Single crystals of V-amylose complexed with alpha-naphthol.
Lamellar square single crystals of V-amylose were obtained by adding alpha-naphthol to metastable dilute aqueous solutions of synthetic amylose chains with an average degree of polymerization of 100. The morphology and structure of the crystals were studied using low-dose transmission electron microscopy including high-resolution imaging, as well as electron and X-ray diffraction. The crystals are crystallized in a tetragonal P4(1)2(1)2 or P4(3)2(1)2 space group with unit cell parameters, calculated from X-ray diffraction data, a = b = 2.2844 nm (+/-0.0005) and c = 0.7806 nm (+/-0.001), implying the presence of two amylose chains per unit cell. High-resolution lattice images of the crystals confirmed that the amylose chains were crystallized as 8-fold helices corresponding to the repeat of four maltosyl units.
Cardoso
Mateus B
MB
Centre de Recherches sur les Macromolécules Végétales (CERMAV-CNRS), BP 53, F-38041 Grenoble Cédex 9, France.
Putaux
Jean-Luc
JL
Nishiyama
Yoshiharu
Y
Helbert
William
W
Hÿtch
Martin
M
Silveira
Nádya P
NP
Chanzy
Henri
H
D000688:Amylose / Q000737:chemistry*; D003460:Crystallization; D009284:Naphthols / Q000737:chemistry*; D010316:Particle Size; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry*; D014961:X-Ray Diffraction
D009284:Naphthols; D011108:Polymers; C029350:1-naphthol; D000688:Amylose