FOOD HYDROCOLLOIDS
·
2018
·
IF 5.089
Jingrong Liu,Hualin Wang,Pengfei Wang,Min Guo,Suwei Jiang,Xingjiang Li,Shaotong Jiang
Novel films based on κ-carrageenan (Car) incorporated with curcumin (Cur) were developed for freshness monitoring of foods . Cur and Car were interacted by hydrogen bonds. A low amount of Cur (no higher than 3%) could be well-dispersed in Car matrix. These characteristics significantly improved the film barrier and tensile strength, besides the enhancement of thermal stability. Hence, the Car film with 3% Cur exhibited the best performance. The films showed a good release control of Cur and a predominant Fickian diffusion release mechanism, which was favorable to sustainable pH change sensing. The Car-Cur films demonstrated a strong redness-shift under alkaline condition. This characteristic was successfully used to monitor the spoilage of pork and shrimp during storage. As a pH colorimetric indicator, the Cur incorporated Car films may have a great potential in the freshness monitoring of foods.
研究领域:
食品科学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2025
·
IF 4.2
Wenbin Zhu,Zemin Ma,Liwen Zhang,Chunbing Yang,Fujun Xu,Jiangyong Yu
Smart textiles with real-time visual monitoring abilities of environmental pH hold significant importance in wearable products. Natural dyes have gained growing interest as eco-friendly pH indicators, however, their stability and large-scale isolation remain challenging. In this work, we developed a type of pH-monitoring colorimetric indicator based on anthocyanins, a natural dye extracted from red cabbage, with enhanced affinity to cotton fiber substrates by utilizing metal salts and biopolymers. Compared to cotton fabric directly dyed with pristine anthocyanins, this colorimetric fabric demonstrates higher color contrast, superior reversibility of color change, and enhanced light and washing color fastness. The color strength (K/S) was significantly improved from 0.136 for untreated fabric to 1.266 for colorimetric fabric, and the excellent colorimetric properties maintained either after over 20 h washing or 12 h exposure to sunlight. This work addressed the issue of the easy light degradation of biomaterials, and provided a feasible optimization strategy for the development and application of environment-responsive biomass colorimetric textiles as smart and wearable products.
研究领域:
纺织科学
·
生物材料学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2020
·
IF 5.162
Shunli Chen,Min Wu,Peng Lu,Lin Gao,Shun Yan,Shuangfei Wang
A pH indicator and antimicrobial cellulose nanofibre packaging film was developed based on cellulose nanofibres as film matrix, anthocyanins from purple sweet potato as a natural dye and oregano essential oil as an antimicrobial agent. The colour of the anthocyanin solution was noticeably different from pH 2 to pH 12. The developed film sensitively responded to a change of pH and showed an obvious colour change from red to yellow, with pH ranging from 2 to 12, which indicated that the film had a superior colorimetric performance to pH change. Moreover, the film showed excellent antimicrobial activity and the inhibition rate against Escherichia coli and Listeria monocytogenes reached 99.99%. Bio-compatibility between anthocyanins and cellulose nanofibre matrix was confirmed by the analysis of cross-section morphology of the film. The XRD pattern revealed that the crystallinity index of the film decreased with the addition of anthocyanins and oregano essential oil. The film had a good barrier performance to ultraviolet and visible light; its tensile strength, elongation at break, and elastic modulus was 9.28 MPa, 9.87%, and 0.15 GPa, respectively. The developed pH indicator and antimicrobial film could intuitively indicate the change of food quality during storage and effectively prolong food shelf life.
研究领域:
食品科学
·
材料科学
✓ 已验证
DOI
高影响因子
TALANTA
·
2015
·
IF 3.545
Wen Sun,Hui Li,Han Wang,Shan Xiao,Jihui Wang,Liang Feng
The sensitivity of pH indicators is always confined in acidic solvents used during the immobilization because of the large deviation from their color transition points. By regulating the pH of indicators using organic acid or base, the color transition points of indicators could be readily achieved and the sensitivity could be greatly enhanced. In this study, bromophenol blue was selected as an example to interpret this improvement. And Hue, Saturation and Value (HSV) color model was applied to obtain digital color information of pH indicators. In addition, other two kinds of pH indicators were chosen and regulated to their color transition points as well. The resultant indicators together with the original ones were composed to a colorimetric sensor array and utilized to determine fish freshness. Compared with the original indicators, much higher sensitivity in the detection of fish freshness was obtained by the pH regulated indicators.
研究领域:
食品科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2024
·
IF 4.1
Aiming Ju,Zhiguang Xu,Zhihao Huang,Tao Zhang,Yan Zhao
Humidity-induced discoloration from surface coating is promising, but the surface suffers from low stability, due to the lack of covalent interactions between pH indicator, hygroscopic components and fabrics. Here, we report a strategy to fabricate all-polymer-based, highly hygroscopic fabrics with humidity-induced discoloration and pH-induced discoloration simply by covalently coating/polymerizing a reactive pH indicator and a hygroscopic monomer onto fabrics. The resulting fabrics show remarkable and reversible discoloration from blue to yellow, upon increasing relative humidity. The high reusability of the discoloration has been verified by repeating moisture adsorption and desorption over 20 cycles, without obvious deterioration in the discoloration behavior. Moreover, the fabrics display discoloration behaviors upon contacting aqueous solutions and vapors at different pHs. The simple coating, significant and reversible color transition, and the high reusability enable the all-polymer-based, hygroscopic fabrics to be excellent candidates for humidity indication and pH indication.
研究领域:
材料科学
·
纺织工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Jialin Sai,Lu Zhou,Lin Jiang,Dongguo Xue,Renjun Pei,Aihua Liu,Lijun Xu
Signal amplification techniques are highly desirable for the analysis of low-level targets that are closely related with diseases and the monitoring of important biological processes. However, it is still challenging to achieve this goal in a facile and economical way. Herein, we developed a novel dual signal amplification strategy by combining urease catalysis with the release of Ag+ from silver nanoparticles (AgNPs). This strategy was used for quantifying a DNA sequence (HIV-1) related with human immunodeficiency virus (HIV). DNA target HIV-1 hybridizes with the capture DNA probe on magnetic beads and the reporter DNA probe on AgNPs, forming a sandwich complex. The captured AgNPs are then transformed into numerous Ag+ ions that inactivate numerous ureases. Without catalytic production of ammonia from urea, the substrate solution shows a low pH 5.8 that will increase otherwise. The pH change is monitored by a pH indicator (phenol red), which allows for colorimetric detection. The proposed approach is sensitive, easy to use, economic, and universal, exhibiting a low detection limit of 9.7 fM (i.e., 1.94 attomoles) and a dynamic linear range of 4 orders for HIV-1 sequence detection.
研究领域:
分析化学
·
生物化学
·
纳米技术
·
病毒学
✓ 已验证
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2014
·
IF 4.517
Jintai Lin,Yuhui Zheng,Qianming Wang,Zhi Zeng,Cheng Cheng Zhang
A new type of Eu(III) ofloxacin complex as the fluorescent pH indicator has been presented. Compared to pure ligand, the complex offers more distinguished color changes (green–red–blue) derived from both lanthanide line emissions and the secondary ionization steps of ofloxacin. During the concentration dependence experiments, the photoluminescence studies on the complex showed that the excitation of this pH probe can occur at a very long wavelength which extends to visible range (Ex = 427 nm). Furthermore, the functional complex was successfully incorporated into soft networks and two novel luminescent hydrogels (rod and film) were fabricated. The soft materials also exhibited specific responses towards the pH variation. Finally, the onion cell-stain experiments were carried out to further confirm the validity of pH dependence and the results support the idea that the material will be suitable for monitoring biological samples in the future.
研究领域:
化学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 58
·35164-35173
·
IF 3.119
Juan Pang,Xincheng Mao,Jialin Xu,Xiang Zhao,Jingyang Kong,Xiaohong Hu
The application of azobenzene (AZO) as a kind of photo-switch is restricted by its excitation source, i.e., UV light. Hence, visible light-driven azobenzene-based photo-switching is needed and has been designed in the work. In order to forecast the optimal triggered wavelength, the electrostatic potential, theoretical UV-vis spectra, as well as the energy gap for focused structures was calculated to describe the energy and orbit status of the molecules by DFT. According to the theoretical optimization results, m-Methyl Red (m-MR) containing copolymer was successfully synthesized as a visible light-driven photo-switch. Further, for performance evaluation, the efficiency and effectiveness of different excitation wavelengths was firstly evaluated for the copolymer using m-MR and m-Methyl Red acrylic anhydride (m-MRAA) as the controls. Compared with m-MR and m-MRAA, the copolymer exhibited outstanding characteristics as a photo-switch according to its response–recovery behavior. At the same time, blue light proved to be the most efficient excitation light source. Moreover, the equilibrium response time and recovery time showed some dependence on the excitation wavelength. Secondly, the influence of the light intensity on the isomerization transition was investigated. A relatively low light density could lead to a relatively low degree of the final cis form and needed more equilibrium time for trans to cis transformation but showed little effect on the recovery process. Thirdly, repeatable on/off irradiation was used to evaluate the fatigue resistance of the copolymer. Good fatigue resistance without photobleaching was verified from the results. Fourthly, the influence of the solvent on visible light-driven isomerization was also evaluated. Finally, the synthesized copolymer still had the characteristic of a pH indicator with a critical point at pH 5.0 and exhibited an obvious fluorescent characteristic.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Jin-Ling Wu,Hong-Jia Xiang,Rui Zhang,Cheng-Long Wang,Yi-Xin Zhang,Ling Xiao,Zhen-Lin Xu,Hong Wang,Peng Wen
The current anthocyanin-based intelligent pH indicator has poor ultraviolet (UV) blocking performance, which results in color fading and greatly limits its application in freshness monitoring. Lignin nanoparticle (LNP), with aromatic skeleton and phenolic hydroxyl groups, is a promising green alternative to reinforce UV shielding property. Herein, a colorimetry-enhanced and UV-blocking intelligent film encapsulating purple sweet potato anthocyanin (PSPA) and LNP was developed by electrospinning poly (vinyl alcohol) (PVA) and zein. The results revealed that a bead-free and continuous microstructure was obtained for the PVA/Zein/PSPA/LNP-2 film, which also achieved excellent 99.99 % UVA and UVB blocking. Light exposure experiments showed that the incorporation of LNP significantly improved the color stability of PSPA. Besides, the film demonstrated higher tensile strength (26.98 MPa) and elongation at breaks (66.06 %). Furthermore, the nanofiber structure endowed the film with sensitive color responsiveness to detect shrimp freshness with color changing from pink to blue. These results suggested the great potential of developed nanofilm as an intelligent indicator.
研究领域:
食品科学
·
材料科学
·
纳米技术
·
高分子科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of Future Foods
·
2025
·
IF 7.2
Chao Li,Yehan Tao,Jie Lu,Jinwen Hu,Jian Du,Haisong Wang
The light-induced degradation of anthocyanin (Anth) for long time caused the color loss and poor color response when Anth was employed as the pH indicator within intelligent packaging. Herein, aiming to design smart packaging film with enhanced light stability, a sort of sodium carboxymethyl cellulose (CMC)/Anth/enzymatic lignin (CMC/Anth/EL) was proposed, in which enzymatic lignin served as the armor to protect Anth by absorbing the light. When exposed to natural illumination for 7 days, the Anth loss rate was reduced from 32.44% for pristine CMC/Anth to 3.82% for the optimized CMC/Anth/EL 3 . Moreover, the total color difference (ΔE) of CMC/Anth was reduced from 30.41 to 14.09 with the reduction of 53.67% to volatile ammonia, whereas the ΔE reduction was merely 4.34% for CMC/Anth/EL 3 . In practical application for monitoring the freshness of shrimp, the biodegradable CMC/Anth/EL 3 film presented visually discernible color response toward volatile bioamine, which was highly correlated with the freshness index, such as total volatile basic nitrogen (TVB-N, 7.26-26.67 mg/g) and pH (6.84-7.69). Our findings not only provided a new pathway to high-value utilize the waste residue, but also boosted the development of intelligent packaging with reinforced light stability.
研究领域:
食品科学
·
包装技术
·
高分子科学
·
传感器技术
·
食品安全
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Huangmei Zhou,Yu Zhao,Xihang Chen,Sanjun Zhang
pH is a fundamental physiological parameter related to myriad applications, therefore great efforts are continuously made to develop high performance pH indicators. Here, we exhaustively investigated the pH response of an acridine analog, 9-acridinecarboxylic acid with steady state absorption and fluorescence spectroscopies, picosecond resolved fluorescence spectroscopy, and femtosecond resolved transient absorption spectroscopy. The fluorescence intensity ratio (R 450/525 ) of 9-acridinecarboxylic acid showed a 7-fold change in the physiological pH range (pH ∼ 5–8), and it can be served as an excellent ratiometric and lifetime pH indicator. Analysis of the picosecond and femtosecond-resolved spectra combined with theoretical calculation revealed that 9-acridinecarboxylic acid existed in zwitterionic form at acidic condition with emission centered at 480 nm and lifetime of about 2.1 ns and anionic form at alkaline condition with emission centered at 430 nm and lifetime of about 6.6 ns. As pH decreased, the protonation of heterocyclic N atom resulted in the redshift of fluorescence peak and shortening of the fluorescence lifetime. Moreover, 9-acridinecarboxylic acid exhibited good selectivity, photostability and excellent biocompatibility and was successfully applied for intracellular pH imaging by ratiometric fluorescence.
研究领域:
分析化学
·
生物物理学
·
光谱学
·
荧光成像
·
分子生物学
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2018
·Vol. 143
·期 12
·2901-2907
·
IF 3.864
Wenyue Xie,Lingli Lei,Meiling Tian,Zeying Zhang,Yingshuai Liu
A high-resolution colorimetric immunoassay platform has been developed based on enzyme-catalyzed multicolor generation and smartphone-assisted signal readout. The multi-color generation is accomplished in this system through the urease-catalyzed urea hydrolysis-induced color change of the pH indicator phenol red, from yellow to orange to red over pH 6.6 to 8.0. The color change is easily tailored by controlling the urease activity via the inhibitor silver ion (Ag+), the amount of which is in turn adjusted by alkaline phosphatase (ALP)-catalyzed ascorbic acid (AA) production. An ALP-linked colorimetric immunoassay is readily realized based on the above urease catalyzed multicolor generation system. Under optimal conditions, a limit of detection (LOD) of 1.73 ng mL−1 and a dynamic range from 0 to 18 ng mL−1 are achieved with rabbit IgG as a model analyte. A colored picture for each test is directly taken using a smartphone and then quantitatively analyzed with the free software ImageJ, eliminating the use of expensive and desktop equipment. The dose-dependent multicolor display is easier to distinguish with the naked eye for qualitative or semiquantitative detection over the traditional one-color system. The developed immunoassay scheme provides a promising platform for on-site testing or applications in resource-poor areas.
研究领域:
分析化学
·
生物传感
·
即时检测
·
移动健康
✓ 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）