Abstract: Ascorbic acid derivatives of the general formula 1: wherein R<1> is a C2-C22 acyl group, an amino acid group, or a C1-C17 alkyl group; R<2> is ammonium or a metal cation; and each of R<3> or R<4>, independently, is hydrogen, a C2-C22 acyl group, an amino acid residue, or a C1-C17 alkyl group, are more stable than ascorbic acid and can be used as a source of vitamin C in pharmaceutical, nutraceutical and cosmetic compositions.

Abstract: Novel derivatives of ascorbic acid and compositions comprising them are provided. The novel derivatives are of the following general formula (I): where R1 is a C2–C22 saturated or unsaturated fatty acid residues, amino acid residues, or a C1–C17 alkyl ; R2 is a group of the following formula (II) wherein R5 or R6 are the same or different and represent hydrogen, a C1–C4 alkyl, or R5 is C1–C4 alkyl group and R6 is a metal cation or ammonium cation; R3 or R4 are the same or different and represent hydrogen, C2–C22 saturated or unsaturated fatty acid residues, amino acid residues, or a C1–C17 alkyl.

Abstract: A method for microencapsulation of substances is provided. The substance(s) is/are dissolved or dispersed in an organic solvent of the kind that is partially miscible in water media. This organic solution is then mixed with an aqueous solution, which is saturated with an organic solvent and an emulsifier to form an emulsion. The emulsion is then poured into water under continuous agitation for the extraction of residual solvent. The formation of the solid capsules takes place during this extraction process. The capsules are undergone to further purification, whereby the microcapsules can be separated from the water and dried. By conditions of incubation of microcapsules in water-containing formulations the wall-softening process takes place. The unique system for controlled releasing the ingredients from microcapsules is based on the above-mentioned process.

Abstract: Novel derivatives of ascorbic acid and compositions comprising them are provided. The novel derivatives are of the following general formula (I): where R1 is a C2-C22 saturated or unsaturated fatty acid residues, amino acid residues, or a C1-C17 alkyl ; R2 is a group of the following formula (II) wherein R5 or R6 are the same or different and represent hydrogen, a C1-C4 alkyl, or R5 is C1-C4 alkyl group and R6 is a metal cation or ammonium cation; R3 or R4 are the same or different and represent hydrogen, C2-C22 saturated or unsaturated fatty acid residues, amino acid residues, or a C1-C17 alkyl.