Tag: M.W=400-450

Gundogdu, Nilufer published the artcileKinetic study for adsorption of α-naphtholphthalein onto silica gel surface-imprinted polymer and non-imprinted polymer, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Journal of Macromolecular Science, Part A: Pure and Applied Chemistry (2016), 53(12), 734-740, database is CAplus.

In this study, the mol. imprinting polymer (MIP) was prepared using α-naphtholphthalein as a template, 2-(diethylamino)ethyl acrylate as a functional monomer and ethylene glycol dimethacrylate as a crosslinking agent by aid of free radical polymerization onto surfaces of vinyltrimethoxysilane modified silica gel. The MIP was extracted with acetonitrile for overnight to remove the template mol. from the MIP. Non-imprinted polymer (NIMP) was synthesized using the same materials except α-naphtholphthalein as template mol. α-Naphtholphthalein adsorption on surfaces of the both polymer was studied at three different temperatures (19°C, 25°C and 35°C). It was observed that the adsorption capacity increased with increasing temperature and with time. The time required to reach the equilibrium for two polymers and all temperature was accepted to be nearly 6 h. The saturated adsorption amounts at the equilibrium were found as 120 mg/g, 123 mg/g and 127 mg/g at 19°C, 25°C and 35°C, resp. for MIP and 78 mg/g, 98 mg/g and 120 mg/g at 19°C, 25°C and 35°C, resp. for NIMP. The mechanism of adsorption of α-naphtholphthalein onto MIP and NIMP is nearly appropriate to pseudo-first-order kinetic model with an activation energy of 11.63 kJ/mol for MIP and 23.69 kJ/mol for NIMP. Thermodn. parameters of activated complex in the adsorption process showed that the adsorption was carried out with an endothermic activation enthalpy, large neg. entropy changes and the pos. values of ΔG* that the adsorption processes is not favorable.

Journal of Macromolecular Science, Part A: Pure and Applied Chemistry published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Carvajal, M. A. published the artcileHand-held optical instrument for CO₂ in gas phase based on sensing film coating optoelectronic elements, Quality Control of 596-01-0, the publication is Sensors and Actuators, B: Chemical (2010), 144(1), 232-238, database is CAplus.

Different strategies were tested to include a CO₂ optical gas sensor in a low-cost portable electronic instrument. Plastic solid-state sensor membranes are based on the quenching of a phosphorescent dye by the deprotonated form of a nonluminescent pH indicator. As a result of this study, the configuration with both optoelectronic components coated with sensing chem. (LED with the luminophore and photodetector with the pH-active dye) presents a better CO₂ response in terms of sensitivity and reproducibility than the other configurations studied by the authors. The portable measurement system resulting from the integration of coated LED with the luminophore and photodetector with the pH indicator was characterized in terms of calibration, sensitivity, short and long-term stability, transient response and thermal dependence with results comparable to laboratory instrumentation and other sensing films described in literature. The sensor calibration curve was modeled according to a theor. model, reported in the literature, with two coefficients, which was included in the microcontroller of the measurement system to provide a direct reading of the gas concentration in the display. The sensor’s full range is 0-100% CO₂ concentration The study of the response time of the membranes was made, obtaining response t₉₀ and recovery t₁₀ times of 31 and 117 s, resp. Temperature dependence was successfully fitted to an Arrhenius type function that was included in the microcontroller of the instrument, to calculate and display the CO₂ concentration, correcting the temperature dependence. The characterization demonstrated the reliability and good performance of this type of solution aimed at integrating chem. sensors in electronic and optoelectronic devices. The localization of the sensing film on the detector and on the light source makes any addnl. optical element unnecessary, thus reducing system costs, avoiding alignment problems, optimizing the efficiency of the signal collection and making it possible to replace the sensor easily.

Sensors and Actuators, B: Chemical published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Quality Control of 596-01-0.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Escobedo, P. published the artcileFlexible Passive near Field Communication Tag for Multigas Sensing, Product Details of C28H18O4, the publication is Analytical Chemistry (Washington, DC, United States) (2017), 89(3), 1697-1703, database is CAplus and MEDLINE.

In this work we present a full-passive flexible multigas sensing tag for the determination of oxygen, carbon dioxide, ammonia, and relative humidity readable by a smart-phone. This tag is based on near field communication (NFC) technol. for energy harvesting and data transmission to a smart-phone. The gas sensors show an optic response that is read through high-resolution digital color detectors. A white LED is used as the common optical excitation source for all the sensors. Only a reduced electronics with very low power consumption is required for the reading of the optical responses and data transmission to a remote user. An application for the Android operating system has been developed for the power supplying and data reception from the tag. The responses of the sensors have been calibrated and fitted to simple functions, allowing a fast prediction of the gases concentration Cross-sensitivity has also been evaluated, finding that in most of the cases it is negligible or easily correctable using the rest of the readings. The election of the target gases has been due to their importance in the monitoring of modified atm. packaging. The resolutions and limits of detection measured are suitable for such kinds of applications.

Analytical Chemistry (Washington, DC, United States) published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Product Details of C28H18O4.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Perez de Vargas-Sansalvador, Isabel M. published the artcileWater based-ionic liquid carbon dioxide sensor for applications in the food industry, Synthetic Route of 596-01-0, the publication is Sensors and Actuators, B: Chemical (2017), 302-309, database is CAplus.

A new water-based sensor for carbon dioxide containing an ionic liquid is presented. The sensor is based on the acidity of the CO₂ mol. The sensor incorporates an ionic liquid in the matrix, which enhances CO₂ solubility, and minimising the response and recovery times of the sensor. The entire concentration range (0-100%) of CO₂ in water has been studied. The sensor is more sensitive at low CO₂ concentrations as is usual in this kind of optical sensor. As the sensor is intended for smart food packaging, one of the most important characteristics is stability, and this has been studied under different conditions of light, temperature and relative humidity. The sensor was found to be stablef or more than 14 days, which is the period of use for the intended application. Pork chops were packed at 4 °C and the production of CO₂ studied in conjunction with total bacterial counts over a period of 14 days. The results show that the concentration of CO₂ dioxide increases in time, in correlation with bacterial counts. As the threshold of CO₂ content for human consumption of this meat is 20%, the sensor has been optimized for detection around this concentration

Sensors and Actuators, B: Chemical published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Synthetic Route of 596-01-0.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Perez de Vargas-Sansalvador, I. M. published the artcileA new light emitting diode-light emitting diode portable carbon dioxide gas sensor based on an interchangeable membrane system for industrial applications, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Analytica Chimica Acta (2011), 699(2), 216-222, database is CAplus and MEDLINE.

A CO₂ measurement system (0-100%) based on a paired emitter-detector diode arrangement as a colorimetric detector is described. Two different configurations were tested. Configuration 1 (opposite side configuration), where a secondary inner filter effect accounted for CO₂ sensitivity, involved absorption of phosphorescence emitted from a CO₂-insensitive luminophore by an acid-base indicator. Configuration 2, where the luminophore-containing membrane was removed, simplified the sensing membrane which now only contained the acid-base indicator. Also, 2 different instrumental configurations were assessed, using a paired emitter/detector diode system consisting of 2 light-emitting diodes (LED) where one diode was used as the light source (emitter) and the other diode was used in reverse bias mode as the light detector. The first configuration used a green LED as emitter and a red LED as detector; the second configuration used 2 identical red LED as emitter and detector. The system was characterized for sensitivity, dynamic response, reproducibility, stability, and temperature influence. Results showed configuration 2 had a better CO₂ response in terms of sensitivity.

Analytica Chimica Acta published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Appler, B. published the artcileDetection of β,β’-dichloroethyl sulfide on thin-layer chromatograms, Safety of 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Journal of Chromatography (1983), 264(3), 445-52, database is CAplus.

TLC was employed to detect and quantify very low concentrations of β,β’-dichloroethyl sulfide (sulfur mustard, HD) [505-60-2], on the basis of visualization of spots and R_f values. Various reagents and reactions were examined with respect to their sensitivity and selectivity. In particular, chem. similar compounds like thiodiglycol or β,β’-dichloroethyl oxide as well as a variety of organophosphorus esters (pesticides) and halogen-containing organic compounds were subjected to the same anal. procedures so as to check the selectivity of the TLC methods developed for HD. The best separations were obtained by developing silica chromatophores in CH₂Cl₂–n-hexane (1:1) solvent. The most satisfactory evidence for the presence of HD is based on a reaction with iodoplatinate [PtI₆]^2- and the subsequent application of starch solution (ultimate sensitivity 0.1 μg/μL). Somewhat less sensitive (0.5 and 1 μg, resp.), but quite selective, is a reaction utilizing Michler’s ketone in the presence of HgBr₂, which gives intense purple spots on a yellow background, and a photochem. reaction using AgNO₃. Other sensitive and selective reactions are those with triphenylmethane dyes in conjunction with AgNO₃ and with SeO₂.

Journal of Chromatography published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Safety of 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Perez de Vargas-Sansalvador, I. M. published the artcilePhosphorescent sensing of carbon dioxide based on secondary inner-filter quenching, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Analytica Chimica Acta (2009), 655(1-2), 66-74, database is CAplus and MEDLINE.

A study of different strategies to prepare phosphorescence-based sensors for gaseous CO₂ determination was performed. It includes the characterization of different configurations tested, a discussion of the results obtained and possibilities for the future. The optical sensor for gaseous CO₂ is based on changes in the phosphorescence intensity of the platinum octaethylporphyrin (PtOEP) complex trapped both on oxygen-insensitive poly(vinylidene chloride-co-vinyl chloride) (PVCD) membranes and PVCD microparticles, due to the displacement of the α-naphtholphthalein acid-base equilibrium with CO₂ concentration A secondary inner-filter mechanism was tested for the sensor and a full range linearized calibration was obtained by plotting (I₁₀₀-I₀)/(I-I ₀) vs. the inverse of the CO₂ concentration, where I₀ and I₁₀₀ are the detected luminescence intensities from a membrane exposed to 100% nitrogen and 100% CO₂, resp., and I at a defined CO₂ concentration The different configurations tested included the use of membranes containing luminophore and pH-sensitive dye placed on two opposite sides of a transparent support to prevent the observed degradation of the PtOEP complex in the presence of the tetraoctylammonium hydroxide (TOAOH) phase transfer agent, which produced better results regarding stability and sensitivity. The CO₂ gas sensor based on PtOEP homogeneous membranes presented better properties in terms of response time and sensitivity than that based on PtOEP microparticles. With a detection limit of 0.02%, the response time (10-90% maximum signal) is 9 s and the recovery time (90-10%) is 115 s. The lifetime of the membranes for CO₂ sensing preserved in a 94% RH atm. and dark conditions is longer than at least 4 mo.

Analytica Chimica Acta published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Aguayo-Lopez, M. L. published the artcileOptical sensor for carbon dioxide gas determination, characterization and improvements, Quality Control of 596-01-0, the publication is Talanta (2014), 196-201, database is CAplus and MEDLINE.

A study of different alternatives to improve the stability and lifetime of sensors for the determination of gaseous CO₂ was performed. It includes the characterization of different sensing membranes, a discussion of the results obtained and possibilities for the future. The solid sensor membrane for gaseous CO₂ based on changes in the luminescence of a luminophore immobilized on O₂-insensitive film, concurrent with the displacement of a pH indicator, has some drawbacks, such as the loss of efficiency over time and the need to maintain the sensor in special atm. conditions. As a solution to these drawbacks, two alternatives were tested, the 1st alternative was replacing the newly proposed tetraoctyl ammonium hydroxide (TOAOH ) phase transfer agent with other basic agents that did not undergo a Hoffman degradation reaction, and the 2nd alternative was the use of hydrophilic polymers that could retain water needed for CO₂ sensing more efficiently. The different membranes tested indicated that the use of tetra-Me ammonium (TMAOH) instead of TOAOH as the phase transfer agent produced better results regarding stability and sensitivity. Replacing the membrane polymer with hydrophilic polymers improved the sensing characteristics in terms of response time and stability over hydrophobic polymers. With a detection limit of 0.006%, the response time is 19 s and the recovery time is 100 s. The lifetime of the sensing membranes, which do not need to be held in any special atm. other than darkness, is longer than at least 300 days for membranes with TMAOH in hydrophilic polymer and 515 days for membranes with TMAOH in Et cellulose.

Talanta published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Quality Control of 596-01-0.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

Fernandez-Sanchez, J. F. published the artcileOptical CO₂-sensing layers for clinical application based on pH-sensitive indicators incorporated into nanoscopic metal-oxide supports, Synthetic Route of 596-01-0, the publication is Sensors and Actuators, B: Chemical (2007), 128(1), 145-153, database is CAplus.

We describe CO₂-selective films designed for clin. application based on the co-incorporation of different phenol dyes, α-naphtholphthalein (NAF), naphthol blue black (NBB) and Calmagite (CMG), with a phase-transfer agent, tetraoctylammonium hydroxide (TONOH), into metal-oxide nanoporous matrixes. The metal-oxide coatings consist of aluminum (AlOOH), silicon (SiO₂) and zirconium (ZrO₂) oxides. The chem. reaction principle and preparation of these new sensing layers are described in detail. We have investigated the effect of the type and concentration of the pH-indicator and TONOH together with that of the composition and morphol. characteristics of the nanostructured material. The influence of external parameters such as flow-rate, humidity and interfering gases (NO, CO, NO₂ and SO₂) were also looked into. The sensing films responded to CO₂ concentrations in the gas phase between 0.25% and 40% CO₂ (volume/volume) for NAF-TONOH, 4.1% and 30% CO₂ for NBB-TONOH and 0.6% and 40% CO₂ for CMG-TONOH, with detection limits of 0.25%, 4.1% and 0.6% CO₂ (volume/volume) for NAF-TONOH, NBB-TONOH and CMG-TONOH, resp. The nanoporous membranes provided higher dispersion and accessibility of the dye, and thus a quick response time, lower probability of aggregation, the possibility of sterilization by gamma radiation, insulation from reactive chems. and higher ambient stability.

Sensors and Actuators, B: Chemical published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Synthetic Route of 596-01-0.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem

He, Xingcun published the artcileFlow injection analysis of platinum metals. VI. Iridium(IV)-potassium periodate-α-naphtholphthalein system, SDS of cas: 596-01-0, the publication is Fenxi Huaxue (1990), 18(3), 237-9, database is CAplus.

A flow-injection spectrophotometric method for determination of trace Ir(IV) was developed based on the catalytic effect of Ir(IV) on the oxidation of α-naphtholphthalein with KIO₄. The detection limit is 0.020 μg Ir/mL and the anal. rate is 61 sample/h. The method is simple, fast, and sensitive.

Fenxi Huaxue published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, SDS of cas: 596-01-0.

Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem