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
SENSORS
·
2018
·Vol. 18
·期 10
·3195
·
IF 2.475
Jianxin Zhang,Lei Zhou
Making use of the sol-gel technique, an optical pH sensor was prepared, which was made from an organic carrier with four indictors including congo red, bromophenol blue, cresol red, and chlorophenol red, cross-linked by tetraethyl orthosilicate (TEOS) and cellulose acetate. The actual detection range of the optical pH sensor is 2.5–11.0. The optimal ratio of ethyl orthosilicate, absolute ethanol, deionized water, and hydrochloric acid in glue precursor of the sensor-sensitive membrane was explored. The orthogonal experiment was designed to optimize the dosage of cellulose acetate,N,N-dimethylformamide (DMF), indicator, hydrochloric acid, and precursor glue in preparing the sensor-sensitive membrane. The linearity, measurement accuracy, repeatability, stability, and response time of the prepared pH sensor were tested. The measurement results were analyzed using a support vector machine and linear regression. The experimental results show that the optical pH sensor has a measurement accuracy of up to 0.2 pH and better stability and repeatability than the traditional pH glass electrode.Keywords:sol-gel technique;optical pH sensor;indicator;sensor-sensitive membrane
研究领域:
材料科学
·
化学传感器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Huanhuan Wang,Xuefeng Zhu,Hongbo Xu,Qunhui Yuan
Herein, an assembly of a new synthesized lariat ether ( Pc ) was demonstrated as a novel fluorescent indicator for the determination of silver ions in aqueous solution. The silver-specific receptor Pc was constructed by incorporating an azacrown[N,S,O] moiety into a picoline fluorophore. The UV–vis spectra revealed that the self-assembly of the stacked Pc molecules is initially in a form of J- aggreate ( Pc J-agg ), whereas it gradually converts to a form of H -aggregate ( Pc H-agg ), driven by the π-π stacking and hydrophobic effects. Under ultrasonic oscillation, the transformation of the aggregated forms from Pc J-agg to Pc H-agg would be disturbed while a formation of a new stable assembled form of Pc molecules denoted as Pc NS was initiated. The morphology and nanosheeted structure of the new Pc NS were revealed by atomic force microscopy and dynamic light-scattering measurement. As for the investigation of its emission property, the fluorescence spectroscopy was used and an evidently blue-shifted fluorescence was observed. When used as a stimuli-responsive fluorescent indicator, the Pc NS assembly was degraded upon the addition of silver ions, accompanying a 44 nm bathochromic shift in its fluorescence emission spectrum. Investigation of its selectivity for various cations confirmed that the Pc NS nanosheet assembly could be efficiently used for the detection of silver ions.
研究领域:
化学
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Mingyan Jia,Yixuan Pan,Jianbo Zhou,Mei Zhang
In this work, we developed an optical colorimetric sensor array for the discrimination of Chinese teas. The sensor array was carefully designed based on tea polyphenol induced indicators displacement assay (IDA), using phenylboronic acids with different substituents as the receptors to polyphenols. The accurate identification for polyphenols with different species or concentrations proved the potential of the sensor array. The sensor array successfully distinguished tea samples within different categories, grades and origins, coupling with PLS-DA. This work offered an efficient and rapid method to distinguish teas and tea-related products. Besides, the assay is supposed to be suitable for the identification of other polyphenol-related natural products.
研究领域:
食品科学
·
分析化学
✓ 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
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
ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Xianfeng Wang,Chengxiang Chu,Jiayi Lv,Yuanyuan Jia,Libo Lin,Mei Yang,Suyi Zhang,Danqun Huo,Changjun Hou
High-performance analysis of heavy metal ions is great importance in both environment and food safety. In this work, a facile and reliable colorimetric sensor was presented for simultaneous detection of Cu 2+ and Cr 3+ based on indicator-displacement assay (IDA). As a typical silicate nanomaterials , ZnSiO 3 hollow nanosphere (ZSHS) exhibited an outstanding ion exchange capacity. Zincon was incorporated with the ZSHS to form a zincon/ZSHS hybrid ionophore with a blue color. Upon the addition of Cr 3+ , IDA reaction and selective ion exchange occurred with the color change of zincon/ZSHS ionophore from blue to yellow. With such a design, colorimetric measurement of Cr 3+ was realized. The linear concentration for Cr 3+ detection ranged from 0.5 μM to 75 μM with the LOD of 83.2 nM. Furthermore, we also screened different kinds of complexing agents that may respond with zincon/ZSHS ionophore and various metal ions. It was found that tartaric acid (TA) showed the chelation capability of Zn 2+ -TA is stronger than that of Zn 2+ -zincon. Thus zincon/ZSHS/TA presented a yellow color due to the chelation reaction of Zn 2+ -TA, releasing the zincon as a free state. After addition of Cu 2+ , a stronger chelation reaction of Cu 2+ -zincon occurred. This process involved in the color change from yellow to blue and realized colorimetric measurement of Cu 2+ . The detection limit of Cu 2+ was calculated to be 43.7 nM with linear range from 0.1 to 20 μM. In addition, the zincon/ZSHS nanoprobe was successfully applied for simultaneous measurement of Cu 2+ and Cr 3+ in sorghum and river water, indicating that the zincon/ZSHS nanoprobe provided a promising sensing platform in environment and food safety.
研究领域:
环境科学
·
食品安全
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Xinru Wen,Yixiang Zhen,Ruizhi Yang,Huimin Gao,Nasra Seif Juma,Liang Bai,Yan Chen,Yadong Zhao
In this study, an ultra-light porous aerogel was synthesized utilizing Blueberry anthocyanin (BA) and cellulose nanofibrils (CNF), and the freshness of shrimp was assessed through the colorimetric response of the aerogel. Through modification by Vinyltrimethoxysilane (VTMO), the aerogel's surface properties were altered from hydrophilic to hydrophobic, thereby enhancing its practicality in wet environments. By adjusting the concentrations and ratios of BA and CNF, key physical characteristics such as density, porosity, and specific surface area of the aerogel can be precisely controlled. These properties influence the aerogel's capacity to adsorb gases, thereby affecting its color change reversibility, sensitivity, and stability. Among all aerogels with varying proportions of BA/CNF (1:2, 1:3 and 1:4), the one prepared with a ratio of 1:3 (BA/CNF 1:3 aerogel) exhibited a high porosity and specific surface area, demonstrating exceptional sensitivity to alkaline gases and remarkable stability under light conditions. The detection limits of total volatile basic nitrogen (TVB-N) in BA/CNF 1:3 aerogel for detecting shrimp meat spoilage were 20.02 mg/100 g at 4 °C and 29.87 mg/100 g at 25 °C respectively. This kind of composite aerogel could be used for sensitive and visual monitoring of shrimp freshness, thereby reducing food waste and offering a novel approach to intelligent development within the food packaging industry.
研究领域:
食品科学
·
材料科学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
Analytical Methods
·
2024
·Vol. 16
·期 5
·780-785
·
IF 2.7
Simin Hong,Mingming Yan,Yuan Feng,Huifang Chen,Ben Xu,Chunliu Zhao,Juan Kang
Ethanol plays a critical role in the modern chemical industry, food production, and medical research. Given its wide applications, the detection of ethanol concentration is very necessary. In this paper, a fibre device for rapid ethanol detection is proposed. The sensing head was fabricated with multimode fibre. The hydrogel was photo-cured on the fibre tip from polyethylene glycol diacrylate (PEGDA). In the hydrogel, rhodamine 6G (R6G) was immobilized as the fluorescent indicator. The sensor was designed based on the swelling behaviour of the hydrogel in liquid. The transparency of the hydrogel was modulated by the component of the water–ethanol mixture, thus, the fluorescence intensity of R6G was monitored for the determination of ethanol. Within the range of 0–62.2 vol%, the detection limit (LOD) was 0.4 vol%. A detailed comparison with other detection methods showed that the proposed sensor has the advantages of being single-ended, low LOD, cost-effective, and easy to prepare. It has great potential for on-site ethanol detection applications.
研究领域:
化学传感器
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE CHEMICAL LETTERS
·
2013
·
IF 1.21
Jian Li,Ya-Qin Sun,Yin-Mao Wei,Jian-Bin Zheng
A novel electrochemical approach for detection of saccharides via indicator displacement assay was presented. In this system, 2-fluorophenylboronic acid and dopamine (DA) were performed as probe set. The electrochemical properties of DA and the binding to 2-fluorophenylboronic acid in phosphate buffer at different pH values were investigated by cyclic voltammetry. After addition of fructose to the solution, a competition for the binding 2-fluorophenylboronic acid occurred that led to the release of the DA. The regenerate oxidation current of DA increased with increasing fructose concentration. Under optimized experimental conditions, the peak current was linearly related to fructose concentration in the range of 0.3–5.0 mmol/L with a detection limit of 0.1 mmol/L. In addition, the interaction between 2-fluorophenylboronic acid and other cis -diol compounds such as glucose, galactose and mannose was investigated.
研究领域:
分析化学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Future Foods
·
2023
·
IF 0
Yanan Liu,Huan Li,Jian Chen,Jiesi Feng,Renjie Lian,Linglin Fu,Yanbo Wang
ABSTRACT Indicating hydrogels have shown the advantages of being fast, sensitive, and real-time in demonstrating the freshness of aquatic products due to their noticeable color change. In this work, an anti-freezing hydrogel embedded with pH-sensitive alizarin was developed as an original colorimetric indicator for monitoring the corruption of aquatic products at low temperatures. The anti-freezing hydrogel was prepared from 2-carboxyethyl acrylate, [2-(methacryloyloxy)ethyl]-trimethylammonium chloride, and 2-hydroxyethyl methacrylate monomers with triethylene glycol dimethacrylate as cross-linking agent. The hydrogel showed excellent anti-freezing capability, which was further incorporated with the pH-sensitive dye alizarin to gain the indicating capability. When applied in the indication of the freshness of salmon under low-temperature storage, it was found that the color changes of the indicator corresponded with the total volatile basic nitrogen contents of salmon, the correlation coefficient of which was 0.959 6. These results indicated the application potential of the hydrogels as freshness indicators during low-temperature storage or cold-chain transportation.
研究领域:
材料科学
·
食品科学
·
化学工程
✓ 已验证
DOI
危险品化学品经营许可证（带存储）