| Literature DB >> 26504621 |
Richard Cisek1, Danielle Tokarz1, Martin Steup2, Ian J Tetlow3, Michael J Emes3, Kim H Hebelstrup4, Andreas Blennow5, Virginijus Barzda1.
Abstract
Second harmonic generation (SHG) microscopy is employed to study changes in crystalline organization due to altered gene expression and hydration in barley starch granules. SHG intensity and susceptibility ratio values (R'SHG ) are obtained using reduced Stokes-Mueller polarimetric microscopy. The maximum R'SHG values occur at moderate moisture indicating the narrowest orientation distribution of nonlinear dipoles from the cylindrical axis of glucan helices. The maximum SHG intensity occurs at the highest moisture and amylopectin content. These results support the hypothesis that SHG is caused by ordered hydrogen and hydroxyl bond networks which increase with hydration of starch granules.Entities:
Keywords: (170.3880) Medical and biological imaging; (170.4580) Optical diagnostics for medicine
Year: 2015 PMID: 26504621 PMCID: PMC4605030 DOI: 10.1364/BOE.6.003694
Source DB: PubMed Journal: Biomed Opt Express ISSN: 2156-7085 Impact factor: 3.732