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Vol. 7 (2004 year), No. 3
Reut K.V., Beryoza I.G., Derkach S.P., Novikov V.Yu.
Non-waste technology of marine Crustacea testa processing
The industrial process of chitin extraction of Crustacea testa is connected with the formation of specific fluid wastes containing a great amount of protein compounds and mineral substances. The opportunity of protein compounds' precipitation out of technological discharges has been studied. The schematic circuit of sewage two-stage treating of chitin production has been proposed.
(in Russian, стр.4, fig. 2, tables. 3, ref 5, MS Word 95, MS Word 95 62 Kb)
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. 9 (2006 year), No. 5
Rysakova K.S., Novikov V.Yu., Mukhin V.A., Ovchinnikova S.I.
Research of chitinolythetic activity in digestive organs of hydroinvertebrates of the Barents Sea
The investigation results of phytoplankton photosynthetic pigments and species composition in the southern part of the Kola bay in the winter-vernal period have been presented. The maximal chlorophyll Р° concentration during hydrological winter in the surface layer reached 0.043 Вµg/l, in spring - 0.159 Вµg/l. In the bottom layer this index was 0.043 Вµg/l, in the vernal period - 0.119 Вµg/l. On the basis of chlorophyll Р° concentrations, pheophytin Р°, Margalef index and carotenoids/chlorophyll Р° ratio - the indices of the phytoplankton physiological state - during the observation period phytocenosis possessed low photosynthetic and production activity. Low abundance and biomass of micro-algae have corresponded to the conclusions. The active functional state of phytoplankton community during the Polar night and lack of typical for the Barents Sea coastal zone early-vernal micro-algae blossom peak in the southern part of the Kola bay have been explained by the development peculiarities of the estuary pelagic phytocenosis.
(in Russian, стр.6, fig. 6, tables. 3, ref 10, Adobe PDF, Adobe PDF 0 Kb)
Vol. 9 (2006 year), No. 5
Smirnova E.B., Mukhin V.A., Novikov V.Yu.
Temperature influence on activity of aquatic invertebrates' digestive proteinase
The paper considers the specific chitinolythetic activity of the marine hydroinvertebrates' enzymes and use of these enzymes for perfection of technology of chitinous substance reception from crustaceous' armours. Research of chitinolythetic activity of crustaceous and other marine organisms fermental systems has great value for studying biochemistry and organism physiological condition. The knowledge of chitinases is of great importance for technology of updating of chitin and chitosan for production of derivatives, in particular, Рѕligosaccharides, showing high pharmaceutical and biological activity
(in Russian, стр.2, fig. 1, tables. 0, ref 5, Adobe PDF, Adobe PDF 0 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)
Vol. 15 (2012 year), No. 1
Dolgopyatova N.V., Novikov V.Yu., Konovalova I.N., Shoshina E.V., Zotova K.V.
Improving the technology of glucosamine production from crabmeat chitin
The influence of preliminary acetylated chitin on output of D(+)-Glucosamine hydrochloride has been shown. Mechanism of chitin degradation and the mathematical model adequately describing this process have been proposed. The technology of glucosamine hydrochloride production from preliminary acetylated crab chitin has been improved.
(in Russian, стр.6, fig. 3, tables. 2, ref 13, Adobe PDF, Adobe PDF 0 Kb)
Vol. 15 (2012 year), No. 1
Zotova K.V., Kuchina Yu.A., Shironina A.Yu., Novikov V.Yu., Derkach S.R.
Influence of enzymic hydrolysis duration on properties of protein hydrolysates
Physicochemical properties of enzymic protein hydrolysates have been investigated. It has been found out that the viscosity of the hydrolysates is decreasing with increase of the hydrolysis time. Enzymic hydrolysis being conducted during 60 minutes results the accumulation of protein fractions with molecular weight about 100 kDa in the hydrolysate.
(in Russian, стр.5, fig. 5, tables. 0, ref 10, Adobe PDF, Adobe PDF 0 Kb)
Vol. 15 (2012 year), No. 1
Kuchina Yu.A., Dolgopyatova N.V., Novikov V.Yu., Sagaidachny V.A., Morozov N.N.
Instrumental methods of determining the degree of chitin deacetylation
The overview of methods for determination the chitin and chitosan deacetylation degree has been carried out. The optical density of chitosan samples with different molecular weight in the infrared has been defined. The comparative results of measuring chitin deacetylation degree by the method of infrared spectroscopy and using registration of chitin acid hydrolysis product by the liquid chromatography method have been given.
(in Russian, стр.7, fig. 6, tables. 2, ref 16, Adobe PDF, Adobe PDF 0 Kb)
Vol. 15 (2012 year), No. 1
Portsel M.N., Novikov V.Yu., Konovalova I.N., Putintsev N.M., Shoshina E.V.
Application of ultrafiltration process for purification of chondroitin sulfate extracted from marine hydrobionts
The technology of purification of the chondroitin sulfate from low molecular weight protein contaminants using ultrafiltration process has been worked out. Using polyelectrolyte swelling effect in a solution of chondroitin sulfate, and the separation of contaminants on the membranes makes it possible to obtain demineralized polysaccharide with a given range of molecular weight and a high degree of purification from protein and amino acids impurities.
(in Russian, стр.4, fig. 2, tables. 2, ref 11, Adobe PDF, Adobe PDF 0 Kb)
Vol. 16 (2013 year), No. 3
Reut K.V., Dolgopyatova N.V., Novikov V.Yu., Putintsev N.M., Konovalova I.N., Kuchina Yu.A.
Optical activity and spectrophotometric characteristics of chitosan solutions obtained from the Kamchatka crab and the Arctic shrimp
The size of specific optical rotation of chitosan solutions has been shown to depend on nucleophilicity of hydrolyzing agent, it grows in absolute value with increase of quantities of trailer glycosidic centers in chitosan solution; the chitosan deacetylation degree practically does not influence on the size of specific optical rotation. For chitosan from chitin of the Kamchatka crab and the Arctic shrimp identical laws of influence of molecular weight and deacetylation degree on the size of specific optical rotation have been obtained. Influence of phosphoric acid on conformational transformations trailer glycosidic centres of chitosan molecules has been defined.
(in Russian, стр.6, fig. 6, tables. 2, ref 12, Adobe PDF, Adobe PDF 0 Kb)