Abstract:
:The alpha chitin and chitosan used in the experiments came from crab shell waste (Sigma). This was treated to form a colloidal suspension of chitin or chitosan crystallites. The electrostatic 'charge coat' surrounding the chitin was then manipulated. This was achieved by alteration of the pH of the chitin or chitosan colloid (Chitin pKa = 6.1). This allowed the charge density on the crystalline rod of chitin or chitosan to be altered. The effect of this treatment was ascertained by measuring the diameter of spherulites formed in vitro. The results were analysed to see if the experimental optimal pH agreed with theoretical approximations. Further investigations were carried out on the initiation of the spherulites and the effect of temperature on spherulite formation. The spherulites form via self assembly through a liquid crystalline cholesteric phase. Manipulation of the electrostatic coat of the chitin could be a method of cellular remote control for formation of the helicoid in arthropod cuticle. This would allow the arthropods to set up conditions that aid the self assembly process.
journal_name
Int J Biol Macromoljournal_title
International journal of biological macromoleculesauthors
Murray SB,Neville ACdoi
10.1016/s0141-8130(98)00002-6subject
Has Abstractpub_date
1998-04-01 00:00:00pages
137-44issue
2eissn
0141-8130issn
1879-0003pii
S0141-8130(98)00002-6journal_volume
22pub_type
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