01317naa a2200181 a 450000100080000000500110000800800410001910000180006024500630007826000090014152008240015065300190097465300150099365300120100870000200102070000250104077300700106510288092010-03-03       2004    bl ---       0--  u    #d1 aLAVALL, R. L.  aB-chitin from squid pensbextraction and characterization.  c2004  aChitin is a linear polymer formed predominantly by 2- acetamide-2-desoxi-D-glucopyrano units linked by O-glycosidic B(1-4) bonds [1]. It has an ordered structure and three crystalline forms (a, B and y). a- Chitin, the most common crystaltine structure, is a tightly compacted orthorhombic cell formed by altemating parallel and anti-.paraleI chains. B-Chitin has a monoclinic unity cell were the polysaccharide chains are parallel [1]. The a-chitin is the most abundant forro and it is commercially produced from crustacean shells, a raw material available in huge amounts from the fishery industries. Recently B chitin, the polymorph present in squid pens, has attraded a groing interest [2,3]. Indeed, the squid pen is also a cheap raw material and its chilin content is much higher than that of crustacean's shells.  aEspectroscopia  aPolímeros  aQuitina1 aASSIS, O. B. G.1 aCAMPANA-FILHO, S. P.  tIn: SIMPÓSIO IBEROAMERICANO DE QUTINA, 3. Córdoba, 2004. p. 78.