摘要:
A keratin fiber strengthening agent comprising 0.001 to 20% by weight of at least one (2S,3R)-2-acylaminoalkane-1,3-diol represented by formula (I): wherein R1 represents a straight-chain alkyl group having 9 to 17 carbon atoms; and R2 represents an acyl group having 2 to 24 carbon atoms which may contain at least one hydroxy group or unsaturated bond is disclosed. A method for improving physical properties, such as breaking strength, of keratin fiber such as hair comprising applying the keratin fiber strengthening agent to keratin fiber by adhesion, coating or impregnation is also disclosed.
摘要:
An optically active (2S,3R)-2-(3'-hydroxyacyl)aminoalkane-1,3-diol and a process for producing the same are disclosed. The compound is represented by the following general formula (1): ##STR1## wherein R.sup.1 represents a linear or branched, saturated aliphatic hydrocarbon group having 9 to 19 carbon atoms; R.sup.2 represents a linear or branched, saturated aliphatic hydrocarbon group having 1 to 19 carbon atoms; and symbol * means that the carbon atom is an asymmetric carbon atom of the S or R configuration. The optically active compound is a ceramide in which the fatty acid moiety has an optically active hydroxyl group in the 3-position.
摘要:
A method of selective N-acylation of an aminodiol having a primary alcoholic hydroxyl group and a secondary alcoholic hydroxyl group, in which the objective product can be prepared in high yield and without troublesome extraction and purification operations. More particularly, a method of making a primary amide derivative represented by the following general formula (3) is disclosed: ##STR1## wherein R.sup.1 represents a linear saturated aliphatic hydrocarbon group having 11 to 19 carbon atoms, R.sup.2 represents a linear saturated or unsaturated aliphatic hydrocarbon group having 9 to 19 carbon atoms which may have a hydroxyl group at the 1-position, which includes the steps of reacting an aminodiol represented by the following general formula (1): ##STR2## wherein R.sup.1 is the same as R.sup.1 in general formula (3) with a fatty acid alkyl ester represented by the following general formula (2): R.sup.2 --COO--R.sup.3 (2) wherein R.sup.2 is the same as R.sup.2 in general formula (3) and R.sup.3 represents a lower alkyl group, in a reaction system comprising an alcoholic solvent and in the presence of a basic catalyst, said reacting step forming a lower alcohol as a by-product; and removing the lower alcohol formed during the reaction from the reaction system.
摘要:
The cool feeling composition of the present invention obtained by combining a cool feeling substance containing at least one compound selected from 1-menthol, isopulegol, 3-(1-menthoxy)propane-1,2-diol, 2-(1-menthoxy)ethan-1-ol, 3-(1-menthoxy)propan-1-ol, 2-methyl-3-(1-menthoxy)propane-1,2-diol, N-ethyl-l-menthylcarboxamide, p-menthane-3,8-diol, 1-menthyl lactate, and 2-isopropyl-N, 2,3-trimethylbutanamide with a salicylic acid ester represented by the following general formula (I), such as 2-hydroxyethyl salicylate, improves strength and persistency of cool feeling effect, particularly, those containing 1-menthol as the cool feeling substance can alleviate the irritant fragrance note resulting from 1-menthol. Mixing of the cool feeling composition or fragrance composition containing the same with products such as foods and drinks, cosmetics, toiletry products, bath agents, and pharmaceuticals can afford products wherein the above features of the cool feeling composition of the invention are effectively exerted. wherein R represents a hydrocarbon group having 1 to 18 carbon atoms which may has a substituent.
摘要:
The invention has an object of providing a hinokitiol which is not damaged in the antibacterial activity and improved in the water solubility, heat stability (anti-sublimation characteristics) and corrosion to metals and also providing a composition comprising a hinokitiol. The invention resides in a clathrate compound comprising clathration of hinokitiols by using a branched cyclodextrin such as a branched &bgr;-cyclodextrin. The clathrate compound can be used in various applications requiring an antibacterial activity, such as hair cosmetics, bath agents, skin cosmetics and oral compositions.
摘要:
The cool feeling composition of the present invention obtained by combining a cool feeling substance containing at least one compound selected from 1-menthol, isopulegol, 3-(1-menthoxy)propane-1,2-diol, 2-(1-menthoxy)ethan-1-ol, 3-(1-menthoxy)propan-1-ol, 2-methyl-3-(1-menthoxy)propane-1,2-diol, N-ethyl-1-menthylcarboxamide, p-menthane-3,8-diol, 1-menthyl lactate, and 2-isopropyl-N,2,3-trimethylbutanamide with a salicylic acid ester represented by the following general formula (I), such as 2-hydroxyethyl salicylate, improves strength and persistency of cool feeling effect, particularly, those containing 1-menthol as the cool feeling substance can alleviate the irritant fragrance note resulting from 1-menthol. Mixing of the cool feeling composition or fragrance composition containing the same with products such as foods and drinks, cosmetics, toiletry products, bath agents, and pharmaceuticals can afford products wherein the above features of the cool feeling composition of the invention are effectively exerted. wherein R represents a hydrocarbon group having 1 to 18 carbon atoms which may has a substituent.
摘要:
A process for preparing an optically active dihydrosphingosine derivative is disclosed, comprising reducing a (2R,3R)-2-amino-3-hydroxyalkanoic acid derivative represented by formula (III): ##STR1## wherein R.sup.3 represents a straight-chain alkyl group having 7 to 21 carbon atoms; and R.sup.4 represents an amino group protecting group, (e.g., (2R,3R)-2-benzylamino-3-hydroxyoctadecanoic acid) with sodium tetrahydroborate in the presence of an acid. The process makes it feasible to produce an optically active dihydrosphingosine at high optical purity and through a simple process that is safe and easy to industrialize.
摘要:
The present invention provides an antibacterial and fungicidal agent containing an amino compound of formula (1) or a salt thereof. The invention also provides a method for imparting antibacterial and fungicidal properties to a variety of objects using the compound. ##STR1## wherein .phi. represents a phenyl group, a substituted phenyl group (wherein the substituents are 1-5 members arbitrarily selected from the group consisting of a hydroxyl group, halogen atoms, lower alkoxyl groups, trifluoromethyl group, an amino group, and a methylenedioxy group), or an imidazolyl group; R.sup.1 represents a hydrogen atom or a lower alkyl group; and R.sup.2 represents a C6-C12 alkyl group. The amino compound of formula (1) or a salt thereof exhibits excellent antibacterial effects and fungicidal effects, and when it is applied to a variety of articles used in industry, commodities, etc., enhanced antibacterial effects and fungicidal effects are obtained.
摘要:
Disclosed is a method for producing (3S)-l-menthyl 3-hydroxybutyrate of the following formula (I) by subjecting l-menthyl acetoacetate to asymmetric hydrogenation. The compound may be used as a cooling component or sensate component which does not have undesirable stimulus feeling, bitterness and the like and is excellent in the persistence of refresh-feeling and cool-feeling.
摘要:
Disclosed is a cooling sensation agent composition or sensory stimulation agent composition which contains at least one of diester compounds of dicarboxylic acid represented by the formula (1) wherein A represents CH2 or CH═CH, n represents an integer of 0 to 4 when A is CH2, or 1 when A is CH═CH, B is an alcohol residue having 10 to 18 carbon atoms and containing a para-menthane skeleton, which may have a substituent, and C is an alcohol residue having 6 to 18 carbon atoms, which may have a substituent as well as a flavor or fragrance composition, a beverage, a food product, a perfume or cosmetic product, a toiletry product, daily utensil products or groceries, a fiber, a fiber product, clothes, clothing or a medicine, wherein the cooling sensation agent composition or the sensory stimulation agent composition is compounded.