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Vol. 8 (2005 year), No. 1

Novikov V.Yu., Chebotok E.N., Gizatulina G.A., Konovalova I.N.
Kinetic characteristics of chemical deacetylation of chitin and chitosan

The comparison of chemical hydrolysis of chitin and chitosan in acid and alkaline media has been carried out. It has been shown that the presence of the crystal structure in the investigated samples is not a reason of deceleration of the deacetylation process. Two parallel reactions can take place - deacetylation and buildup of slow-acting intermediate which has been destroyed during scour. The constants of velocities of reactions taking place at deacetylation have been calculated.

(in Russian, стр.4, fig. 6, tables. 0, ref 11, Adobe PDF, Adobe PDF 307 Kb)

Vol. 9 (2006 year), No. 4

Chebotok E.N., Novikov V.Yu., Konovalova I.N.
Influence of solvents character on kinetics of chitin and chitosan depolymerization

In the paper chitin and chitosan depolymerization in water, organic solvents and air in the presence of KI, NaI, NaCl, KOH and NaOH has been studied. It has been shown that alkali and salt do not influence on the kinetics of glycoside bonds' decomposition up to 15 days. The presence of chitin oxidative destruction has been proved as well.

(in Russian, стр.3, fig. 2, tables. 1, ref 8, Adobe PDF, Adobe PDF 194 Kb)

Vol. 10 (2007 year), No. 4

Novikov V.Yu., Chebotok E.N., Konovalova I.N.
Kinetics of alkaline hydrolysis of N-acetylglucosamine and D-glucosamine

The paper contains the results of tests of treating radioactive effluents of the civil atomic fleet by different materials in static states. The influence of solutions' composition on efficiency of radioactive nuclides' extraction has been studied. The influence of potassium and sodium content in the sorbent at ?R2Рћ = 5 % has also been investigated for the hardening mineral dispersion.

(in Russian, стр.4, fig. 3, tables. 2, ref 13, Adobe PDF, Adobe PDF 0 Kb)