The Experts below are selected from a list of 2268 Experts worldwide ranked by ideXlab platform
Panuwat Suppakul - One of the best experts on this subject based on the ideXlab platform.
-
formation of polydiacetylene silica nanocomposite as a Colorimetric Indicator effect of time and temperature
Advances in Polymer Technology, 2013Co-Authors: Atchareeya Nopwinyuwong, Waraporn Boonsupthip, Chiravoot Pechyen, Panuwat SuppakulAbstract:This work presents a method to prepare a new class of polydiacetylene (PDA)/SiO2 nanocomposites for Colorimetric Indicator applications. The silica concentration is 5 wt% of the diacetylene monomer, 10,12-pentacosadiynoic acid (PCDA). Under ultraviolet light irradiation, PCDA vesicle/silica nanocomposites were formed and an intense blue solution was obtained. The silica nanoparticles can improve chromic properties of molecules. The color transition of PDA/silica nanocomposites can change from blue (λmax∼ 640 nm) to red (λmax∼ 540 nm), which is irreversible when stored at different temperatures and time. This study investigated characterization of the aqueous suspension compared with pure PDA vesicles in the absorption spectra. Moreover, the color response was calculated. This is an efficient method for preparation of the Colorimetric sensor of nanocomposite materials after UV irradiation. The PDA/5 wt% silica nanocomposites aqueous matrix would potentially be developed as a new Colorimetric polymeric Indicator to study the effect of temperature and time. © 2012 Wiley Periodicals, Inc. Adv Polym Techn 32: E724–E731, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/adv.21315
-
Formation of Polydiacetylene/Silica Nanocomposite as a Colorimetric Indicator: Effect of Time and Temperature
Advances in Polymer Technology, 2012Co-Authors: Atchareeya Nopwinyuwong, Waraporn Boonsupthip, Chiravoot Pechyen, Panuwat SuppakulAbstract:This work presents a method to prepare a new class of polydiacetylene (PDA)/SiO2 nanocomposites for Colorimetric Indicator applications. The silica concentration is 5 wt% of the diacetylene monomer, 10,12-pentacosadiynoic acid (PCDA). Under ultraviolet light irradiation, PCDA vesicle/silica nanocomposites were formed and an intense blue solution was obtained. The silica nanoparticles can improve chromic properties of molecules. The color transition of PDA/silica nanocomposites can change from blue (λmax∼ 640 nm) to red (λmax∼ 540 nm), which is irreversible when stored at different temperatures and time. This study investigated characterization of the aqueous suspension compared with pure PDA vesicles in the absorption spectra. Moreover, the color response was calculated. This is an efficient method for preparation of the Colorimetric sensor of nanocomposite materials after UV irradiation. The PDA/5 wt% silica nanocomposites aqueous matrix would potentially be developed as a new Colorimetric polymeric Indicator to study the effect of temperature and time. © 2012 Wiley Periodicals, Inc. Adv Polym Techn 32: E724–E731, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/adv.21315
-
Development of a novel Colorimetric Indicator label for monitoring freshness of intermediate-moisture dessert spoilage
Talanta, 2010Co-Authors: Atchareeya Nopwinyuwong, Sudsai Trevanich, Panuwat SuppakulAbstract:A Colorimetric mixed pH dye-based Indicator with potential for the development of intelligent packaging, as a "chemical barcode" for real-time monitoring of intermediate-moisture dessert spoilage, is described. This on-package Indicator contains mixed pH-sensitive dyes, bromothymol blue and methyl red, that respond through visible color change to carbon dioxide (CO(2)) as a spoilage metabolite. Both Indicator solution and Indicator label characteristics were studied, as well as their response to CO(2). A kinetic approach was used to correlate the response of the Indicator label to the changes in intermediate-moisture dessert spoilage. Color changes, in terms of total color difference of a mixed pH dye-based Indicator, correlated well with CO(2) levels of intermediate-moisture dessert. Trials on golden drop have verified that the Indicator response correlates with microbial growth patterns in dessert samples, thus enabling the real-time monitoring of spoilage either at various constant temperatures or with temperature fluctuation.
Xinghai Liu - One of the best experts on this subject based on the ideXlab platform.
-
A novel Colorimetric Indicator based on agar incorporated with Arnebia euchroma root extracts for monitoring fish freshness
Food Hydrocolloids, 2019Co-Authors: Shaoyun Huang, Yabo Xiong, Yang Zou, Qingfeng Dong, Fuyuan Ding, Xinghai LiuAbstract:Abstract This work aimed to develop and characterize a novel Indicator film for monitoring fish freshness based on agar incorporated with natural dye extracted from Arnebia euchroma root (AEREs). The Fourier transform infrared spectroscopy results reflected that some new interactions have occurred between polymer matrix and natural dye. And the results of X-ray diffraction and scanning electron microscopy indicated that AEREs were well dispersed in the agar base film. A certain decrease was observed in water solubility, swelling ratio and elongation at break of Colorimetric film but tensile strength, Young's modulus, water vapor permeability and water contact angle of Colorimetric film were increased by addition of AEREs. The prepared Indicator films were used as freshness labels in an application trial, which was conducted to monitor the freshness of Wuchang bream (Megalobrama amblycephala) under refrigeration (4 °C) and at room temperature (25 °C). The total volatile basic nitrogen (TVB-N) and total viable count (TVC) of fish sample were determined periodically, and the color change of freshness labels was recorded simultaneously. The results showed that the Indicator film with lower content of AEREs demonstrated more conspicuous color change during fish spoilage. And the color response of freshness label was consistent with the spoilage threshold of TVC and TVB-N content in fish sample. Thus, these Colorimetric Indicator films could indicate the fish spoilage by visible color change. The developed Colorimetric Indicator film is expected to provide a convenient, non-destructive and visual method to estimate fish freshness during storage.
-
monitoring of oxygen using Colorimetric Indicator based on graphene tio2 composite with first order kinetics of methylene blue for modified atmosphere packaging
Packaging Technology and Science, 2018Co-Authors: Shuting Huang, Xinghai Liu, Yixiang Wang, Zhan Zhan, Ling Jia, Lingyun ChenAbstract:Oxygen is crucial in food preservation and food spoilage. For the purpose of monitoring intact of modified atmosphere packaging (MAP) by nondestructive testing and controlling the reaction rate during recovery stage, we report a convenient and visual Colorimetric oxygen Indicator based on a graphene /titanium oxide composite, incorporating glycerol, methylene blue (MB), hydroxyethyl cellulose (HEC) and poly (vinyl alcohol) (PVA). The graphene/titanium oxide (GNT) composite was synthesized through a modified Hummers synthesis of graphene oxide, followed by the hydro-thermal treatment with butyl titanate without using any reducing agent, then the morphology and structure characteristics were analyzed by XRD, FT-IR, Raman spectra, UV-vis, SEM and TEM. According to the performance tests using UV-vis and CIElab, the Indicator demonstrated the pseudo first-order kinetics of MB for modified atmosphere packaging in detecting stage. It is confirmed with the results that the prepared Colorimetric Indicator can actually detect the intact of MAP without destruction. Additionally, the reaction time of Indicator in recovery stage can be controlled by changing the concentration of MB, because of pseudo first-order kinetics.
-
Monitoring of oxygen using Colorimetric Indicator based on graphene/TiO2 composite with first‐order kinetics of methylene blue for modified atmosphere packaging
Packaging Technology and Science, 2018Co-Authors: Shuting Huang, Xinghai Liu, Yixiang Wang, Zhan Zhan, Ling Jia, Lingyun ChenAbstract:Oxygen is crucial in food preservation and food spoilage. For the purpose of monitoring intact of modified atmosphere packaging (MAP) by nondestructive testing and controlling the reaction rate during recovery stage, we report a convenient and visual Colorimetric oxygen Indicator based on a graphene /titanium oxide composite, incorporating glycerol, methylene blue (MB), hydroxyethyl cellulose (HEC) and poly (vinyl alcohol) (PVA). The graphene/titanium oxide (GNT) composite was synthesized through a modified Hummers synthesis of graphene oxide, followed by the hydro-thermal treatment with butyl titanate without using any reducing agent, then the morphology and structure characteristics were analyzed by XRD, FT-IR, Raman spectra, UV-vis, SEM and TEM. According to the performance tests using UV-vis and CIElab, the Indicator demonstrated the pseudo first-order kinetics of MB for modified atmosphere packaging in detecting stage. It is confirmed with the results that the prepared Colorimetric Indicator can actually detect the intact of MAP without destruction. Additionally, the reaction time of Indicator in recovery stage can be controlled by changing the concentration of MB, because of pseudo first-order kinetics.
-
Intelligent Film Based on Agar and Natural Dye from Arnebia Euchroma Root Extracts as a Visual Colorimetric Indicator
The 21st IAPRI World Conference on Packaging, 2018Co-Authors: Shaoyun Huang, Yabo Xiong, Zhang Lingxuan, Xinghai LiuAbstract:Natural dyes extracted from Arnebia euchroma root were immobilized in agar to prepare a Colorimetric pH sensing film, which showed an obvious color change from red to blue in the pH range 3.0-12.0. The UV-vis spectra of natural dye in solution and in the sensing film were studied. FT-IR and UV-vis spectra of the Colorimetric films showed that Arnebia euchroma root extracts (AEREs) were successfully immobilized into agar matrix. Mechanical properties (ultimate tensile strength, elongation to break, and Young’s modulus) of pH Indicator films with and without AEREs were contrasted. Color response of this pH sensing film to NH3 standard solution was also researched respectively and results showed that the Colorimetric films with lower content of AEREs were more sensitive towards volatile ammonia. The Colorimetric Indicator film is expected to provide a convenient, non-destructive and visual method to help the estimation of fish spoilage during storage.
Dmitry M Rudkevich - One of the best experts on this subject based on the ideXlab platform.
-
revisiting noncovalent so2 amine chemistry an Indicator displacement assay for Colorimetric detection of so2
Journal of the American Chemical Society, 2005Co-Authors: Alexander V Leontiev, Dmitry M RudkevichAbstract:A supramolecular approach for potential detection of SO2 is presented, which is based on the “old” donor−acceptor chemistry between SO2 and amines and includes an Indicator−displacement assay. When amines were added to Zn−tetraphenylporphyrin 1 in CHCl3, the solution changed from red to dark green. A bathochromic shift of Δλ ∼ 10 nm was observed for the Soret band, indicating the formation of 1•amine complexes. After this, SO2 gas was introduced, and the original red color of the solution was restored. The Soret band returned to its position for free porphyrin 1. The 1•amine complexes dissociated, and new SO2•amine adducts formed. Porphyrin 1 thus served as an indirect Colorimetric Indicator for SO2. The system discriminates between SO2 and such typical exhaust gases as COX, NOX, and H2O. From the Indicator−displacement assay, the Kassoc values between 1000 and 30 000 M-1 for SO2•amine complexes were determined, which are comparable to those obtained by direct titration experiments between SO2 and the ami...
Loong-tak Lim - One of the best experts on this subject based on the ideXlab platform.
-
An inkjet‐printed sulfonephthalein dye Indicator array for volatile amine detection
Journal of food science, 2020Co-Authors: Xiaoyu Luo, Loong-tak LimAbstract:Colorimetric Indicators are versatile for applications such as intelligent food packaging, for reflecting the actual quality and/or monitoring distribution history of food products. In this study, a Colorimetric Indicator array composed of sulfonephthalein dyes was successfully developed by piezoelectric inkjet printing, for the detection of volatile amines-the primary spoilage gases for fish and seafood products. The printing inks were formulated in water/ethanol/1-butanol mixture. By refilling the printer's cartridges with our formulated inks and controlling the red, green, and blue color parameters, a 7 × 9 Indicator array was printed onto inkjet transparency films. The color response of the Indicator array was tested with different volatile amines at various concentrations. The array Indicator was capable of discriminating six different volatile amines: ammonia, trimethylamine, dimethylamine, triethylamine, piperidine, and hydrazine. The printability of the inks was investigated by characterizing their density, surface tension, and dynamic viscosity, dictating that all formulated inks were printable fluid. The microstructural morphologies of the printed dyes on transparency films were evaluated using scanning electron microscopy. Interactions of the dye with the volatiles were studied by Fourier transform infrared spectroscopy. In summary, the piezoelectric inkjet printing method presented in this study offers a convenient, efficient, and flexible means to fabricate Colorimetric Indicators for detecting food spoilage volatiles. These Indicators are promising as sensing components in intelligent packaging systems, to reveal the freshness of fish products by correlating with quality parameters such as total volatile basic nitrogen, microbial growth, and sensory attributes. Further studies on the feasibility of using the array Indicators in real food packaging systems, development of strategy to mitigate the potential migration of the Indicator dyes, and designing array patterns optimal for machine/human interpretation, are important to commercialize the technology. PRACTICAL APPLICATION: Piezoelectric inkjet printing offers a convenient way to fabricate sensing materials and aligns with industrial packaging operations. The use of Indicators on food package helps consumers more accurately perceive real-time food quality information.
-
Curcumin-loaded electrospun nonwoven as a Colorimetric Indicator for volatile amines
LWT, 2020Co-Authors: Xiaoyu Luo, Loong-tak LimAbstract:Abstract Colorimetric Indicators are useful in intelligent food packaging applications. As a natural food colorant, curcumin is a promising Colorimetric Indicator for the detection of alkaline compounds produced during food spoilage. In this study, curcumin-loaded electrospun nonwovens were developed for the detection of amines, which are principal spoilage volatiles of fish and aquatic products. The spin dope solution for electrospinning was prepared by dispersing curcumin (0.32% w/w) in 14% (w/w) polyvinylpyrrolidone (PVP) or 9% (w/w) ethylcellulose (EC)/0.2% (w/w) poly(ethylene oxide) (PEO) solution in anhydrous ethanol. Curcumin-loaded nonwovens were obtained by free surface electrospinning and subsequently characterized for amine detection. When exposed to amine volatiles, the nonwoven Indicators exhibited striking yellow-to-orange/red color transition, along with a reduction in curcumin's fluorescence intensity. Both EC/PEO- and PVP-based nonwovens were capable of discriminating six different volatile amines (trimethylamine, ammonia, dimethylamine, triethylamine, piperidine and hydrazine) at 0.2 mmol level. Comparing the two nonwoven carriers, EC/PEO resulted in smaller fiber diameter (1.06 μm) and higher curcumin loading efficiency (91%) than those derived from PVP (83% loading efficiency and 1.52 μm diameter). The limit of detection (LOD) and limit of quantitation (LOQ) of using EC/PEO-based fiber for amine detection were lower than PVP-based fiber, except for TMA.
Atchareeya Nopwinyuwong - One of the best experts on this subject based on the ideXlab platform.
-
formation of polydiacetylene silica nanocomposite as a Colorimetric Indicator effect of time and temperature
Advances in Polymer Technology, 2013Co-Authors: Atchareeya Nopwinyuwong, Waraporn Boonsupthip, Chiravoot Pechyen, Panuwat SuppakulAbstract:This work presents a method to prepare a new class of polydiacetylene (PDA)/SiO2 nanocomposites for Colorimetric Indicator applications. The silica concentration is 5 wt% of the diacetylene monomer, 10,12-pentacosadiynoic acid (PCDA). Under ultraviolet light irradiation, PCDA vesicle/silica nanocomposites were formed and an intense blue solution was obtained. The silica nanoparticles can improve chromic properties of molecules. The color transition of PDA/silica nanocomposites can change from blue (λmax∼ 640 nm) to red (λmax∼ 540 nm), which is irreversible when stored at different temperatures and time. This study investigated characterization of the aqueous suspension compared with pure PDA vesicles in the absorption spectra. Moreover, the color response was calculated. This is an efficient method for preparation of the Colorimetric sensor of nanocomposite materials after UV irradiation. The PDA/5 wt% silica nanocomposites aqueous matrix would potentially be developed as a new Colorimetric polymeric Indicator to study the effect of temperature and time. © 2012 Wiley Periodicals, Inc. Adv Polym Techn 32: E724–E731, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/adv.21315
-
Formation of Polydiacetylene/Silica Nanocomposite as a Colorimetric Indicator: Effect of Time and Temperature
Advances in Polymer Technology, 2012Co-Authors: Atchareeya Nopwinyuwong, Waraporn Boonsupthip, Chiravoot Pechyen, Panuwat SuppakulAbstract:This work presents a method to prepare a new class of polydiacetylene (PDA)/SiO2 nanocomposites for Colorimetric Indicator applications. The silica concentration is 5 wt% of the diacetylene monomer, 10,12-pentacosadiynoic acid (PCDA). Under ultraviolet light irradiation, PCDA vesicle/silica nanocomposites were formed and an intense blue solution was obtained. The silica nanoparticles can improve chromic properties of molecules. The color transition of PDA/silica nanocomposites can change from blue (λmax∼ 640 nm) to red (λmax∼ 540 nm), which is irreversible when stored at different temperatures and time. This study investigated characterization of the aqueous suspension compared with pure PDA vesicles in the absorption spectra. Moreover, the color response was calculated. This is an efficient method for preparation of the Colorimetric sensor of nanocomposite materials after UV irradiation. The PDA/5 wt% silica nanocomposites aqueous matrix would potentially be developed as a new Colorimetric polymeric Indicator to study the effect of temperature and time. © 2012 Wiley Periodicals, Inc. Adv Polym Techn 32: E724–E731, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/adv.21315
-
Development of a novel Colorimetric Indicator label for monitoring freshness of intermediate-moisture dessert spoilage
Talanta, 2010Co-Authors: Atchareeya Nopwinyuwong, Sudsai Trevanich, Panuwat SuppakulAbstract:A Colorimetric mixed pH dye-based Indicator with potential for the development of intelligent packaging, as a "chemical barcode" for real-time monitoring of intermediate-moisture dessert spoilage, is described. This on-package Indicator contains mixed pH-sensitive dyes, bromothymol blue and methyl red, that respond through visible color change to carbon dioxide (CO(2)) as a spoilage metabolite. Both Indicator solution and Indicator label characteristics were studied, as well as their response to CO(2). A kinetic approach was used to correlate the response of the Indicator label to the changes in intermediate-moisture dessert spoilage. Color changes, in terms of total color difference of a mixed pH dye-based Indicator, correlated well with CO(2) levels of intermediate-moisture dessert. Trials on golden drop have verified that the Indicator response correlates with microbial growth patterns in dessert samples, thus enabling the real-time monitoring of spoilage either at various constant temperatures or with temperature fluctuation.