Showing papers on "Color reaction published in 1985"
TL;DR: A new colorimetric procedure is described for inorganic phosphate determination using the color reaction between in organic phosphate and acidified ammonium molybdate in the presence of Triton X-100, which produces results comparable with those of the widely used method of Fiske-Subbarow.
37 citations
TL;DR: A color reaction of 1, 2-diphenols, such as catecholamines (CA), caffeic acid and gocypol, utilizing colored complex formation among a 1, 1-Diphenol, an organic reagent and a metal ion was studied, and suitable conditions for the spectrophotometric determination of norepinephrine (NE) with phenylfluorone and iron (III) were established.
Abstract: A color reaction of 1, 2-diphenols, such as catecholamines (CA), caffeic acid and gocypol, utilizing colored complex formation among a 1, 2-diphenol, an organic reagent and a metal ion was studied, and suitable conditions for the spectrophotometric determination of 1, 2-diphenols [as norepinephrine (NE), a CA] with phenylfluorone and iron (III) were established. The optimum pH range for the formation of colored complexes in the presence of polyoxyethylene monolauryl ether was pH 8.9-9.9. In the case of NE, the method could be used to determine up to ca. 10μg/10ml, and the apparent molar absorptivity at 630nm was 1.7×105dm3mol-1cm-1. This method was applied to the assay of CA in commercial pharmaceutical preparations. A detection test for CA on a spot plate was also examined.
17 citations
TL;DR: In this paper, a trace amount of iodate and periodate in aqueous solution was determined spectrophotometrically, based on the reaction of the ions with p-phenylenediamine, in acidic medium, to form pink-red-colored species with maximum absorption at 520 nm and adherence to Beer's law over wide concentration ranges of the ion.
17 citations
Patent•
12 Dec 1985
TL;DR: In this article, a quasi-reversible thermally color changing composition is presented, which is obtained by blending a quasireversible polyethylene or polypropylene with 0.1W75wt% quasi-regenerative thermally colour changing composition, consisting of a homogeneous compatibilized material.
Abstract: PURPOSE: The titled composition, obtained by blending a quasi-reversible thermally color changing composition capable of exhibiting a specific hysteresis width and Δ t value concerning a color density-temperature curve with a resin and capable of keeping a different color within a specific temperature region. CONSTITUTION: A composition obtained by blending a resin, e.g. polyethylene or polypropylene, etc., with 0.1W75wt% quasi-reversible thermally color changing composition, consisting of a homogeneous compatibilized material consisting essentially of (A) an electron donative coloring organic compound, e.g. crystal violet lactone, etc., (B) an electron accepting compound, e.g. alkylphenol, etc., and (C) a compound to be medium capable of initiating a color reaction of the components (A) and (B), e.g. ≥8C aliphatic monohydric alcohol, etc., and capable of exhibiting 5W80°C hysteresis width and 1W30°C Δ t value in a color density-temperature curve. COPYRIGHT: (C)1987,JPO&Japio
11 citations
TL;DR: In this article, a mixture of methanol and acetonitrile was used as the organic solvents in the eluent, which contained concentrated ammonia, ammonium chloride and ammonium carbonate.
9 citations
Patent•
16 Aug 1985
TL;DR: A bacterium (e.g., Streptomyces sioyaensis subsp. tanegashimaensis No.9979) capable of producing FR-900336 substance is inoculated into a medium and cultivated aerobically at 20-40 deg.C for 50-100hr as discussed by the authors.
Abstract: NEW MATERIAL:FR-900336 Substance having the following physical and chemical properties. Shape and color: light yellow and needle-like crystal. Color reaction: positive in Dragendorff's reaction. Solubility: soluble in chloroform, acetone, ethyl acetate, and methanol, slightly soluble in ethanol, and insoluble in water. Melting point: browning gradually from 214 deg.C. Specific rotatory power: [alpha]D = 365 deg.(C=0.1, CHCl3). Ultraviolet absorption spectrum: table-1. Infrared absorption spectrum: table-2, etc. USE:A drug having an antibacterial action on Staphylococcus aureus, Bacillus subtilis, etc. PREPARATION:A bacterium (e.g., Streptomyces sioyaensis subsp. tanegashimaensis No.9979) belonging to the genus Streptomyces, capable of producing FR- 900336 substance, separated from soil of Tanegashima Island in Kagoshima Prefecture is inoculated into a medium and cultivated aerobically at 20-40 deg.C for 50-100hr.
8 citations
8 citations
TL;DR: In this paper, the chemical structures of the reaction product of glucose (I) and that of rhamnose (II) were established to be 2-[(4-hydroxy-3-methyl-naphth-1-yl) methyl]-5-[(3methyl-4-oxo-Naphth]-methyl] furan and 5]-(3-methylfuran, respectively, and were used to elucidate the reaction mechanism of the Molisch reaction.
Abstract: 2-Methyl-1-naphthol was found to develop characteristic color with hexoses and pentoses in concentrated sulfuric acid very sensitively, and was used to elucidate the reaction mechanism of the Molisch reaction. The chemical structures of the reaction product of glucose (I) and that of rhamnose (II) were established to be 2-[(4-hydroxy-3-methyl-naphth-1-yl) methyl]-5-[(3-methyl-4-oxo-naphth-1-ylidene) methyl] furan and 5-[(3-methyl-4-oxo-naphth-1-ylidene) methyl]-2-methylfuran, respectively.
8 citations
Patent•
05 Mar 1985
TL;DR: In this paper, a process for encapsulating solutions of reactants of color reaction systems by means of conventional encapsulation processes, the reactant initially being dissolved in a solvent with a good dissolving power and immediately prior to emulsification or encapsulation, is admixed with the fresh solution obtained in a quantity which adjusts a supersaturated system, the capsulates obtainable as a result thereof, as well as their use with an encapsulated solution of a basic color former which supplies a color by the reaction with acid reactants, in non-carbon paper.
Abstract: The invention relates to a process for encapsulating solutions of reactants of color reaction systems by means of conventional encapsulation processes, the reactant initially being dissolved in a solvent with a good dissolving power and immediately prior to emulsification or encapsulation, a non-solvent, which only dissolves the reactant to an insignificant extent, is admixed with the fresh solution obtained in a quantity which adjusts a supersaturated system, the capsulates obtainable as a result thereof, as well as their use with an encapsulated solution of a basic color former, which supplies a color by the reaction with acid reactants, in non-carbon paper.
8 citations
TL;DR: The azomethine derivatives 8-hydroxy-1-(2-hydrox-1-naphthylbenzylideneamino)naphthalene-3,6-disulphonic acid (HSNHB) and HSNHN were synthesized in this paper.
Abstract: The azomethine derivatives 8-hydroxy-1-(2-hydroxy-1-naphthylbenzylideneamino)naphthalene-3,6-disulphonic acid (HSNHB) and 8-hydroxy-1-(2-hydroxy-1-naphthylmethyleneamino)naphthalene-3,6-disulphonic acid (HSNHN) were synthesised. HSNHB gives no colour reaction with boric acid, but HSNHN reacts with boric acid and produces a compound with maximum absorbance at 445 nm (pH 4) in a 30%V/V methanol-water solution. Beer's law is obyed between 0.25 and 2 µg ml–1 of boron. The molar absorptivity at 445 nm is 8700 l mol–1 cm–1. Interferences from Fe3+, Al3+ and Cu2+ are avoided by adding EDTA. This method has been applied to the determination of boron in natural waters and vegetable matter with good accuracy.
6 citations
TL;DR: Use of ferric acetate-uranium acetate reagent provides a simpler and quicker method that does not suffer from interference due to the presence of Mn2+ ions and gives results comparable to the o-phthalaldehyde method and those using ultracentrifugation as the separation procedure.
TL;DR: In this article, a ternary complex with chromal blue G, a triphenylmethane reagent in the presence of cetyltrimethylammonium chloride, is described.
TL;DR: In this paper, a sensitive spectrophotometric method for the determination of oxine in aqueous solution is investigated, based on the reaction of the analyte with diazotized p-aminoacetophenone to form, in the presence of sodium hydroxide, an intense cherry-red water-soluble and stable azo dye which shows maximum absorption at 520 nm.
Abstract: A sensitive spectrophotometric method for the determination of oxine in aqueous solution is investigated. It is based on the reaction of the analyte with diazotized p-aminoacetophenone to form, in the presence of sodium hydroxide, an intense cherry-red water-soluble and stable azo dye which shows maximum absorption at 520 nm. The linear absorbance plot with the concentration indicates that Beer's law is adhered over the range 10–100μg of oxine in a final volume of 25 ml, i.e., 0.4–4 ppm, with a molar absorptivity of 3.37 × 104 1mol−1 cm−1, a relative error of +0.44 to –1.12%, and a relative standard deviation of 0.54–2.9%, depending on the level of analyte concentration. The optimum conditions affecting the color reaction and interference due to foreign organic compounds have been examined.
TL;DR: Antimony(III) interacts with tris[2,4,6-(2-hydroxy-4-sulpho-1-naphthylazo)]-s-triazine trisodium salt (THT) to give a 1 : 1 dark red complex at pH 3.3-7.0 as discussed by the authors.
Abstract: Antimony(III) interacts with tris[2,4,6-(2-hydroxy-4-sulpho-1-naphthylazo)]-s-triazine trisodium salt (THT) to give a 1 : 1 dark red complex at pH 3.3–7.0. Sandell's sensitivity of the colour reaction at λmax. 535 nm is 0.0029 µg cm–2 of Sb (Iµ= 4.16 × 104 l mol–1 cm–1). Among the anions, sulphide only decomposes the antimony-THT complex quantitatively replacing THT from the complex and 6–52 µg per 25 ml of sulphide are determined indirectly.
TL;DR: The reaction product responsible for the characteristic coloration of the Seliwanoff reaction was isolated and determined to be 2, 7-diethyl-6-hydroxy-9-(5-methyl-2-furyl)-3H-xanthen-3-one.
Abstract: 4-Ethylresorcinol was found to be a very sensitive color-developing reagent for the detection of ketoses, and was used to elucidate the reaction mechanism of the Seliwanoff reaction. The reaction product (I) responsible for the characteristic coloration of the Seliwanoff reaction was isolated and determined to be 2, 7-diethyl-6-hydroxy-9-(5-methyl-2-furyl)-3H-xanthen-3-one. Compound I was also isolated as crystals from the reaction mixture obtained by Kulka's modified method using 4-ethylresorcinol as the color-developing reagent.
TL;DR: In this article, it was shown that D-homogenization of 17α-hydroxyprogesterone (1) in 80% sulfuric acid gave two Dhomosteroids through C (13)-C (17) bond migration, 17aβ-hydrox-17aα-methyl-D-homoandrost-4-ene-3.
Abstract: Dissolution of 17α-hydroxyprogesterone (1) in 80% sulfuric acid gave two D-homosteroids through C (13)-C (17) bond migration, 17aβ-hydroxy-17aα-methyl-D-homoandrost-4-ene-3, 17-dione (2) and 17a-methylene-D-homoandrost-4-ene-3, 17-dione (3), in 53 and 9% yields, respectively. The latter product was also obtained in 73% yield from the reaction of 1 with 90% sulfuric acid. Proton nuclear magnetic resonance (1H-NMR) studies of the acid solutions revealed that the D-homoannulation of 1 to 2 occurs rapidly even in 80 or 90% sulfuric acid, and that 2 is dehydrated rapidly to 3 in 90% sulfuric acid. The D-homoannulation was demonstrated to be an initial step in the color and fluorescence reaction of 1 with sulfuric acid.
Patent•
03 Jun 1985
TL;DR: In this article, a thiourea derivative is mixed as a color developer with an electron-donative color reaction organic compound and a desensitizer such as an alcohol.
Abstract: PURPOSE:To provide the titled composition free of or low in toxicity, unlimited in use and showing stable thermal color-changeability even when being repeatedly used for a long period of time, wherein a thiourea derivative is mixed as a color developer with an electron-donative color reaction organic compound and a desensitizer such as an alcohol CONSTITUTION:The objective composition is obtained by mixing (A) an electron- donative color reaction organic compound, preferably, crystal violet lactone or the like, as a color former, (B) a compound selected from thiourea and derivatives thereof, eg, thiourea, as a color developer, and (C) a compound selected from alcohols, esters, ketones, ethers, acid amides and carboxylic acids, preferably, cyclohexane or the like, as a desensitizer The components are used in an A:B:C weight ratio of 1:1/2-50:1-50
Patent•
01 Jun 1985
TL;DR: In this article, a bacterium belonging to the genus Flavobacterium chitinovorum sp. nov. (FERM-P 7085) is newly separated from soil.
Abstract: PURPOSE:To obtain novel antibiotic chitinovorin-A and chitinovorin-B having antibacterial action on Gram-positive and Gram-negative bacteria, by cultivating a bacterium belonging to the genus Flavobacterium. CONSTITUTION:Flavobacterium chitinovorum sp. nov. (FERM-P 7085) is newly separated from soil. The mold is aerobically cultivated in an ordinary medium, to give novel antibiotic chitinovorin-A and chitinovorin-B. Both of them havin the following properties. Appearance: colorless powder. Solubility in solvent: soluble in water and dimethyl sulfoxide, slightly soluble or insoluble in other organic solvent. Color reaction: positive in ninhydrin reaction. Distinction of basicity, acidity, and neutrality: basic substance having amphoteric properties. Found value of elemental analysis of diacetyl-substituted derivative of them: C, 46.28, H, 6.89, N, 16.2, S, 4.35.
TL;DR: In this article, a simple and sensitive color reaction of common epoxides as well as other some alkylating agents with 4-acetylpyrldine 2-benzothiazolylhydrazone (ABH) is described.
Abstract: A simple and sensitive color reaction of common epoxides as well as other some alkylating agents with 4-acetylpyrldine 2-benzothiazolylhydrazone (ABH) is described. These compounds gave a purpllsh red color after reaction with ABH for 2 hrs at 110°C in methyl cellosolve or for 20 min at 120°C followed by treatment with plperazlne on silica gel thin-layer plates. Four aliphatic terminal epoxides could be determined spectrophotometrically in the range from 20 to 125 nmol/ml. The limits of detection of these epoxides on silica gel thin-layer plates were 10 pmol/spot order by the visual inspection. The reaction mechanism is also discussed based on the chemical structure of the isolated chromophore.
Patent•
[...]
01 Oct 1985
TL;DR: The FR-900462 substance having the following physical and chemical properties Shape and color, pale yellow powder; elemental analysis (%), C 6260, H 701, N 811; color reaction, positive to cerium sulfate reaction, iodine reaction, ninhydrin reaction and Dragendorff reaction, negative to palladium reaction; solubility, soluble in methanol and acetone, slightly soluble in ethanol and chloroform, insoluble in water and benzene; melting point, 178- 182 degC; specific rotation, [alpha] D=+186
Abstract: NEW MATERIAL:The FR-900462 substance having the following physical and chemical properties Shape and color, pale yellow powder; elemental analysis (%), C 6260, H 701, N 811; color reaction, positive to cerium sulfate reaction, iodine reaction, ninhydrin reaction and Dragendorff reaction, negative to palladium reaction; solubility, soluble in methanol and acetone, slightly soluble in ethanol and chloroform, insoluble in water and benzene; melting point, 178- 182 degC; specific rotation, [alpha] D=+186 deg (C:105, methanol); etc USE:Antibacterial agent and antitumor agent PREPARATION:For example, Elytrosporangium tashikiense No7124 (FERM P- 7393) belonging to Elytrosporangium genus is cultured in a nutrient medium, the culture liquid is centrifuged to separate the mycelia The product is extracted with acetone, etc, and purified by column chromatography, etc to obtain the novel substance
TL;DR: In this article, it was shown that a highly sensitive chromogenic reagent, 2-(4,5-methylthiazolyl-2-azo)-5-diethylaminophenol (DMTAE), for bismuth, cadmium, gallium ions and so on, can be obtained by coupling m-DETHL with a diazo salt of alkylthiazole.
Abstract: Spectrophotometry is a sensitive method for the determination of microamounts of bismuth in a wide variety of materials. But the sensitivity of present spectrophotometry procedures is too poor to meet some practical requirements 1-3. More recently some new ternary complexes for bismuth with chr0mogenic reagents, such as pyrogallol red 5, catechol violet 4, dibromophenylfluorone 6 have been proposed, but they are still not sensitive enough. Only the last of them shows a little higher sensitivity. It is, therefore, necessary to make further efforts to seek some new chromogenic reagents for bismuth with higher sensitivity. Savvin and coworkers 7 had synthesized some new colour reagents derived from alkyl thiazole as a parent compound which is merely sensitive for some metal ions. Further studies indicated that a highly sensitive chromogenic reagent, 2-(4,5-methylthiazolyl-2-azo)-5-diethylaminophenol (DMTAE), for bismuth, cadmium, gallium ions and so on could be obtained by coupling m-diethylaminophenol with a diazo salt of alkylthiazole. The sensitivity (shown as molar absorptivity) of the colour reaction between bismuth and this reagent either in 30% (V/V) ethanol or in the presence of a surfactant is about 1051.mole -1-cm -1. In this paper we shall describe the properties of this reagent, conditions of
Patent•
13 Nov 1985
TL;DR: In this article, a T-cell synthesis suppressing substance effective to suppress the DNA synthesis of T-cells is presented, which can be collected from mammal serum or the body fluid or cultured cell of insects such as silkworm moth, saturniid, flesh fly, honeybee, etc.
Abstract: NEW MATERIAL:A T-cell synthesis suppressing substance effective to suppress the DNA synthesis of T-cell. Elemental analysis, contains C, H, O, N and S; molecular weight, a peptide having a molecular weight of about 1,000 Dalton; thermal stability, stable at 56 deg.C for 1hr and 110 deg.C for 30min; nature, weakly basic; pH stability, stable at 4.0-9.5pH; ultraviolet absorption spectrum, absorption peak at 220nm; color reaction, positive to ninhydrin reaction; solubility, easily soluble in water, methanol and ethanol; color, colorless when dissolved in the above solvents. USE:Remedy for autoimmune diseases. Low side effects such as hypoadrenalism, leucopenia, etc. Applicable also as an antibacterial substance against Gram-negative bacteria. PREPARATION:The compound can be collected from mammal serum or the body fluid or cultured cell of insects such as silkworm moth, saturniid, flesh fly, honey-bee, etc.
Patent•
04 May 1985
TL;DR: Chitinovorin-C shown by the formula and its salt as mentioned in this paper shows the following physical and chemical properties (all are measured by Na salt except molecular weight): Molecular weight: 416.5pH at 25-32 deg.C for 20-80hr.
Abstract: NEW MATERIAL:Chitinovorin-C shown by the formula and its salt. Showing the following physical and chemical properties (all are measured by Na salt except molecular weight). Molecular weight: 416. Solubility: soluble in water or dimethyl sulfoxide, slightly soluble or insoluble in methanol, ethanol, acetone, chloroform, or ethyl acetate. Color reaction: positive in ninhydrin reaction, or Sakaguchi reaction. Appearance: colorless powder. An acidic substance having amphoteric properties, etc. USE:An antibacterial agent against Gram-positive and Gram-negative bacteria, and a raw material for a novel antibiotic containing formylamino group. PREPARATION:A strain such as Flavobacterium chitinovorum (FERM-P 7085), etc. belonging to the genus Flavobacterium is cultivated in a medium preferably at 5.5-8.5pH at 25-32 deg.C for 20-80hr.
Patent•
11 Nov 1985
TL;DR: The thermal color forming composition comprises a color former, a color reaction agent and a binder selected from an alkyl starch and a hydroxyalkylalkyl starch, as main constituents as mentioned in this paper.
Abstract: PURPOSE:To contrive formation of a thermal color forming layer which has an excellent effect of preventing development of ground color and is rigid, by using a color former, a color reaction agent and a binder selected from an alkyl starch and a hydroxyalkylalkyl starch. CONSTITUTION:The thermal color forming composition comprises a color former (a), a color reaction agent (b) and a binder (c) selected from an alkyl starch and a hydroxyalkylalkyl starch, as main constituents. The combination of component (a) and component (b) for performing a color reaction by making contact with component (a) may be combination of a basic dye with an inorganic or organic acidic substance or a combination of a metallic salt of a long chain fatty acid such as ferric stearate and ferric myristate with a phenol such as tannic acid and gallic acid. Component (a) is desirably used in an amount of 10-60wt%, particularly, 15-40wt%, to the total amount of components (a), (b) and (c).
Patent•
12 Feb 1985
TL;DR: In this paper, a fungus capable of producing FR-900216 substance, which has the following physical and chemical properties and its salt, is described: chemical properties, specific rotatory power: [alpha]D =+140 deg.
Abstract: NEW MATERIAL:FR-900216 Substance having the following physical and chemical properties and its salt. Molecular weight: 625(mass spectrometry). Estimated molecular formula: C35H47NO9. Melting point: 130-135 deg.C(decomposition). Specific rotatory power: [alpha]D =+140 deg.(C=1, in CHCl3). Solubility: easily soluble in methanol, acetone, ethyl acetate, soluble in chloroform and benzene, slightly soluble in hexane, ethyl ether, insoluble in water. Color reaction: positive in Dragendorff's reaction and iodine reaction, and negative in ferric chloride reaction, Molish reaction, etc. USE:An antitumor agent. PREPARATION:A fungus [e.g., Rhizopus sp. NO.F-1360(FERM-P 5362), etc.] belonging to the genus Rhizopus, capable of producing FR-900216 substance, is cultivated in a medium and the substance is collected and separated from the culture.
Patent•
23 Dec 1985
TL;DR: In this paper, a new compound, designated FR-68504, has been developed which has antitumor activities and is effective in the treatment of various tumors in both human beings and animals.
Abstract: 57 The invention relates to a new compound, designated FR-68504. The compound has antitumor activities and is effective in the treatment of various tumors in both human beings and animals.There is also provided a process for preparing FR-68504 compound which comprises culturing a FR-68504 producing strain belonging to the genus Amauroascus in a nutrient medium.Pharmaceutical composition comprising FR-68504 as an active ingredient is also described.f) UV absorption spectrum :End absorption (in H20)g) IR absorption spectrum :Nujol: 3400, 3250, 1300, 1100, 1030, 950, max 850 cm-1h) 1H NMR absorption spectrum : (D20) δppm: 3.94-3.78 (4H, m), 3.57 (lH, dd, J=9.2 and 5.3Hz), 3.36-3.25 (2H, m), 3.01-2.88 (4H, m)i) 13C NMR absorption spectrum : (D20) δppm: 71.0 (d), 70.6 (d), 70.4 (d), 69.6 (d), 68.6 (d) , 55.1 (d), 53.5 (d) , 46.6 (t), 46.5 (t)j) Solubility :Soluble : WaterSparingly soluble : Methanol, ethanol, acetoneInsoluble : Ethyl acetate, chloroformk) Color reaction :Positive : Molish's reaction, reaction with cerium sulfateNegative : Ninhydrin reaction, ferric chloride-potassium ferricyanide reaction, reaction with Dragendorff reagent or iodine vapor.1) Property of substance :Neutral substancem) Thin layer chromatography (silica gel sheet) :The FR-68504 can be prepared by culturing a FR-68504-producing strain belonging to the genus
TL;DR: An indirect spectrophotometric determination of 10−50 μg of hydroquinone, p-amino-phenol, and Metol has been developed in this article based on the oxidation of these substances with the fluoride complex of trivalent manganese, the unreacted reagent being determined by the color reaction with o-tolidine.
Patent•
08 Feb 1985
TL;DR: In this paper, a method for Einkapsein of solutions of reactants of color reaction systems using conventional encapsulation process, wherein the reactant is first dissolved in a solvent good dissolving power and the obtained fresh solution directly from the emulsifying or encapsulating a non-solvent which dissolves the reactants but at best insignificantly, is mixed in an a supersaturated system dividing one amount, the capsules thereafter available, and their use with an encapsulated solution of a basic color former which provides by the reaction with acidic reactants, a color, in color reaction
Abstract: The invention relates to a method for Einkapsein of solutions of reactants of color reaction systems using conventional encapsulation process, wherein the reactant is first dissolved in a solvent good dissolving power and the obtained fresh solution directly from the emulsifying or encapsulating a non-solvent which dissolves the reactants but at best insignificantly, is mixed in an a supersaturated system dividing one amount, the capsules thereafter available, and their use with an encapsulated solution of a basic color former which provides by the reaction with acidic reactants, a color, in color reaction papers.