Analysis of retted and non retted flax fibres by chemical and enzymatic means

Mooney, Caitriona; Stolle-Smits, T.; Schols, Henk A.; Jong, Ed de

doi:10.1016/s0168-1656(01)00299-1

Cited by 68 publications

(46 citation statements)

References 16 publications

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“…These results agree with earlier studies of cotton and bamboo fibres [13,25], which showed that lignin, fatty acids, waxes and proteins, covered the cellulose in these fibres; the results also agree with studies that suggest that pectin is responsible for binding the cell wall layers together and is present in the middle lamella [27].…”

Section: Surface Compositionsupporting

confidence: 92%

Effect of humidity during manufacturing on the interfacial strength of non-pre-dried flax fibre/unsaturated polyester composites

Fuentes

Ting

Dupont‐Gillain

et al. 2016

Composites Part A: Applied Science and Manufacturing

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The influence of moisture content in the environment during manufacture of a novel cobalt-free UP matrix reinforced with flax fibres, on the fibre-matrix adhesion was studied. Flax surface energy was experimentally determined by measuring contact angles on technical fibres, using the Wilhelmy technique and the acid-base theory. The mechanical strength of the interface under different humidity conditions was characterized by the critical local value of interfacial shear stress, τ d , at the moment of crack initiation, which was assessed by single-fibre pull-out tests. Differential scanning calorimetry and x-ray photoelectron spectroscopy analysis gave further insight into the topic. The results suggest that the effect of humidity during manufacturing on the composite interface might be limited. However, longitudinal composite strength decreased somewhat for composites produced in humid conditions, showing that there is some detrimental effect of high levels of moisture during cure on the fibre mechanical performance, likely caused by some fibre degradation.

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Section: Surface Compositionsupporting

confidence: 92%

Effect of humidity during manufacturing on the interfacial strength of non-pre-dried flax fibre/unsaturated polyester composites

Fuentes

Ting

Dupont‐Gillain

et al. 2016

Composites Part A: Applied Science and Manufacturing

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“…It is also lower than the amount of uronic acid released in TFA § H 2 SO 4 , possibly due to a few pectins remaining associated with the cellulose microWbrils. These pectins might have been released by H 2 SO 4 as described for mature Xax Wbres by Mooney et al (2001). Pectins and particularly HGA were the most abundant in EB and EC (Table 5).…”

Section: Tissues Enriched In Secondary Wallsmentioning

confidence: 83%

Cadmium-induced alterations of the structural features of pectins in flax hypocotyl

Douchiche

Rihouey

Schaumann

et al. 2006

Planta

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In the course of our studies on the putative role of pectins in the control of cell growth, we have investigated the effect of cadmium on their composition, remodelling and distribution within the epidermis and fibre tissues of flax hypocotyl (Linum usitatissimum L.). Cadmium-stressed seedlings showed a significant inhibition of growth whereas the hypocotyl volume did not significantly change, due to the swelling of most tissues. The structural alterations consisted of significant increase of the thickness of all cell walls and the marked collapse of the sub-epidermal layer. The pectic epitopes recognized by the anti-PGA/RGI and JIM5 antibodies increased in the outer parts of the epidermis (external tangential wall and junctions) and fibres (primary wall and junctions). Concomitantly, there was a remarkable decrease of JIM7 antibody labelling and consequently an increase of the ratio JIM5/JIM7. Conversely, the ratio JIM7/JIM5 increased in the wall domains closest to the plasmalemma, which would expel the cadmium ions from the cytoplasm. The hydrolysis of cell walls revealed a cadmium-induced increase of uronic acid in the pectic matrix. Sequential extractions showed a remodelling of both homogalacturonan and rhamnogalacturonan I. In fractions enriched in primary walls, the main part of the pectins became cross-linked and could be extracted only with alkali. In fractions enriched in secondary walls, the homogalacturonan moieties were found more abundantly in the calcium-chelator extract while the rhamnogacturonan level increased in the boiling water extract.

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“…That's why, for instance, polygalacturonic acid (PGA) or rhamnogalacturonan I (RG I), described in numerous papers on plant fibers (e.g. [52][53][54][55] can not be attributed to a certain cell wall layer. The presence of polymers just in the G-layers must be additionally proved.…”

Section: Matrix Polysaccharides In Cellulosic Fibersmentioning

confidence: 99%