CHINESE JOURNAL OF POLYMER SCIENCE
·
2024
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IF 4.1
Xiao Le-Ping,Qiu Lv-Ming,Wu Zhen,Wang Guo-Jie
To realize single-stimulus-induced simultaneous multi-behaviors in hydrogels is still quite challenging nowadays. Herein, an intelligent pH-responsive hydrogel (BP4VA/PAS) with rapid and high contrast changes in color, fluorescence, and shape simultaneously is reported. The BP4VA/PAS hydrogel is fabricated by incorporating styryl anthracene derivative (BP4VA) into copolymer networks (PAS) of acrylamide and sodium 4-styrene sulfonate. Under acid conditions, the protonation of BP4VA generates a rapid change with high color contrast from yellow to red and a fluorescence switch between bright green and weak red emission. At the same time, the electrostatic interactions between 2H-BP4VA 2+ and sulfonate anions suspended on PAS trigger BP4VA/PAS hydrogels to shrink. Upon alkaline treatment, the 2H-BP4VA 2+ /PAS hydrogel deprotonates and recovers to its original color, fluorescence, and shape. Furthermore, utilizing rapid and remarkable pH-responsive properties of BP4VA/PAS hydrogels, we successfully demonstrated its applications in biomimicry, camouflage, and multistage information encryption. Collectively, this work provided an elegant strategy to develop intelligent hydrogels in applications of biomimetic smart materials and information encryption.
研究领域:
材料科学
·
生物仿生学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2024
·
IF 3.3
Qihong Zhang,Xinyu Lin,Weike Su
BACKGROUND In this study, the content and structure of Polygonatum sibiricum polysaccharides and saponins during different processing stages were determined. RESULTS After processing of Polygonatum , the content of polysaccharide and glucose decreased, and the content of galactose, glucuronic acid and sugar substitution gradually increased. The content of total saponins increased significantly. Only 18 compounds were found in raw Polygonatum and 17 new compounds were presented in processed Polygonatum . During the processing of Polygonatum , the polysaccharide was partially degraded into oligosaccharides, the molecular weight gradually decreased, and the neutral sugar was converted into uronic acid, resulting in a decrease in polysaccharide content. The saponins were partially degraded into sapogenins or modified. CONCLUSION This study clarifies the changes in the content and structure of polysaccharides and saponins in processed Polygonatum , which will pave the way for elucidating the processing mechanism. © 2024 Society of Chemical Industry.
研究领域:
药用植物学
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植物化学
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中药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Jing Zhang,Honghui Wang,Yingmin Liao,Yan Li
The co-contamination of heavy metal ions and organic pollutants has posed a threat to human health. Herein, this study investigated the intermolecular interactions of bisphenol S (BPS) and hexavalent chromium (Cr(VI)) under both individual and coexisting conditions, with alpha-glucosidase (AG), a key enzyme in carbohydrate metabolism, and the corresponding effects on the structure and function of AG. Multiple spectroscopic and molecular docking methods were employed to conduct the investigation in vitro and in silico . The results indicated that both BPS and Cr(VI) quenched the fluorescence of AG via a combined static and dynamic quenching processes. At 310 K, the binding constants of AG with BPS in the AG-BPS and (AG-Cr(VI))-BPS systems were 1.84 × 10 4 and 2.03 × 10 4 L mol −1 , and the binding constants of AG with Cr(VI) in the AG-Cr(VI) and (AG-BPS)-Cr(VI) systems were 6.14 × 10 3 and 4.35 × 10 3 L mol −1 . Cr(VI) could significantly affect the binding site of BPS in AG, while BPS had a minimal impact on the binding site of Cr(VI) in AG. BPS and Cr(VI) caused varied structural alterations of AG, and the impact of their coexistence on the structure of AG was related to the order in which they were added. Both BPS and Cr(VI) had a concentration-related effect on AG activity. This study provides valuable insights into the molecular mechanisms underlying the combined toxic effects of BPS and Cr(VI) on AG, highlighting the potential health risks associated with their environmental co-exposure.
研究领域:
环境科学
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分子生物学
·
毒理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2024
·
IF 10.7
Yingge Shi,Xuyuan Yang,Yongqiang Zhang,Siyu Lu
Soft actuators for intelligent robots require further elaboration to improve their biomedical applicability, which has led to the development of a series of flexible stimulus-responsive materials. However, fabricating degradable soft actuators that exhibit synergistic color and shape changes in response to environmental stimuli remains challenging. Here, we developed a soft actuating gel based on carbon dots (CDs) that are chemically cross-linked with sodium alginate. The soft actuating gel exhibits rapid synergistic changes in color and shape in response to pH owing to CDs protonation and deprotonation. Soft actuators constructed using the gel and poly (lactic acid) tape not only perform actions, such as grasping and lifting, but also camouflage and warn through self-color changes. The combination of pH-responsive CDs and degradable polymers provides a simple strategy for fabricating degradable soft actuators that exhibit synergistic changes in color and shape, and is expected to promote further research into soft actuators.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Shuaibing Wang,Xiaomin He,Gaopeng Wang,Si Yu Zheng,Jintao Yang
Bilayer hydrogels, endowed with multiresponsive and switchable color-changing properties, have garnered significant attention for bioinspired artificial intelligent materials. However, the design and fabrication of such hydrogels that can fully mimic the adaptation of the live organism, i.e., simultaneous changes in shape, fluorescent, and/or visible color, still remain significant challenges. Herein, a multiresponsive (e.g., temperature, salt, and pH) and multiadaptive (shape, fluorescent color, and visible color changes) hydrogel was fabricated by employing monomers featuring pH-responsive fluorescence 4-(2-(4-(dimethylamino) phenyl)-1-isocyanovinyl) phenol (DP) and switchable color-changing 4-(2-sulfethyl) −1-(4-vinylbenzyl) pyridinium betaine (VPES). The bilayer hydrogel comprises a temperature- and pH-responsive gel layer, poly(N-isopropylacrylamide-co-2-(dimethylamino) ethyl methacrylate), along with a pH-, temperature-, and salt-responsive gel layer, poly(acrylamide-co-2-(dimethylamino)ethyl methacrylate-co-VPES)@DP. Due to the opposite swelling/shrinking behavior between the two layers, the prepared hydrogel exhibits shape changes in response to thermal, salt, and pH stimuli, along with switchable fluorescent color and visible color change that originate from DP and polyVPES, respectively. Apart from multiresponsive behavior, this hydrogel also shows an excellent antifatigue property and high sensitivity, which makes it hold significant potential in many applications. We anticipate that this strategy to realize multiresponsive capability in this work can also inspire the design of the biomimetic smart materials.
研究领域:
材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
IEEE Geoscience and Remote Sensing Letters
·
2021
·
IF 3.966
Keren Dai,Ningling Wen,Xuanmei Fan,Jin Deng,Lele Zhang,Rubing Liang,Jie Liu,Qiang Xu
In the context of global warming, monitoring glacial lakes is of great significance for revealing climate change and mitigating glacier lake outburst floods (GLOFs). Multitemporal mapping of glacier lakes through optical satellite remote-sensing imageries can only provide us comparative analysis of glacier lake changes during long time intervals. In recent years, the rapid development of synthetic aperture radar (SAR) has made it possible to observe seasonal changes of glacial lakes. This letter proposed a polarization enhancement-based maximum interclass variance (PE-MIV) method to accurately and automatically mapping the seasonal cycles of glacial lakes based on multipolarization SAR data. Taking the Gongcuo and Langcuo glacial lakes in Laigu village, Tibetan Plateau, as examples, based on 113 Sentinel-1 SAR imageries covering 2017 to 2020 with a 12-day revisiting time, the seasonal boundary changes of both lakes were extracted automatically with a relative accuracy of 93.59%. The seasonal variations of glacial lake area are closely related to temperature and precipitation. This letter demonstrated that the satellite SAR (short revisiting time, multipolarization, etc.) is an effective tool to monitor areal changes of glacier lakes, which can be widely applied in detecting glacier lakes, GLOFs, and their response to climate change.
研究领域:
遥感监测
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冰川学
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气候学
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环境变化
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
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2021
·
IF 7.514
Jun-Hu Cheng,Ya-Qi Chen,Da-Wen Sun
Effects of plasma-activated solution (PAS) on the colour and structure of metmyoglobin (metMb) and oxymyoglobin (oxyMb) were investigated and the relationship between discolouration and structure changes was clarified for the first time. Results showed that the colour of PAS-treated metMb faded first, followed by green discolouration, while PAS-treated oxyMb turned from bright red to reddish-brown and then towards green in the end. It was due to the accumulation of H 2 O 2 , nitrite and nitrate in PAS with prolonging plasma treatment times. Also, the low concentrations of active species in PAS cannot influence the colour and structure of metMb and oxyMb. The accumulation of active species of H 2 O 2 in PAS was the main reason for destructing myoglobin structure and transforming its colour with prolonging treatment time. Therefore, the concentration of H 2 O 2 should be adjusted to a low level for treating red meats as their colour appearance is mainly determined by metMb and oxyMb.
研究领域:
食品科学
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生物化学
✓ 已验证
DOI
PubMed
高影响因子
POLYMER
·
2024
·
IF 4.1
Ruiming Jia,Li Yang,Zhe Wang,Hong Chen,Ming Xiao
Electrochromic materials that integrate structural colors and dielectric elastomer actuators (DEAs) can simultaneously change colors and shapes upon voltages. Typically, operation voltages for these materials are high, reaching several kilovolts. To achieve color changes at lower voltages, we reduce the modulus by lowering silica nanoparticle volume fraction and adding a secondary acrylate monomer, while also ensuring that photonic elastomers maintain recognizable colors. We utilize binary silica nanoparticles to make photonic glass elastomers that show angle-independent structural colors. The photonic glass DEA shows color changes of 85 nm at 800 V with color change sensitivity of 0.11 nm/V, surpassing previous reports. By making a double-layered DEA, we can not only control the shape changes, but also increase the color contrast. This solid-state elastic electrochromic material, offering programmable color change and shape morphing, holds broad applications in wearable devices, camouflage, and flexible displays.
研究领域:
材料科学
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光学
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纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Kaiyu Zhang,Qinxing Sun,Changxu Lin,Weina Li
Developing multiple visual signals to reveal comprehensive information of metal ions with simplest operations is attractive and significant for on-site detection. In this paper, wettability tunable surfaces were fabricated to selectively detect Hg 2+ ions based on contact angle (CA) variation and colorimetric change. Firstly, hydrophobic nanopin surfaces were fabricated through a chemical bath deposition method and fully characterized by FTIR, XRD, SEM and TEM. Then chitosan stabilized silver nanoparticles (AgNPs) were deposited onto the hydrophobic surfaces to introduce reactants for detecting metal ions. By varying the concentration of AgNPs, the surface wettability can be regulated and the CA are tuned ranging from 152.1 ± 1.0° to 128.9 ± 0.6°. As addition of Hg 2+ ions, the CA of AgNPs modified hydrophobic surfaces decrease obviously and surface color changes from brown to white, which are attributed to the vanishment of AgNPs based on the redox reaction between AgNPs and Hg 2+ ions and the simultaneously destruction of the nanopin surface structure. A linear relationship between the CA changes and Hg 2+ concentration was achieved over the range of 10 −6 M–10 −2 M and the limit of detection (LOD) is calculated to be 2.6 × 10 −7 M. In addition, this strategy was also applied to detect Hg 2+ in the real water samples with recoveries ranged from 98.0% to 107.0%. This method introducing both CA variation and colorimetric change as signals provides a new avenue for developing multiple on-site detection signals of metal ions by naked-eye.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Xi He,Fuli Xu,Fei-Fei Chen,Ying-Jie Zhu,Yan Yu
Graphene oxide (GO) fire warning sensors have received much attention in the last 5 years. However, GO sensors still suffer from a high response temperature (above 100 °C) and short duration time of fire warning. In this work, an asymmetric nanocomposite paper based on color and resistance switching was developed to overcome these issues. The top surface consists of poly(pentacosadiynoic acid) [poly(PCDA)] and hydroxyapatite (HAp) nanowires, which gives the alarm by a color change from purple to red at 55 °C due to the conformational distortion of the poly(PCDA) backbone. On the other hand, the bottom surface is made of 3-aminopropyltriethoxysilane (APTES)-modified GO nanosheets and HAp nanowires, which sends out alerts within 1 s in fire by means of resistance change due to the thermal reduction of GO. It is found that the APTES molecules effectively enhance flame retardancy of GO by releasing nonflammable gases and producing a protective solid barrier. As a result, long-lasting fire warning has been realized.
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 11
·1547
·
IF 4.7
Yuxin Sun,Xinye Qian,Yan Gou,Chunling Zheng,Fang Zhang
Cellulose detectors, as green sensors, are some of the defensive mechanisms of plants which combat environmental stresses. However, extracted cellulose struggles to fulfil these functionalities due to its rigid physical/chemical properties. In this study, a novel cellulose dual-crosslinked framework (CDCF) is proposed. This comprises a denser temporary physical crosslinking bond (hydrogen bonding) and a looser covalent crosslinking bond (N,N-methylenebisacrylamide), which create deformable spaces between the two crosslinking sites. Abundant pH-sensitive carboxyl groups and ultralight, highly porous structures make CDCF response very sensitive in acid/alkaline vapor environments. Hence, a significant shrinkage of CDCF was observed following exposure to vapors. Moreover, a curcumin-incorporated CDCF exhibited dual shape and color changes when exposed to acid/alkaline vapors, demonstrating great potential for the multi-detection of acid/alkaline vapors.
研究领域:
材料科学
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化学工程
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2024
·
IF 8.5
Puli Hu,Hongzhi Liang,Beier Kong,Jinjiang Lv,Aori Qileng,Hongshuai Zhu,Yingju Liu
Accurate consumer perception of food packages should provide real-time feedback on any changes inside food packaging. Hence, a new multilayer gas-sensitive label (POA-12) was prepared using a layer-by-layer pouring method for simple, visual, and real-time detection of pork's freshness, while the front side was developed by immobilizing red carbon dots and fluorescein isothiocyanate in POA as indicator for volatile nitrogen, and the back side was created using bromothymol blue in POA as pH indicator. The swelling index of the multilayer gas-sensitive labels reduced from 159.19% to 148.36%, and the tensile strength increased from 25.52 MPa to 42.61 MPa. In addition, the POA-12 multilayer label showed a red-to-yellow fluorescence change as TVB-N increased from 6.84 to 31.4 and a yellow-brown-to-blue-green color change as pH increased from 5.74 to 7.24 when detecting pork samples. Thus, it provides dual-indicator monitoring that improves the accuracy and reliability of assessing the freshness of high-protein products.
研究领域:
食品科学
·
材料科学
✓ 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）