Abstract: A solid culture medium which is intended, in particular, for micro-organisms and eukaryotic cells. The medium includes, by way of a gelling base, a polysaccharide having a reproduction unit including a side chain and six neutral sugars, including glucose and galactose, and an acid sugar, pyruvate substituents and acetates being present. A solution in water or a saline solution having a concentration of the polysaccharide which is greater than or equal to 2 g/l forms an elastic transparent gel.

Abstract: Process for preparing a solubilization adjuvant, which comprises placing fusel oils in contact with one or more reducing sugars in the presence of an acid catalyst, at a temperature of between 50° C. and 130° C. and while removing the water from the reaction medium until a solution of alkyl glycosides is obtained, and separating the glycosides from this solution.

Abstract: The present invention relates to emulsions which remain perfectly stable over time, prepared from an emulsifier comprising at least one polyglycoside, i.e. polypentoside with or without pohexoside, in which the aliphatic radical has 16 to 18 carbon atoms, and at least one fatty alcohol having 12 to 22 carbon atoms; a process for stabilizing the emulsions; and an emulsifying agent.

Abstract: Process for preparing a solubilization adjuvant, which comprises placing fusel oils in contact with one or more reducing sugars in the presence of an acid catalyst, at a temperature of between 50° C. and 130° C. and while removing the water from the reaction medium until a solution of alkyl glycosides is obtained, and separating the glycosides from this solution.

Abstract: The invention concerns a polysaccharide with a repeat unit having a lateral chain and comprising six neutral sugars among which glucose and galactose and an acid sugar, a solution greater than 0.2% by weight of said polysaccharide forming a transparent and elastic gel. The invention is applicable in the cosmetic, food, pharmaceutical and oil industries.

Abstract: Process for preparing surfactant, which comprises contacting cane trash, maize by-products, sorghum by-products, barley by-products, rice by-products, fruits, chicory pulp, tubers or cynara for at least 5 seconds with a hydrolysing agent selected from an aqueous acid solution at between 20 and 150.degree. C. and an enzymatic hydrolysing composition of a plant material at between 20 and 90.degree. C. to obtain a sugar syrup, freeing the sugar syrup from any solid residues and contacting the residue-free sugar syrup with a C.sub.4-22 -alcohol at a temperature of between 20 and 150.degree. C., preferably between 30 and 110.degree. C., until a solution of surfactant glycosides is obtained, and separating the surfactant glycosides from this solution.

Abstract: This composition based on polyglycosides comprises 30 to 65% by weight of at least one fatty alcohol of formula ROH, where R is a staturated or unsaturated, straight-chained or branched aliphatic radical having 1 to 4 ethylenically unsaturated bonds and having 12 to 22 carbon atoms, the remainder being a mixture of polyglycosides containing 35 to 75% by weight, based on the polyglycosides, of polyhexosides.

Abstract: The galacturonic acid derivatives of formula: ##STR1## R1 being a linear or branched alkyl having 2 to 22 carbon atoms, R being: ##STR2## for which the carbon carrying the hydroxyl group is attached to the endocyclic oxygen atom.R2 being hydrogen, R1, an alkali metal atom, an alkaline-earth metal atom or a quaternary ammonium group of formula: ##STR3## in which R3 to R6 is each independently of the other hydrogen, an alkyl having 1 to 6 carbon atoms or a hydroxyalkyl having 1 to 6 carbon atoms, are surface-active agents.