Fine-granulometry fungal extract chitine-glucane
A fungal extract, chitin technology, applied in the field of chitin-glucan copolymer, can solve problems such as damage application
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[0115] The prior art discloses a number of porous materials related to the preparation of natural polymers such as chitosan or synthetic polymers such as polyurethane, PLA (polylactic acid), PGA (polyglycolic acid), PLGA (copolymer of lactic acid and glycolic acid), etc. literature. The prior art also discloses some documents related to the preparation of compositions enriched with fungal extracts comprising chitin or chitosan-glucan. However, there is no literature related to the preparation of cohesive porous solid materials from these fungal extracts. For example, patent RU2086247 discloses a composition comprising a chitosan-dextran complex obtained starting from the mycelium of a lower fungus (Aspergillus niger) for the purpose of preparing a flame retardant system. The preparation method comprises the steps of directly using biomass for washing and alkali treatment, followed by a freeze-drying step. However, this document does not mention products obtained in the form ...
Embodiment
[0168] Methods for obtaining the chitin-glucan copolymers obtained below are described in patent applications WO 03 / 068824 and FR 05.07066.
[0169] Example 'A' series: About chitin-dextran copolymer and its various controllable Preparation of Granular Granules
Embodiment A1
[0170] Example A1: Preparation of Chitin-Glucan Copolymer from Aspergillus niger Mycelia
[0171] A mass of 50 kg (dry weight) of wet Aspergillus niger mycelium was suspended in 0.5N hydrochloric acid solution, and then filtered. The solid material was then suspended in 1N sodium hydroxide solution and filtered. The solid material was washed 4 times with water, then filtered with a filter press and dried with a cone drier. It was then suspended in ethanol, then filtered and dried. About 15 kg of chitin-dextran were obtained (batch L25).
[0172] The molecular properties and compositions of the eight batches of chitin-dextran obtained according to this method are given in Table 1.
[0173] The chitin / dextran mass ratio was determined according to the method briefly described below by figure 1 Calculated from solid-phase C-13 nuclear magnetic resonance (NMR) spectra recorded under the conditions shown. The spectrum of chitin-dextran compound (batch L28) is as follows fi...
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