CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2016
·
IF 1.207
Cunyu Li,Yun Ma,Hongyang Li,Guoping Peng
With the rapid increase of water contamination, membrane separation technology and their corresponding molecular weight cut-off (MWCO) evaluation method become more necessary. In this study, Panax notoginseng saponins was used as a new standard marker to determinate ultrafiltration (UF) membrane MWCOs, series of Millipore membranes were selected as control group to analyze and calculate the relationship between retention rate and MWCOs with exponential or logarithmic equation. A new and convenient method was provided for determining the membrane MWCO by modeling analysis retention rate with MWCOs, and the regression coefficients ≥ 0.990. The feasibility and practicability of established method was verified by different manufactures' membrane and dextrans . In the detection progress, as the main ingredient of Panax notoginseng saponins , Notoginsenoside R 1 , Ginsenoside Rg 1 , Ginsenoside Rb 1 and Ginsenoside Rd with different surface activity, the MWCO range of UF membranes can be divided into two zones mainly due to the retention rate difference among Notoginsenoside R 1 , Ginsenoside Rg 1 , Ginsenoside Rb 1 and Ginsenoside Rd . Zone I, 1000–10000; and Zone II, 10000–100000. Thus, the new method would be helpful to improve the applicability of UF membrane in separation technology.
研究领域:
环境科学
·
药学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 8
·6274-6282
·
IF 3.201
Shuang Chen,Hao Wu,Jing-han Hua,Jing-wen Yang,Hong-bin Zhang,Xue-qin Hu
Dextran is a polysaccharide with a high medicinal value. Thus, the chemical modifications of dextran, and the structural and physicochemical properties of its derivatives should be given focus. Dextran (Mw 5000 Da to 7500 Da) can complex with iron. In this study, dextran (Mw 5400 Da) was modified at different pH levels (8–14) by using NaOH and NaClO/NaBr. The carboxyl groups of the modified dextran were determined using infrared spectroscopy, and the carboxyl contents were compared. The results of high-performance liquid chromatography indicated that dextran was degraded during the modification. The crystallization and the structure of the carboxyl-modified dextran were investigated using X-ray diffraction, nuclear magnetic resonance, and quadrupole time-of-flight mass spectrometry. The physicochemical properties, i.e., solubility, and granule morphology, of the carboxyl-modified dextran were carefully characterized and compared. This work provides a theoretical foundation for the accurate selection of carboxyl-modified dextran and the development of a novel strategy for the preparation of metal complexes.
研究领域:
生物化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Dehua Liang,Jiguang Huang,Yuntao Zhang,Zheng Zhang,Haiping Chen,Heng Zhang
In this paper, in order to reduce the preparation cost of high-performance ceramic membrane , coal fly ash-based tubular ceramic membrane for flue gas moisture recovery was prepared, and its properties were optimized from two aspects: pore-forming agent (dextrin) content and sintering temperature . The results show that the ceramic membrane with dextrin content of 3 wt.% and sintering temperature of 1150 ℃ has the best performance. Through characterization, the ceramic membrane exhibits an open porosity of 42.0 %, mechanical strength of 26.6 MPa, average pore size of 0.49 μm, pure water flux of 5616 L/(m 2 barh). And, it has excellent corrosion resistance in acid and alkali. In addition, the flue gas moisture recovery performance of coal fly ash-based tubular ceramic membrane was studied experimentally. The highest water recovery ratio and the highest recovered water flux is 87.7 % and 6.01 kg/(m 2 h, respectively.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY
·
2025
·
IF 3.1
Wang Boyan,Luan Wenjing,Li Qiang,Jiang Weihong,Zhang Lei,Lyu Mingsheng,Wang Shujun
Porous starch is a type of modified starch that contains a high number of tiny micropores. Due to its natural absorbent properties, porous starch has broad application prospects. Currently, enzymatic hydrolysis is predominantly used for production of porous starch, however, the hydrolysis efficiency is relatively low. In this study, sweet potato porous starch was prepared by combining physical pretreatments with dextranase, and then its adsorption properties were investigated. Ultrasonic, moist heat, and microwave pretreatment methods were used, and the structure, physicochemical properties, and adsorption capacity of resulting porous starches were detected. The microwave-combined enzymatic hydrolysis resulted in a porous starch with more compact pore structure in a shorter time. Additionally, no new chemical groups were observed in the porous starch. The treatment not only increased the solubility of starch to 5.22%, but likewise reduced the swelling power to 6.92%. Furthermore, adsorption capacity of the starch improved remarkably due to increased porosity and specific surface area. Specifically, the oil absorption improved from 51.02 to 102.79%, while the water absorption improved from 58.63 to 120.40%. This study provides an efficient method to produce porous starch from sweet potato with enhanced water and oil absorption capacity, which has promising applications in the food and pharmaceutical industries.
研究领域:
食品科学
·
生物化学
✓ 已验证
DOI
高影响因子
eFood
·
2024
·Vol. 5
·期 3
·e147
·
IF 4
Biyang Zhu,Liuting Li,Kseniya Hileuskaya,Baojun Xu,Lijun You
Although ultraviolet (UV)/H 2 O 2 treatment could effectively improve the bioactivities of polysaccharides, the relationship between free radical-induced structural changes and the bioactivities of products remains unknown. Therefore, this work investigated the changes in the chemical characteristics and chain conformations of degraded dextrans by the UV/H 2 O 2 system as well as their antioxidant and anti-inflammatory activities. The apparent degradation efficiencies of dextrans under different UV/H 2 O 2 parameters were first investigated. UV/H 2 O 2 treatment effectively destroyed the pyranose rings and glycosidic bonds of dextrans and significantly improved their uronic acid and carboxy contents. Furthermore, conformational studies revealed that besides the rapid decrease in the molecular weight, the compact spherical conformation of dextrans was gradually depolymerized into the flexible random coil conformation. Moreover, the significant antioxidant and anti-inflammatory activities of the degraded dextrans were mainly attributed to their more extended random coil chains, increased quantity of reducing groups, and lower molecular sizes. This study contributes to investigating the structure–activity relationship of polysaccharides prepared by free radicals-mediated degradation.
研究领域:
化学
·
药学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Hong Chen,Zhengwen Ding,Dawei Yan,Haosheng He,Wenjing Xi,Jinbo Hu,Rongguang Zhang,Yonggang Yan,Qiyi Zhang
The biodegradable hydrogels with a 3D network structure have potential applications in bone tissue engineering. Here, inspired by natural bone, the novel organic-inorganic composites (GelMPC-x) with high compressive strength are designed via adding magnesium oxide/calcium dihydrogen phosphate (MPC) powders into the oxidized dextran/gelatin (OD/Gel) hydrogel. GelMPC-x composites can trigger the gelation of OD/Gel hydrogel through an acid-alkaline reaction between magnesium oxide and calcium dihydrogen phosphate, thus forming an organic-inorganic double network. The cross-linked network between oxidized dextran and gelatin, and the multiple weak interactions between OD/Gel hydrogel and MPC enable the composites to have remarkable compressive strength (77–652 kPa) at the strain of 44 %. More importantly, the composites with appropriate MPC content possess superior injectability, high porosity, and excellent cytocompatibility. This work provides guidelines for the preparation of oxidized dextran-based composite hydrogels with enhanced mechanical performance.
研究领域:
生物材料学
·
组织工程学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Xinyue Shen,Donghui Zhao,Junyi Shi,Chaoqing Li,Yang Bai,Lin Qiu,Yang Xuan,Jianhao Wang
Bacterial infection and tissue hypoxia always prevent wound healing, so multifunctional platforms with antimicrobial and oxygen-supplying functions were developed. However, they face many difficulties such as complex preparation and low oxygen release. To address this challenge, a copper peroxide loaded gelatin/oxide dextran hydrogel (CGO) was prepared. Surprisingly, CGO hydrogel as a wound dressing not only had good biocompatibility , injectivity, and mechanical properties, but also exhibited mild photothermal properties, temperature responsiveness, and pH responsiveness. After being applied to wounds infected with bacteria, CGO hydrogel released copper peroxide under near-infrared laser irradiation, which produced copper ions and hydrogen peroxide , combined with PTT to kill bacteria. After the bacteria were cleared from the wound and the pH of the wound was changed to be acidic, CGO hydrogel released copper peroxide via pH response. Copper ions and oxygen produced from copper peroxide accelerated wound healing by promoting angiogenesis. The multi-responsive and multi-mode treatment platform provided a potential strategy for treating bacteria-infected wounds.
研究领域:
生物材料学
·
医学工程
·
组织修复与再生
✓ 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）