Abstract

To achieve detection, monitoring, and automation of starch graft copolymerzation at any time, the investigation is being made according to luminescence of free radicals produced in the reaction. The investigations on the fluorescence spectra of starch-water suspension excited by ultraviolet (UV) light and its characteristics contribute to study the characteristics and mechanisms of free radicals coming into being, emitting, and disappearing. Fluorescence spectra of starch, dextrose, sucrose, and maltose excited by 260-nm light are compared and their similarities further verify that this fluorescence comes from the transition from nonbonding, namely n electrons in the hetero-atom (O) of the functional group (C-O-C) called ether linkage, to the antibonding orbital 'sigma'*. The functional group is a part of six-membered ring structure in starch molecule. Meanwhile, the experimental results indicate that relative peak intensity of fluorescence emitted by 1% starch suspension comes to climax when starch suspensions with different concentrations are excited by the same wavelength.

© 2005 Chinese Optics Letters

Effect of multiple light scattering and self-absorption on the fluorescence and excitation spectra of dyes in random media

S. A. Ahmed, Zhi-Wei Zang, K. M. Yoo, M. A. Ali, and R. R. Alfano
Appl. Opt. 33(13) 2746-2750 (1994)

Interferometric measurement of fluorescence excitation spectra

Joseph G. Hirschberg, György Vereb, Christoph K. Meyer, Achim K. Kirsch, Eli Kohen, and Thomas M. Jovin
Appl. Opt. 37(10) 1953-1957 (1998)

Measurement of 3-photon excitation and emission spectra and verification of Kasha’s rule for selected fluorescent proteins excited at the 1700-nm window

Xiangquan Deng, Ziwei Zhuang, Hongji Liu, Ping Qiu, and Ke Wang
Opt. Express 27(9) 12723-12731 (2019)

Absorption and excitation spectra of fluorescently brightened fabrics

M. G. King
Appl. Opt. 14(7) 1627-1631 (1975)

Multiple UV wavelength excitation and fluorescence of bioaerosols

Vasanthi Sivaprakasam, Alan L. Huston, Cathy Scotto, and Jay D. Eversole
Opt. Express 12(19) 4457-4466 (2004)