar gel (24.8%, 7th freeze–thaw cycles). Overall, the maleylated agar possessed superior functional properties, and it could be used as food, bacteriological, and biotechnological agar.
研究领域:
食品科学
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生物技术
·
化学
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DOI
PubMed
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2019
·Vol. 321
·期 2
·733-745
·
IF 1.186
Hu Peizhuo,Nan Yu,Tai Wenya,Shan Qiang,Zhong Yi,Lei Zhiwei,Liu Tonghuan,Chen Suwen,Qian Lijuan
Modification of silica gel by butanedioic anhydride (SiO 2 –BDAH) results in efficient adsorbents for removal of U(VI), Th(IV), and Eu(III) from aqueous solutions. SiO 2 –BDAH was characterized by Fourier Transform infrared spectroscopy, elemental analysis, N 2 adsorption–desorption isotherms, thermogravimetic analysis, and potentiometric titration. The effect of contact time, pH, and initial concentration of radioactive solutions and temperature on the adsorption capacity of the sorbent was investigated. The sorption equilibrium times of U(VI), Th(IV), and Eu(III) onto SiO 2 –BDAH were 1.5, 2, and about 10 h. The sorption percentages of U(VI), Th(IV), and Eu(III) increased with increased pH from 1 to 5. The sorption process of U(VI), Th(IV), and Eu(III) can be described by the Langmuir model, with sorption capacities of 5.10 × 10 −5 , 5.06 × 10 −5 , and 3.44 × 10 −5 mol/L, respectively. The enthalpy and entropy changes were all positive, whereas the free energy changes were negative. This study indicated that SiO 2 –BDAH can remove U(VI) and Th(IV) at the same time in the presence of multiple ions from waste water quickly.
研究领域:
环境科学
·
放射化学
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DOI
高影响因子
Foods
·
2025
·Vol. 14
·期 7
·1171
·
IF 5.1
Lijuan Fu,Hongfei Chi,Hang Wei,Biao Huang,Yueyue Qiang,Mengzhu Shi,Ling Fang,Jianwei Fu
Turmeric has extensive applications in various fields, including food and medicine. However, research on turmeric starch remains relatively scarce. There is a significant lack of in-depth studies on its processing properties and starch modification abilities. In this context, octenyl succinic anhydride (OSA)-modified turmeric starches (O-MTSs) were synthesized. Subsequently, a comprehensive investigation was carried out, including property analysis, characterization, and evaluation of the emulsifying capacity. The alterations in solubility, swelling degree, syneresis, and transparency of turmeric starches before and after modification were systematically studied. The characterization of O-MTSs was conducted using a scanning electron microscope (SEM), particle size analysis, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and thermogravimetric analysis. The possibility of using O-MTS as an emulsifier to prepare Pickering emulsions was explored. The results show that O-MTS had better solubility, swelling degree, syneresis, and transparency compared to turmeric starches (TSs). The O-MTS retained a relatively intact morphology, but its particle size slightly increased, and the characteristic peak at 995 cm−1shifted to some extent. The relative crystallinity decreased from 32.59% to 18.39%, and the water-binding capacity of O-MTSs improved accordingly. O-MTSs could better stabilize Pickering emulsions as an emulsifier compared to TSs. With the increase in the degree of substitution (DS) and concentration of the O-MTS, its emulsification index (EI) demonstrated an upward trend.
研究领域:
食品科学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2021
·
IF 4.759
Xiaoping Wang,Hui Li,Kaijun Quan,Liang Zhao,Zuguang Li,Hongdeng Qiu
β -Cyclodextrin can be functionalized by derivation of reactive hydroxyl on the ring due to its special chiral environment and structural characteristics, which can be used to identify or separate a variety of chiral substance. In this manuscript, a series of excellent chiral stationary phases for high-performance liquid chromatography were developed for enantioseparation by using anhydride modified β -cyclodextrin bearing chiral ( R / S )˗ α ˗phenethylamine or ( S )-(+)-2-amino-1-propanol. They were characterized by elemental analysis, Fourier transform infrared spectra (FT-IR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and BET. These chiral stationary phases presented good resolution and repeatability, about 17 kinds of enantiomers were effectively separated. And most of enantiomers were separated better than those reported in the literature in the same both normal and reversed phase modes. The RSD values of R s for repeatability and column-to-column were below 0.44% and 2.83%, respectively. All results revealed that these new CSPs show great prospect for chiral separation in actual applications.
研究领域:
分析化学
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色谱技术
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PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 67
·38305-38314
·
IF 2.936
Yingying He,Jiang Zhu,Wentao Wang,Haitao Ni
Hydrophilic cellulose nanocrystals (CNC) are typically poorly dispersed in non-polar polymer matrices and, hence, a method for the surface modification of CNC is developed for improving this dispersion. This method included an esterification reaction with acetic anhydride, butyric anhydride, and caproic anhydride. The particle size distribution (range of sizes: 80–310 nm) of CNC was determined. The SEM-EDAX indicated that (i) the structure of CNC was maintained even after incorporation of the acid anhydride and (ii) the carbon C content of modified-CNC was higher than that of pure CNC. The chemical structure of modified-CNC was identified via FT-IR and 13C NMR spectroscopy. The contact angle of CNC and modified-CNC with water and methylene iodide was measured. The surface energy of modified-CNC was lower than that of pure CNC. Thermal-property measurements indicated that the initial decomposition temperature (based on 5 wt%) of the modified-CNC was slightly higher than that of CNC. Poly(butylene succinate) (PBS) composites were obtained by mixing modified-CNC into a PBS matrix via simple melt blending of a double screw. The PBS/modified-CNC composites were investigated via DSC and XRD. Tensile testing indicated that the tensile modulus improved gradually with increasing modified-CNC content, whereas the elongation at fracture decreased.
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
STARCH-STARKE
·
2024
·
IF 2.6
Liuyang Xiao,Jingru Zhang,Yumin Huang,Xiaofan Yang,Zhaojun Wei,Lihong Han
Very small granule starch is a good source for effective Pickering emulsion stabilizers. In this study, native Agriophyllum squarrosum ( A. squarrosum ) starch (N-AS) and native quinoa starch (N-QS) are modified by octenyl succinic anhydride (OSA), and the physicochemical as well as the emulsifying characteristics of two modified starches are evaluated. Fourier transform infrared spectroscopy (FTIR) shows that the esterification reactions between OSA and the two starches are successful, and the substitution effect of OSA-modified A. squarrosum starch (OSA-AS) is better than that of OSA-modified quinoa starch (OSA-QS). X-ray diffraction (XRD) analysis shows that OSA modification does not alter the crystal type of the starch particles. OSA modification increases the particle size and hydrophobicity of both starches, and the particles of OSA-AS are smaller than that of OSA-QS, which corresponded to the fact that N-AS possesses a smaller particle size compared to native N-QS. OSA-modified starches are arranged at the interface of oil–water to stabilize the emulsion. The OSA-AS displays better performance of stabilizing emulsion than OSA-QS. The Pickering emulsions formed by all OSA-modified starch samples are mainly elastic gel-like emulsions. In summary, OSA-AS is more suitable for Pickering emulsion stabilizer than OSA-QS.
研究领域:
食品科学
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材料科学
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DOI
高影响因子
Plasmonics
·
2016
·Vol. 11
·期 6
·1573-1578
·
IF 2.146
Zhang Xianhui,Zheng Lei,He Yi
We report a simple, facile, selective, and highly sensitive colorimetric sensor for nitroguanidine explosive. The colorimetric sensor utilizes the aggregation of creatinine-modified gold nanoparticles (AuNPs), which was caused by nitroguanidine via hydrogen bond interaction between nitroguanidine and creatinine, leading to a color change from red to blue to colorless dependent on the concentration of nitroguanidine. Under optimum sensing concentrations, the absorbance changes of AuNPs at 519 nm were linear with the concentration of nitroguanidine in the range of 15–55 μM with a correlation coefficient of 0.997. The limit of detection of the colorimetric sensor was 1 μM based on the signal-to-noise of three, which has improved by as much as five orders of magnitude as compared with the traditional volumetric method and up to three orders of magnitude as compared with fluorescence approach as well. Moreover, as low as 15 μM of nitroguanidine can be visually detected by the naked eye without instrumentation. The colorimetric sensor also displayed remarkable selectivity to nitroguanidine against other explosives and common inorganic salts. It was robust and can be employed for reliable sensing of spiked nitroguanidine in real water samples with good recovery and accuracy.
研究领域:
分析化学
·
纳米材料科学
·
爆炸物检测
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xia Jiang,Zijiao Yang,Jingyao Zhang,Huan Liang,Hongge Wang,Jiong Lu
Injectable materials have attracted great attention in the manufacture of in situ forming hydrogels for biomedical applications. In this study, a facile method to prepare methacrylic anhydride (MA)-modified sodium carboxymethyl cellulose (CMC) as an injectable material for the fabrication of hydrogels with controllable properties is reported. The chemical structure of the series of MA-grafted CMC (CMCMAs) with different MA contents was confirmed by Fourier transform infrared and nuclear magnetic resonance spectroscopy, and the properties of CMCMAs were characterized. Then, the CMCMAs gel (CMCMAs-G) was fabricated by crosslinking of MA under blue light irradiation. The gelation performances, swelling behaviors, transmittance, surface porous structures and mechanical properties of CMCMAs-G can be controlled by varying the content of MA grafted on the CMC. The compressive strength of CMCMAs-G was measured by mechanical compressibility tests and up to 180 kPa. Furthermore, the in vitro cytocompatibility evaluation results suggest that the obtained CMCMAs-G exhibit good compatibility for cell proliferation. Hence, our strategy provides a facile approach for the preparation of light-sensitive and an injectable CMC-derived polymer to fabricate hydrogels for biomedical applications.
研究领域:
材料科学
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生物医学工程
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DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Nanwei Zhu,Yue Li,Ying Huang,Fengling Ai,Boyi Wan,Minling Mao,Yejun Zhong,Chengmei Liu,Jianyong Wu
This study comprehensively characterized the interfacial behavior and emulsifying capacity of cow cockle starch (CS), both in its native form and following octenyl succinic anhydride (OSA) modification. By comparing with the most recognized quinoa starch (QS), CS showed promise as a superior alternative to QS as a particle stabilizer in food-grade emulsions. Although the microstructural similarity to QS, CS featured a smaller mean particle size of 1.39 μm and exhibited greater hydrophobicity, as evidenced by a contact angle of 19.4 ° . At equivalent levels of OSA substitution, OSA-modified CS (CS-OSA) displayed a lower critical concentration, a higher diffusion rate and a greater adsorption density compared to OSA-modified QS (QS-OSA), which facilitated quicker and denser adsorption on the droplet surface. Rheological analysis further revealed that the CS-OSA emulsion formed a stronger gel network than the QS-OSA emulsion. Consequently, CS-OSA emulsions demonstrated superior ionic, centrifugal, and storage stability compared to QS-OSA emulsions.
研究领域:
食品科学
·
胶体化学
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DOI
PubMed
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2024
·
IF 6
Yumiao Lang,Li Huang,Dandan Han,Cuiping Li,Pengsha Bian,Peng Xie,Xiaoxi Yang
In this study, different succinylation degree octenyl succinic anhydride modified myofibrillar protein (OSA-modified MP) were prepared through succinylation modification by adding various OSA (1%, 3%, 6%, 11%, 16%, 21% and 26% of the weight of MP) to MP. The structure, physicochemical properties and emulsifying properties of OSA-modified MP were investigated. Results showed that succinylation degree of the modified protein rose from 1.46% to 94.99%. Electrophoresis, fourier transform infrared spectroscopy, intrinsic tryptophan fluorescence emission spectroscopy and scanning electron microscopy demonstrated the structure of MP was changed. As the DS increased, the particle size decreased by the maximum values of 0.24 times, the surface net charge and solubility increased by the minimum values of 2.71 and 13.50 time, respectively. All these results caused emulsifying activity and emulsifying stability to increase by 2.32 and 1.46 times, respectively, indicated that succinylation greatly improved the emulsifying properties of MP. Compared to the native MP, OSA-modified MP was more beneficial to stabilize Pickering emulsion. Thus, succinylation improved the emulsifying properties of MP and effectively expanded the application range of MP in the food industry.
研究领域:
食品科学
·
蛋白质化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Chuangchuang Zhang,Mengting Ma,Yijuan Xu,Zekun Xu,Zhongquan Sui,Harold Corke
This study compared blending effects of native and octenyl succinic anhydride (OSA) modified blends (waxy rice and waxy potato starch). OSA groups were observed to be present primarily in the outer layer of waxy potato starch granule, but throughout the whole waxy rice granule. A high linear correlation with blending ratio was observed for trough viscosity and final viscosity of native blends, but for peak viscosity (PV) and breakdown viscosity (BD) of esterified blends. PV and BD of esterified blends showed weaker non-additive effects than those of native blends. Consistency coefficient in downward curve, flow behavior index in downward curve, and loss tangent mainly showed non-additive effects in native blends, but additive effects in esterified blends. OSA modification affects interaction between molecules on the outer surfaces of two starch granules by altering molecular structures on the outer surfaces, resulting in different blending effects between native and esterified waxy starch blends.
研究领域:
食品科学
·
生物化学
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DOI
PubMed
高影响因子
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
·
2024
·Vol. 113
·期 1
·e37847
·
IF 3.9
Jianing Cheng,Liguo Hao,Xiaorong Zhu,Ruifan Ma,Silong Li,Qiangqiang Yin,Dongxu Wang,Haifeng Hu,Tianyu Zhang,Zheng Li,Houyi Cong,Xiaoyang Zheng,Jun He,Yuguang Wang
Triggered by the vulnerability to atherosclerotic plaques, cardiovascular diseases (CVDs) have become a main reason for high mortality worldwide. Thus, there is an urgent need to develop functional molecular imaging modalities to improve the detection rate of vulnerable plaques. In this study, polyethyleneimine (PEI) was coated on the surface of mesoporous silica nanoprobes (MSN) loaded with Gd 2 O 3 (MSN@Gd 2 O 3 ), followed by coupling the fluorescent dye carboxylated heptamethine cyanine (IR808), and then the dextran sulfate (DS) was modified on the surface of MSN@Gd 2 O 3 @IR808 by electrostatic adsorption, to construct a targeted and pH-responsive magnetic resonance (MR)/near-infrared fluorescence imaging (NIRF) dual-modal nanoprobe (MSN@Gd 2 O 3 @IR808@DS nanoparticles). The nanoprobe presented a more concentrated distribution of spherical shapes in transmission electron microscopy. In vitro simulated vulnerable plaque microenvironment (pH = 5.5) presented significant T 1 -weighted imaging (T 1 WI) signal and longitudinal relaxation in the nanoprobe. Immunofluorescence staining and cellular uptake assays showed that MSN@Gd 2 O 3 @IR808@DS nanoparticles have the ability to specially bind to scavenger receptors A (SR-A). In vascular endothelium from the high-fat diet (HFD) New Zealand White rabbits, MSN@Gd 2 O 3 @IR808@DS nanoparticles can exhibit specific contrast-enhanced signals by MR/NIRF dual-modal imaging. In addition, cytotoxicity assays and hematoxylin and eosin (H&E) staining results demonstrated that MSN@Gd 2 O 3 @IR808@DS nanoparticles have good biocompatibility. Hence, this multifunctional MR/NIRF bimodal nanoprobe provides new experimental and technological ideas for the accurate diagnosis of vulnerable plaques.
研究领域:
医学影像学
·
生物材料学
·
心血管病学
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）