Abstract: New compounds corresponding to formula (I) ##STR1## and their use as emulsifiers for aqueous emulsions and, in the case of carboxylic acid derivatives, also as reactive groups for linking to biologically active substrates. New polymers synthesized from the emulsifiers and other monomers are also claimed.

Abstract: The present invention discloses cationic lipids useful for making lipid aggregates for delivery of macromolecules and other compounds into cells. They are especially useful for the DNA-dependent transformation of cells. Also disclosed are lipids useful both for the delivery of macromolecules and also useful as intermediates for making other such lipids.

Abstract: The invention relates to compounds containing carbonate groups and carbonyl groups and having the general formula ##STR1## in which R stands for a C.sub.1 -C.sub.4 -alkyl radical, an aryl radical, or a radical R.sup.1, whereR.sup.1 has the following formula ##STR2## in which R.sup.2 to R.sup.6 stand for H, alkyl, OH, O-alkyl, SH, S-alkyl, halogen, N(alkyl).sub.2, or N(alkyl)(aryl) and at least one but not more than three of the radicals R.sup.2 to R.sup.6 stand for a radical of the formula ##STR3## in which A, B and C stand for alkylene, cycloalkylene, oxaalkylene, polyoxaalkylene or arylene, k and l both stand for an integer from 1 to 80, and the end group Z stands for alkyl, aryl, alkoxycarbonyl, alkoxycarbonyloxy, or aryl.These compounds are suitable for use as emulsifiers for dispersions.

Abstract: A peptide derivative amphiphatic compound or N-terminal salt thereof represented by formula (I): ##STR1## wherein R.sup.1 and R.sup.2 each represents a straight-chain or branched alkyl or acyl group having 8 to 24 carbon atoms optionally having a substituent or an unsaturated group; X represents --O--or --NH--; R.sup.3n and R.sup.3(n+1) each represents an .alpha.--amino acid side chain; n is an integer of from 0 to 5; the compound may be a racemic compound or an optically active compound when the compound has an asymmetric carbon atom; and the N-terminal salt of the compound optionally forms with an acid component; an intermediate thereof, a liposome comprising said peptide derivative amphiphatic compound and a film consisting of a monolayer or multilayers comprising the peptide derivative amphiphatic compound are disclosed.

Abstract: An amphipathic compound, which includes a succinic acid moiety and an amino acid moiety and is designed so as to form a stable unilayer liposome, and a negatively charged liposome comprising said amphipathic compound as a membrane-component are disclosed. The amphipathic compound of the present invention gives liposomes which minimize the leakage of a drug encapsulated therein and scarcely undergo association, aggregation or precipitation.

Abstract: Novel fat mimetic compositions are disclosed to be useful in reduced calorie foods. These compounds, which can be referred to as amide linked fat mimetics, consist of fragments bearing ester, ether, and/or amide groups joined by an aliphatic or alicyclic group through at least one amide linkage. These complex amide linked fat mimetics may be partially broken down in the body to produce digestion residues which are substantially nondigestible themselves and are sufficiently hydrophilic to enable the digestion residues to be incorporated in the normal stool. These fat mimetic compounds are useful as replacements for fats and oils for most food applications.

Abstract: Disclosed is an amino acid derivative represented by the general Formula (I): ##STR1## wherein R is a group whose conjugate acid has a pKa ranging from 10 to 16, R' is a straight chain alkyl group having 12 to 20 carbon atoms, n is an integer of 0 to 4, and X is --O--, --NH-- or --S--. These amino acid derivatives each having various eliminative groups can be synthesized by simple steps using optically active amino acids.

Abstract: The invention relates to glycerol derivatives of general formulae Ia, Ib and Ic ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, A and Y stand for various substituents, to a preparation process of said compounds and to therapeutical compositions containing the same.