Process for preparing chitosan particles

Details Process for preparing chitosan particles Process for preparing chitosan particles

C - Chemistry, Metallurgy

08

B

C08B 37/08 (2006.01) A01N 25/04 (2006.01) A01N 43/16 (2006.01) C08J 3/07 (2006.01) C08J 3/14 (2006.01) C08L 5/08 (2006.01)

Patent

CA 2407584

Disclosed is a process for producing particles of the modified carbohydrate polymer chitosan. Such chitosan particles are "activated" as a consequence of the specific steps used in the process. The process involves precipitation of dissolved chitosan from an acid solution thereof by the step-wise addition of neutralizing agent to the solution. A partial neutralization is carried out under shear agitation to form a continuous gel phase having a pH within the range of 5.0 to 6.9. This partially neutralized chitosan gel phase is then further subjected to shear agitation for at least 10 seconds to homogenize the gel phase. The homogenized gel phase is then further neutralized under shear agitation to a pH of above 6.9 to form a gel-like suspension of discrete chitosan particles. Chitosan particles in this form are useful in a number of contexts including, in particular, in the area of plant care.

Cette invention concerne un procédé de fabrication de particules de polymère carbohydrate chitosane modifié. De telles particules de chitosane se trouvent "activées" à la suite d'opérations spécifiques intervenant dans ledit procédé. Ce procédé consiste à précipiter du chitosane dissous à partir d'une solution acide par adjonction progressive d'un agent neutralisant dans la solution. Une neutralisation partielle obtenue par agitation à cisaillement permet d'obtenir une phase de gel continue dont le pH se situe entre 5,0 et 6,9. Cette phase de gel de chitosane partiellement neutralisée est ensuite soumise à une nouvelle agitation à cisaillement pendant au moins 10 secondes de manière à homogénéiser la phase de gel. La neutralisation de cette phase de gel homogénéisée se poursuit en conditions d'agitation à cisaillement pour porter le pH au-dessus de 6,9 et former une suspension de type gel de particules de chitosane séparées. Sous cette forme, les particules de chitosane se prêtent à diverses applications, en particulier dans le domaine phytosanitaire.

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