Abstract: The invention relates to per(3,6-anhydro)cyclodextrin derivatives containing in C2 at least one carbamate group, polymers thereof, their preparation and their use for separating contaminating anions such as the anions CrO42?, Cr2O72? or MnO42?.

Abstract: The invention concerns derivatives of per-(3,6-anhydro)-cyclodextrin, their preparation, and their use in separating polluting ions, for example in human decontamination. These derivatives correspond to one of the following formula: in which at least one of the R1 groups represents the group —OCH2COOH and the other R1 groups, which may be identical or different, represent a group that corresponds to one of the following formula: OH, OR2, SH, SR2, OCOR2, NH2, NHR2, NR2R3, CONH2, CONHR2, CONR2R3, CN, COOR2, COOH and R2, in which R2 and R3, which may be identical or different, represent an aliphatic or aromatic hydrocarbon group, either saturated or unsaturated, which may include one or several hetero-atoms comprising O, S and N, and n is equal to 6, 7 or 8.

Abstract: The invention relates to the fixation or separation of ions, particularly of Pb, by per(3,6-anhydro)cylcodextrin derivatives. This can be carried out by contacting the medium containing the ions to be fixed or separated, with a per(3,6-anhydro)cylcodextrin derivative of formula: in which at least one of the R1 represents OCH3, whilst the other R1 can represent OCH3, OH or other groups, for complexing the ions. Preferably, for the fixation of lead, the derivative complies with formula (I) with n=6 and all the R1=OCH3.

Abstract: The invention concerns derivatives of per-(3,6-anhydro)-cyclodextrin, their preparation and their use in separating polluting ions, for example in human decontamination.

Abstract: The invention relates to substituted derivatives of per(3,6-anhydro)cyclodextrins, their preparation process and their use for the separation of ions.These derivatives comply with one of the formulas: ##STR1## in which the R.sup.1, which can be the same or different, represent H, a halogen, OH, OR.sub.2, OM, SH, SR.sup.2, OCOR.sup.2, NH.sub.2, NR.sup.2 R.sup.3, CONR.sup.2 R.sup.3, CONH.sub.2, CN, COOR.sup.2, COOH, OSO.sub.2 R.sup.2, N.sub.3 or R.sup.2, and n=5, 6 or 7, provided that all the R.sup.1 do not represent OH.

Abstract: Conductive polymer doped by a sulphonated cyclodextrin salt and device for obtaining and/or supplying an active substance incorporating said polymer. The dopant used has the following formula (I): ##STR1## in which n is an integer between 2 and 50, M.sup.+ is Na.sup.+, Li.sup.+, K.sup.+ Mg.sup.+ 1/2 or NH.sub.4.sup.+ and R represents --SO.sub.3.sup.- M.sup.+ or --OH, whereby R can differ from one cycle to the other. The doped conductive polymer can be used as an active electrode material in an electrochemical device.

Abstract: An amphoteric starch containing carboxyl and cationic groups characterized in that its carboxyl groups originate from the selective oxidation of the hemiacetal groups of the cationic starch and possibly of the hemiacetal groups of its products of acid hydrolysis. The process for producing the amphoteric starch consists in reacting a cationic starch in aqueous solution with hydrogen peroxide and hydrobromic acid or bromine, so as to oxidize selectively the hemiacetal groups of the cationic starch and, where appropriate, the hemiacetal groups of its products of acid hydrolysis, to give carboxyl groups.

Abstract: This process consists in reacting a cationic starch in aqueous solution with hydrogen peroxide and hydrobromic acid or bromine, so as to oxidize selectively the hemiacetal groups of the cationic starch and, where appropriate, the hemiacetal groups of its products of acid hydrolysis, to give carboxyl groups. The amphoteric starch containing carboxyl and cationic groups, thus obtained, is characterized in that its carboxyl groups originate from the selective oxidation of the hemiacetal groups of the cationic starch and possibly of the hemiacetal groups of its products of acid hydrolysis.

Abstract: A process for preparing alkykl-1-thio-.alpha.,.beta.-glycosides and alkyl glycosides is described. The glycosides are prepared from a saccharide selected from monosaccharides and reducible di- and oligo-saccharides. The saccharide is reacted with either a thiol to produce an alkyl-1-thio-.alpha.,.beta.-glycoside or an alcohol to produce an alkyl glycoside in the presence of the solvent and reagent poly-(hydrogen fluoride)-pyridinium. Novel alkyl-1-thio-.alpha.,.beta.-glycosides prepared by the process of the invention are characterized in that they are in the form of a mixture of .alpha. and .beta. anomers. The alkyl-1-thio-.alpha.,.beta.-glycosides having a long alkyl chain are useful as nonionic detergents, in particular in the extraction of membrane proteins.

Abstract: The invention concerns a process for dehydrating glucides and applicable to those glucides of which the molecule includes at least one ketose type group, being characterized in that the glucide is made to react without addition of water with a hydrogen halide, whereupon the hydrogen halide is eliminated by evaporation in order to collect the formed disaccharide anhydride.The invention also relates to novel products characterized by essentially consisting of saccharide anhydrides of which the molecule includes two saccharide cycles linked to each other by two acetal bonds included in a dioxane cycle. As a rule at least one of the saccharide cycles is that of fructose (and may be substituted), and this cycle is linked by a spirane bond to the dioxane cycle.Product application as food additives.

Abstract: The invention concerns a process for dehydrating glucides and applicable to those glucides of which the molecule includes at least one ketose type group, being characterized in that the glucide is made to react without addition of water with a hydrogen halide, whereupon the hydrogen halide is eliminated by evaporation in order to collect the formed disaccharide anhydride.The invention also relates to novel products characterized by essentially consisting of saccharide anhydrides of which the molecule includes two saccharide cycles linked to each other by two acetal bonds included in a dioxane cycle. As a rule at least one of the saccharide cycles is that of fructose (and may be substituted), and this cycle is linked by a spirane bond to the dioxane cycle.Product application as food additives.