Abstract: Histidine derivatives and processes of preparing the histidine derivatives. The histidine derivatives can be used to combat free radicals. The histidine derivatives may be used in cosmetic and/or dermatological compositions.

Abstract: The present invention relates to new compounds, which are N.sup..delta. -substituted ornithine derivatives, having the formula (I)HOOC--CH(NH.sub.2)--(CH.sub.2).sub.3 --NH--(X).sub.h --(CH.sub.2).sub.j --(CHOH).sub.k --(CH.sub.2).sub.m --(O).sub.n --(CH.sub.2).sub.p --Rin which R represents a hydrocarbon alkyl radical or a perfluorinated alkyl radical, X is a divalent radical chosen from --CO--O--, --CO--NH-- and --SO.sub.2 --, h, j, k, m and n are, independently, zero or 1 and p is zero to 4, a salt of a compound of formula (I), an optical isomer of D or L configuration thereof or a mixture thereof. The invention also relates to a process for the preparation of these compounds, to their use, especially in cosmetics, and to compositions, especially cosmetic compositions, comprising them.

Abstract: New lysine derivatives containing a fluoroalkyloxycarbonyl or fluoroalkylsulphonyl group of formula:COOH--CH(NH.sub.2)--(CH.sub.2).sub.4 --NH--X--(CH.sub.2).sub.n --Rin which n ranges from 0 and 4, X represents a divalent COO or SO.sub.2 group and R represents a linear or branched perfluoroalkyl radical having from 4 to 20 carbon atoms, salts thereof, and mixtures of the derivatives and the salts. A process for the preparation of these derivatives, salts, and mixtures and use of such derivatives, salts, and mixtures, especially in cosmetics. Compositions, especially cosmetic compositions, comprising the derivatives, salts, and mixtures.

Abstract: New lysine derivatives containing a containing an alkylsulphonyl or alkylaminocarbonyl group of formula (I):COOH--CH(NH.sub.2)--(CH.sub.2).sub.4 --NH--Xin which X represents an --SO.sub.2 R or --CONHR group, where R represents a linear or branched, saturated or unsaturated, alkyl radical having from 8 to 22 carbon atoms, salts thereof, and mixtures of the derivatives and the salts. A process for the preparation of these derivatives, salts, and mixtures and use of such derivatives, salts, and mixtures, especially in cosmetics. Compositions, especially cosmetic compositions, comprising the derivatives, salts, and mixtures.

Abstract: Lysine derivatives, the salts of the derivatives, their optical isomers of D or L configuration, or their mixtures, the derivatives containing an N.sup..epsilon. -alkoxy or N.sup..epsilon. -alkenoxycarbonyl group of formula: ##STR1## in which: R represents a linear or branched C.sub.13 -C.sub.24 alkyl radical, the C.sub.16 radical being branched, or a linear or branched C.sub.8 -C.sub.24 alkenyl radical. The lysine derivatives are used in cosmetic, pharmaceutical hygiene or food compositions.

Abstract: New arginine derivatives containing an N.sup..alpha. -alkyloxycarbonyl group of formula (I) ##STR1## in which R represents a linear or branched alkyl radical having from 8 to 22 carbon atoms, salts thereof, and mixtures of the derivatives and the salts.A process for the preparation of these derivatives, salts, and mixtures and use of such derivatives, salts, and mixtures, especially in cosmetics. Compositions, especially cosmetic compositions, comprising the derivatives, salts, and mixtures.