Electron diffraction technique for the determination of cellulose crystallinity

Paralikar, K. M.; Betrabet, S. M.

doi:10.1002/app.1977.070210402

Cited by 20 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The patterns indicate very high orientation of cellulose crystals in the fibres. They are similar to that of jute fibres (Lin et al 2014), ramie fibre (Woodcock & Sarko 1980) and also electron diffraction patterns of ramie (French 1978) and cotton microfibrils (Herbert & Muller 1974;Paralikar & Betrabet 1977) suggesting that the cellulose in PALF is of type 1 (Cellulose I). This is characterized by the three diffractions assigned (110), (200), and (004).…”

Section: Waxs Analysis Of Fibre Bundles and Microfibressupporting

confidence: 68%

Revisiting the Morphology, Microstructure, and Properties of Cellulose Fiber from Pineapple Leaf so as to Expand Its Utilization

Surajarusarn¹,

Traiperm²,

Amornsakchai³

2019

JSM

View full text Add to dashboard Cite

Pineapple leaf waste is an agricultural product that is available in large quantities and is still under-utilized. Therefore, the aim of this work was to investigate the morphology, microstructure, and mechanical properties of pineapple leaf fibre (PALF) such that its full potential may be realized. Pineapple leaf, its fibre bundles and elementary fibres have been investigated. Morphology, size, and mechanical properties of fibre bundles extracted from different parts (i.e. bottom, middle and top) of a leaf were studied. It was found that the PALF obtained from vascular tissue and from the mesophyll have different macroscopic shapes. Both, however, contain micron-size elementary fibres of similar size and shape. Size and properties of fibre bundles change from the bottom end of a leaf toward the top end. Pineapple leaf microfibre (PALMF) was found to be smaller in diameter than other natural fibres. It is also very long and its structure changes according to its position along the leaf. At the bottom end a clear and large central hole or lumen can be observed. At the top the lumen becomes almost undetectable. The mechanical strength of PALMF appears to decrease, albeit very slightly, toward the tip of the leaf. The mechanical properties of the fibres are relatively high and comparable to that of flax and hemp fibres which are widely studied and used as reinforcing materials in composites. Very long microfibre can easily be obtained from fibre bundles by dissolving the binding matrix. Potential applications for this microfibre are suggested.

show abstract

Section: Waxs Analysis Of Fibre Bundles and Microfibressupporting

confidence: 68%

Revisiting the Morphology, Microstructure, and Properties of Cellulose Fiber from Pineapple Leaf so as to Expand Its Utilization

Surajarusarn¹,

Traiperm²,

Amornsakchai³

2019

JSM

View full text Add to dashboard Cite

show abstract

“…The electron diffraction (ED) patterns from these crystals were recorded using the method described earlier. 17 The d spacings of the reflections were measured.…”

Section: Methodsmentioning

confidence: 99%

Crystallization of cellulose

Paralikar

Aravindanath

1988

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…The cellulase blends from P. funiculosum and T. harzianum were concentrated as described in Section 2. amorphous part of the cellulose would be depolymerized first, which increases the crystallinity of the cellulose during enzymatic hydrolysis [26,27]. However, several research groups have found that crystallinity does not increase during enzymatic hydrolysis [28][29][30][31].…”

Section: Crystallinity Of Lignocellulose Samplesmentioning

confidence: 99%

Enzymatic hydrolysis of pretreated sugar cane bagasse using Penicillium funiculosum and Trichoderma harzianum cellulases

Maeda

Serpa

Rocha

et al. 2011

Process Biochemistry

159

View full text Add to dashboard Cite

a b s t r a c tIn this study, we investigated the enzymatic hydrolysis of pretreated sugarcane bagasse using eight different enzymatic blends obtained from concentrated crude enzyme extracts produced by Penicillium funiculosum and Trichoderma harzianum as well as from the extracts in combination with a commercial enzymatic cocktail. The influence of different levels of biomass delignification, degree of crystallinity of lignicellulose, composition of enzymatic activities and BSA on enzymatic hydrolysis yields (HYs) was evaluated. Our X-ray diffraction studies showed that crystallinity of lignocellulose is not a key determinant of its recalcitrance toward enzymatic hydrolysis. In fact, under the experimental conditions of our study, an increase in crystallinity of lignocellulosic samples resulted in increased glucose release by enzymatic hydrolysis. Furthermore, under the same conditions, the addition of BSA had no significant effect on enzymatic hydrolysis. The most efficient enzyme blends were obtained by mixing a commercial enzymatic cocktail with P. funiculosum or T. harzianum cellulase preparations (HYs above 97%) followed by the concentrated extract of P. funiculosum alone (HY = 88.5%). Increased hydrolytic efficiencies appeared to correlate with having an adequate level of both ␤-glucosidase and xylanase activities in the blends.

show abstract

Electron diffraction technique for the determination of cellulose crystallinity

Cited by 20 publications

References 0 publications

Revisiting the Morphology, Microstructure, and Properties of Cellulose Fiber from Pineapple Leaf so as to Expand Its Utilization

Revisiting the Morphology, Microstructure, and Properties of Cellulose Fiber from Pineapple Leaf so as to Expand Its Utilization

Crystallization of cellulose

Enzymatic hydrolysis of pretreated sugar cane bagasse using Penicillium funiculosum and Trichoderma harzianum cellulases

Contact Info

Product

Resources

About