Month: December 2022

Kolthoff, I. M. published the artcileThe color changes of sulfonephthaleins, benzeins and phthaleins, Formula: C28H18O4, the publication is Journal of Physical Chemistry (1931), 1433-47, database is CAplus.

In an aqueous solution of phenolphthalein the concentration of the lactone form is of the order of 10,000 times greater than that of the carboxylic acid configuration. The equilibrium between the quinone and the quinone phenolate (anion) forms of the sulfonephthaleins in their alk. range quantitatively governs the color change. Benzeins which are not too little soluble in water have advantages over the corresponding sulfonephthaleins as indicators. α-Naphtholphthalein in aqueous solution is mainly present in the quinoid form. The color change of sulfonephthaleins, benzeins and phthaleins in acid medium is to be attributed to the weakly basic character of the quinone group. Thymol blue forms a hybrid ion in its color change in the acid range. By using the Fajans method of adsorbing cations on negatively charged AgCNS (with excess of CNS ions) or on positively charged AgCNS (if excess of Ag ions) and remembering that if the adsorbed ions are colored the precipitate will usually be colored, the colors of a number of indicator ions were determined By examining the behavior of dyestuffs as adsorption indicators it is possible to decide whether they are present in the form of cations or of anions.

Journal of Physical 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, Formula: C28H18O4.

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

Gustafsson, Charley published the artcileSpectrophotometric measurements on α-naphtholphthalein, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Suomen Kemistiseuran Tiedonantoja (1934), 17-23, database is CAplus.

α-Naphtholphthalein prepared according to Schulenberg (cf. C. A. 15, 80) was examined in the same way as the Sörensen-Palitsch preparation (cf. preceding abstract). The secondary and primary dissociation constants were, resp., 8.9 × 10^-8 and 5.5 × 10^-5. The secondary ion is blue in both cases, but the primary is orange-red for the former and yellow for the latter.

Suomen Kemistiseuran Tiedonantoja 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

Delcourt, R. published the artcileElectrophoretic behavior of phthaleins alone and in the presence of proteins, Quality Control of 596-01-0, the publication is Protides of the Biological Fluids (1959), 119-26, database is CAplus.

cf. C.A. 53, 5370g. The mobility of 16 phthalein dyes and their binding of human serum albumin was studied by paper electrophoresis at pH 8.6. By considering phenolphthalein as the simplest member of the series, mobility is diminished by methylation of the phenol moiety; sulfonation augments mobility without suppressing the effect of methylation, while halogenation suppresses the influence of methylation. For the formation of complexes with albumin, the presence of a halogen atom in the phthalein is essential. Affinity of halogenated phthaleins for proteins depends on the nature of the halogen (Cl < Br < I). Thus, iodophthalein is more firmly attached to the protein and is able to displace bromo- and chloro-phthalein from their protein complexes. It was not possible to determine which free groups on the protein are involved in this binding.

Protides of the Biological Fluids 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

Buch, Kurt published the artcileColor and acid characteristics of α-naphtholphthalein, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Suomen Kemistiseuran Tiedonantoja (1934), 6-17, database is CAplus.

Spectrophotometric measurements were made in alk., acid and borax buffer solutions on α-naphtholphthalein prepared according to Sörensen and Palitsch (C. A. 4, 1956). In 0.1% HCl it was nearly colorless at 0.007 g./l. The secondary ion shows absorption for wave length 649 μ, and both primary and secondary ions for 496 μ. The relative concentrations can be calculated from the extinction coefficients for these wave lengths. In this way the secondary dissociation constant is found to be 0.99 × 10^-8, and the primary 5.5 × 10^-6.

Suomen Kemistiseuran Tiedonantoja 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

Buch, Kurt published the artcileThe influence of temperature on pit determinations with color indicators, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Suomen Kemistiseuran Tiedonantoja (1930), 2, database is CAplus.

The buffer solution should preferably be brought to the temperature of sea water in situ but if Walbum’s correction tables are used this cannot be under 10°. The p_H of a sample at t° is the p_H at the buffer t + α(t_a – t_b). α from Walbum’s table: for α-naphthophthalein -0.0084, phenolphthalein -0.01, phenol red 0.01 and cresol red -0.0053. If the temperature has changed during the colorimetric readings also add α'(t_a – t_a), α’ being 0.006 for α-naphthophthalein and 0.004 for phenol and cresol red. Phenolplithalein requires no correction.

Suomen Kemistiseuran Tiedonantoja 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

Buch, Kurt published the artcileThe influence of temperature on pit determinations with color indicators, Quality Control of 596-01-0, the publication is Beret. 18th Skand. Naturforskermode (Copenhagen) (1929), 229-32, database is CAplus.

The buffer solution should preferably be brought to the temperature of sea water in situ but if Walbum’s correction tables are used this cannot be under 10°. The p_H of a sample at t° is the p_H at the buffer t + α(t_a -t_b). α from Walbum’s table: for α-naphthophthalein -0.0084, phenolphthalein -0.01, phenol red 0.01 and cresol red -0.0053. If the temperature has changed during the colorimetric readings also add α'(t’_a – t_a), α’ being 0.006 for α-naphthophthalein and 0.004 for phenol and cresol red. Phenolplithalein requires no correction.

Beret. 18th Skand. Naturforskermode (Copenhagen) 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

Buch, Kurt published the artcileSpectrophotometric investigation of color indicators, HPLC of Formula: 596-01-0, the publication is Soc. Sci. Fennica Commentationen. Phys. Math. (1926), 2(Nos. 19-30), 20 pp., database is CAplus.

The spectrophotometer offers certain advantages for determining p_H values, particularly in natural waters such as sea water. If the relationship between light absorption and hydrogen-ion concentration is known, no comparison solution is necessary. In this paper the optical properties of α-naphtholphthalein, bromocresol purple, bromothymol blue and phenol red were studied near the neutral point. The light absorption of solutions of definite concentration for different wave lengths was determined both in alk. and in acid solution This is necessary to show the sort of light most suitable for the colorimetric determinations The indicators mixed with buffer solutions were then studied with the light of chosen wave length with respect to the dependence of the light absorption upon H-ion concentration In this way the ionization constants of the indicators were determined with considerable accuracy.

Soc. Sci. Fennica Commentationen. Phys. Math. 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, HPLC of Formula: 596-01-0.

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

Aulin-Erdtman, Gunhild published the artcileValue of indicators for the determination of the acid number of tall oil, SDS of cas: 596-01-0, the publication is Svensk Papperstidning (1942), 333-5, database is CAplus.

The suitability of α-naphtholphthalein and Nile blue as indicators for the determination of the acid number of tall oil was investigated by means of potentiometric titrations on alc. solutions of model substances (oleic acid and purified resin acids) as well as of a distilled tall oil, in the presence of these indicators. Both indicators proved to be suitable but Nile blue could be used only if the solution contained less than 10% of water, because the color of this indicator in the range of the end point depends upon its water content. When α-naphtholphthalein is used, the end point should be taken at a dark-green color; Nile blue requires a shade between red and scarlet. Where greater accuracy is demanded, the potentiometric method should be used.

Svensk Papperstidning 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

Arbatsky, I. W. published the artcileTitration theory of dilute solutions, Name: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Zeitschrift fuer Analytische Chemie (1938), 117-26, database is CAplus.

The theory of titrating dilute solutions is discussed with respect to the magnitude of the error and the determination of the proper correction values. The titration of carbonates with phenolphthalein and α-naphtholphthalein as indicators is discussed in detail and the formulas for determining the correction factor are worked out. The advantages of the latter indicator are pointed out with respect to this titration.

Zeitschrift fuer Analytische Chemie 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, Name: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one.

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

Guo, Fang published the artcileMoracin M inhibits lipopolysaccharide-induced inflammatory responses in nucleus pulposus cells via regulating PI3K/Akt/mTOR phosphorylation, COA of Formula: C14H10O4, the publication is International Immunopharmacology (2018), 80-86, database is CAplus and MEDLINE.

Moracin M, a phenolic component obtained from Mori Cortex, has been reported to have anti-inflammatory activities. The present study was designed to investigate the effects and mechanisms of Moracin M on lipopolysaccharide (LPS)-treated nucleus pulposus cells (NPCs) in intervertebral disk. NPCs were treated with moracin M at different concentrations for 1 h and then stimulated with LPS (0.5μg/mL) for 24 h. The result demonstrated that moracin M could significantly inhibit LPS-induced inflammation. The elevated levels of IL-1β, TNF-α and IL-6 induced by LPS could be reversed by moracin M in NPCs. Moreover, moracin M increased the expressions of autophagy-related proteins and up-regulated the phosphorylation of PI3K/Akt/mTOR in LPS-treated NPCs. In conclusion, our data demonstrated that moracin M might inhibit LPS-induced PI3K and Akt phosphorylation, which leading to promote the autophagy and inhibit the inflammatory mediator production in NPCs.

International Immunopharmacology published new progress about 56317-21-6. 56317-21-6 belongs to benzofurans, auxiliary class Metabolic Enzyme,PDE,Natural product, name is 5-(6-Hydroxybenzofuran-2-yl)benzene-1,3-diol, and the molecular formula is C14H10O4, COA of Formula: C14H10O4.

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