Abstract
With cotton fiber growth or maturation, cellulose content in cotton fibers markedly increases. Traditional chemical methods have been developed to determine cellulose content, but it is time-consuming and labor-intensive, mostly owing to the slow hydrolysis process of fiber cellulose components. As one approach, the attenuated total reflection Fourier transform infrared (ATR FT-IR) spectroscopy technique has also been utilized to monitor cotton cellulose formation, by implementing various spectral interpretation strategies of both multivariate principal component analysis (PCA) and 1-, 2- or 3-band/-variable intensity or intensity ratios. The main objective of this study was to compare the correlations between cellulose content determined by chemical analysis and ATR FT-IR spectral indices acquired by the reported procedures, among developmental Texas Marker-1 (TM-1) and immature fiber (im) mutant cotton fibers. It was observed that the R value, CIIR, and the integrated intensity of the 895 cm−1 band exhibited strong and linear relationships with cellulose content. The results have demonstrated the suitability and utility of ATR FT-IR spectroscopy, combined with a simple algorithm analysis, in assessing cotton fiber cellulose content, maturity, and crystallinity in a manner which is rapid, routine, and non-destructive.
Highlights
As one of the most important and widely grown crops in the world, cotton is a well-traded agricultural commodity primarily for its naturally produced textile fiber [1]
Fiber growth consists of four overlapping but distinctive phases: initiation, primary cell wall (PCW) formation for fiber elongation, secondary cell wall (SCW)
The fiber cells initiate at 0 days post anthesis” (DPA) and elongate to reach a fiber length of 22~35 mm within 20 to 25 DPA
Summary
As one of the most important and widely grown crops in the world, cotton is a well-traded agricultural commodity primarily for its naturally produced textile fiber [1]. Commercial cotton fibers are harvested from cotton plants. Cotton fibers are the dried cell walls of formerly living cells. They initiate from an ovary of the flower and grow into a mature seed-containing cotton boll within approximately 1.5~2 months. Fiber growth consists of four overlapping but distinctive phases: initiation, primary cell wall (PCW) formation for fiber elongation, secondary cell wall (SCW). The day of flowering is referred to as anthesis, and the term “days post anthesis” (DPA) is commonly used to describe the cotton fiber growth (Figure 1). The fiber cells initiate at 0 DPA and elongate to reach a fiber length of 22~35 mm within 20 to 25 DPA. The secondary cell wall synthesis starts around
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