Journal of Polymer and Biopolymer Physics Chemistry
ISSN (Print): 2373-3403 ISSN (Online): 2373-3411 Website: http://www.sciepub.com/journal/jpbpc Editor-in-chief: Martin Alberto Masuelli
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Journal of Polymer and Biopolymer Physics Chemistry. 2014, 2(1), 12-24
DOI: 10.12691/jpbpc-2-1-3
Open AccessArticle

Physicochemical, Spectroscopic and Rheological Studies on Eucalyptus Citriodora (EC) Gum

Nnabuk Okon Eddy1, 2, , Inemesit Udofia1, Adamu Uzairu1, Anduang O. Odiongenyi2 and Clement Obadimu2

1Department of Chemistry, Ahmadu Bello University, Zaria, Kaduna State, Nigeria

2Department of Chemistry, Akwa Ibom State University, Ikot Akpaeden, Akwa Ibom State

Pub. Date: February 14, 2014

Cite this paper:
Nnabuk Okon Eddy, Inemesit Udofia, Adamu Uzairu, Anduang O. Odiongenyi and Clement Obadimu. Physicochemical, Spectroscopic and Rheological Studies on Eucalyptus Citriodora (EC) Gum. Journal of Polymer and Biopolymer Physics Chemistry. 2014; 2(1):12-24. doi: 10.12691/jpbpc-2-1-3

Abstract

Analysis of physicochemical properties of Eucalyptus citriodora gum revealed that the gum is mildly acidic, brownish in colour, ionic and has the potentials to swell four times its original volume. GCMS analysis of the gum indicated the presence of some carboxylic acids, pyran-4-one, 1,3-dioxolane, benzofuran and 1,2-ethanediyl acetate while analysis of its FTIR spectrum revealed functional groups that are common to polysaccharides. Scanning electron micrograph of the gum also revealed the existence of particle aggregations with some internal bridges within the system. Rheological properties of the gum were found to be affected by pH, concentration, temperature and by the presence of some electrolytes (KCl, CaCl2, AlCl3 and urea). Average value of intrinsic viscosity deduced from Huggins and Kraemer plots was 3.51 dL/g while the sum of their constants was 0.36 (i,e< 0.5 and suggested the absence of molecular association). Calculated value of the Power law constant was (b= 0.812) less than unity and pointed to a rod like conformation. From the Master’s curve, the existence of dilute and concentrated regimes, (corresponding to ηsp0α C1.04 (at C> C*) and ηsp0 α C0.95 (at C < C*) respectively) was established. Eucalyptus citriodora gum is a shear thinning, non-Newtonian polymer that is characterized by pseudoplastic behavior. The gum has some potentials for use as food additives and for other industrial applications.

Keywords:
Eucalyptus citriodora gum physicochemical parameters GCMS FTIR SEM rheology

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