+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on LinkedInFollow on LinkedIn

+ Translate

Molecular structure and dielectric properties studies of chitin and its treated by acid, base and hypochlorite

Molecular structure and dielectric properties studies of chitin and its treated by acid, base and hypochlorite

Carbohydrate polymers23 68(4): 728-733

In this work, the chitin was treated by 0.1 N HCl, 0.5 N NaOH, and 8% sodium hypochlorite. The change of the molecular structure was studied by Fourier Transform Infrared Spectroscopy (FTIR) in the wavenumber range (400-4000 cm-1). The absorption bands were assigned and the crystallinity index was calculated from the ratio of the absorbance C-N band at 1378 cm-1 and CH at 2925 cm-1. The data indicated that, the crystallinity index of chitin is higher than that of treated chitin which is due to the hydrolysis of some acetamide group. Also, treating with alkali causes a swelling of chitin chains. The dielectric properties such as dielectric constant (e'), dielectric loss (e") and AC electrical conductivity were measured and discussed as a function of frequencies (0.1 kHz-3 MHz). The dielectric constant (e') was decreased with increasing frequencies due to the dielectric dispersion. o-relaxation was observed and discussed from the dielectric loss (e"). The results of AC conductivity showed that, at high frequency, the conductivity increased with increasing frequencies and its interpreted in term of hopping conduction.

(PDF emailed within 0-6 h: $19.90)

Accession: 013763220

Download citation: RISBibTeXText

DOI: 10.1016/j.carbpol.2006.08.009

Related references

Molecular Structure and Physicochemical Properties of Acid-Methanol-Treated Chickpea Starch. International Journal of Food Properties 16(1): 125-138, 2013

Studies on the dielectric properties of wood. Effects of frequency, moisture content and temperature on the dielectric constant and dielectric loss factor. Bull. Kyushu Univ. For, 41, 109-68, 1967

The molecular and crystal structure of 6-methoxy-8-nitro-5(1H)-quinolone and its dielectric properties. Acta Crystallographica. Section B: Structural Crystallography and Crystal Chemistry 25(2): 362-368, 1969

Enantioselectivity in Ni(II) Schiff-base complexes derived from amino-acids and (S)-o-N-(N-benzylprolyl)aminobenzophenone: molecular structure of several chiral Ni(II) Schiff-base complexes, circular dichroism and molecular mechanics studies. Dalton Transactions: 2312-2321, 2005

Effect of base stacking on the acid-base properties of the adenine cation radical [A*+] in solution: ESR and DFT studies. Journal of the American Chemical Society 130(31): 10282-10292, 2008

The use of multiple probe molecules for the study of the acid-base properties of aluminium hydroxyfluoride having the hexagonal tungsten bronze structure: FTIR and [36Cl] radiotracer studies. Physical Chemistry Chemical Physics 11(9): 1369-1379, 2009

Density functional theory studies on molecular structure, vibrational spectra and electronic properties of cyanuric acid. Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy 138: 711-722, 2016

Optical properties and molecular structure of nucleic acids and their components. 1. Infrared spectra and molecular structure of cytidine and cytidylic acid in the solid phase at different pH values. Biofizika 7: 664-674, 1962

The estimation of the dielectric constant of rock specimens; studies on the dielectric properties of rocks; 2nd report. Nippon Kogyo Kaishi = Journal of the Mining and Metallurgical Institute of Japan 94(1083): 317-322, 1978

Studies on hyaluronic acid and related-substances III The determination of the structure of chitin by periodate oxidation. 1950

Curated Collections for Educators: Five Key Papers about Residents as Teachers Curriculum Development. Cureus 10(2): E2154-E2154, 2018

Comparison of molecular weight distribution and acid/ base properties between the IHSS Nordic fulvic acid and whole water humic substances. Science Of The Total Environment. 81-82: 307-314, 1989

Utilization of chitin prepared from the shellfish crust 1. functional properties of chitin chitosan and microcrystalline chitin. Journal of the Korean Fisheries Society 25(1): 45-50, 1992

Crystallization-based optical resolution of 1,1a-binaphthalene-2,2a-dicarboxylic acid via 1-phenylethylamides Control by the molecular structure and dielectric property of solvent. 2009

Molecular interaction study of the diisopropyl ether-propionic acid mixture by spectroscopic and dielectric studies. Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy 81(1): 172-177, 2012