CRYSTALLINITY, CRYSTALLITE SIZE, FINE STRUCTURAL AND PHYSICAL FIBRE PROPERTIES AT TWO FIBRE MATURITY LEVELS IN TWO EGYPTIAN COTTON CULTIVARS
Mar 13, 2017

Breeding & Genetic improvement Breeding-MedMiddleEast
Abstract                                                                         Back to Table of contents

Fibre maturity is an important characteristic of cotton. It affects the yield of lint as well as the quality of cotton fibre. Two ELS Egyptian cotton cultivars, Giza 45 and Giza 77, were used in this study at 65% and 80% fibre maturity levels. The crystalline characters were studied using a wide angle X-ray diffraction technique in their native state and after waxy substance extraction. The crystallinity percent of the fibres after waxy substance extraction at high maturity cotton were 80% and 81% for Giza 45 and Giza 77, respectively; they were 67% and 69% at low maturity.  Native cotton fibre gave a misleading value of 80% and 82% of crystallinity percent for high and low maturity levels of Giza 45, respectively. This result explains the importance of wax extraction during X-ray diffraction. Also, there was a high relationship between fibre maturity and degree of crystallinity after waxy substance extraction from the fibre sample. The crystallite size is almost the same for L002 this is about 3.5 nm for high and low maturity levels, respectively.

The cotton having higher fibre maturity had higher values of fibre strength at 1/8 or 0 inch gauge. number of convolutions per cm, and secondary wall width. The immature cotton had the higher values of waxy substances. Giza 45 was the higher in waxy substances and fibre elongation %, it had the lower ribbon width and diameter after swelling.  The present study points to the importance of incorporating fibre maturity in the marketing system.

Conclusion

There was a close relationship between crystallinity percent with fibre maturity, fibre strength at 1/8 or 0 inch gauge, number of convolutions per cm. and lumen width.  Giza 45 was the higher in waxy substances and fibre elongation %, it had the lower ribbon width and diameter after swelling. This study shows the importance of fibre maturity as a major fibre property, especially in marketing.

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