Characterization and proprieties of cellulose isolated from the Crambe abyssinica hull

Gastaldi, G.; Capretti, G.; Focher, B.; Cosentino, Cesare

doi:10.1016/s0926-6690(98)00004-1

Cited by 53 publications

(36 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It shows a broad band at 3434 cm À1 , attributed to -OH stretching vibration and the one at 2923 cm À1 representing the aliphatic C-H stretching vibration. The band at 1636 cm À1 has been attributed to the -OH bending of adsorbed water [29][30][31]. This band shifted to 1645 cm À1 in the CELL:CHIT 5:5 spectrum, where the chitosan bands due to amide I and amine groups are possibly overlapping into this single band.…”

Section: Resultsmentioning

confidence: 98%

Mechanical properties of cellulose: chitosan blends for potential use as a coronary artery bypass graft

Azevedo

Retarekar

Raghavan

et al. 2012

Journal of Biomaterials Science, Polymer Edition

View full text Add to dashboard Cite

The development of intimal hyperplasia is the major cause of failure of both autologous saphenous vein and synthetic coronary artery bypass grafts. This is partially due to graft-host vessel compliance mismatch. Cellulose and chitosan (CELL:CHIT) are both biocompatible, nontoxic, and naturally occurring biopolymers that have been used extensively for biomedical applications. Elastic properties of membranes made of CELL:CHIT blends with different ratios between each polymer were determined using uniaxial tests and the ratio that yielded the less stiff membrane was chosen to prepare a small diameter hollow tube. The presence of chitosan had a favorable impact on the elasticity of the membranes, where the CELL:CHIT 5:5 ratio showed the lowest Young's modulus. Small diameter tubular constructs were fabricated using this optimal CELL:CHIT ratio and the compliance was determined on samples with different wall thickness and internal diameter. The compliance of the hollow tube with inner diameter of 4 mm and wall thickness of 1.2 mm was found to be 5.91%/mmHg×10(-2), which is higher than those of Dacron, expanded polytetrafluorethylene, and saphenous vein, but very close to that of human coronary artery. Burst strength tests revealed that the tubes can withstand at least 300 mmHg. Finally, the tubes showed satisfactory cell attachment property when myofibroblast cells adhered and proliferated on the lumen of the samples.

show abstract

Section: Resultsmentioning

confidence: 98%

Mechanical properties of cellulose: chitosan blends for potential use as a coronary artery bypass graft

Azevedo

Retarekar

Raghavan

et al. 2012

Journal of Biomaterials Science, Polymer Edition

View full text Add to dashboard Cite

show abstract

“…The disappearance of the band at 1,738 cm -1 revealed that alkaline treatment cleaved the ester bonds of hemicelluloses, such as acetyl and uronic-ester groups in all of the alkali-treated samples (Sun and Tomkinson, 2002). Two apparent bands were detected in the case of untreated substrates around 1,735 and 1,241 cm -1 attributable to C = O and C-O stretching vibrations at the acetyl ester unit of hemicelluloses (Owen and Thomas, 1989;Chen et al, 1997;Gastaldi et al, 1998;). However, a gradual diminishing of intensities in the two bands in both the hydrothermally and NaOH pretreated substrates was ascribed to the deacetylation with the removal of hemicelluloses.…”

Section: Ft-ir Analysismentioning

confidence: 96%

Evaluation and Selection of Potential Biomass Sources of North-East India towards Sustainable Bioethanol Production

et al. 2017

View full text Add to dashboard Cite

Vegetation biomass production in North-East India within Indo-Burma biodiversity hotspot is luxuriant and available from April to October to consider their potential for bioethanol production. Potential of six lignocellulosic biomass (LCB) sources; namely, sugarcane bagasse (BG), cassava aerial parts (CS), ficus fruits (Ficus cunia) (FF), "phumdi" (floating biomass), rice straw (RS), and sawdust were investigated for bioethanol production using standard techniques. Morphological and chemical changes were evaluated by Scanning electron microscopy and Fourier transform infrared spectroscopy and quantity of sugars and inhibitors in LCB were determined by High performance liquid chromatography. Hydrothermally treated BG, CS, and FF released 954.54, 1,354.33, and 1,347.94 mg/L glucose and 779.31, 612.27, and 1,570.11 mg/L of xylose, respectively. Inhibitors produced due to effect of hydrothermal pretreatment ranged from 42.8 to 145.78 mg/L acetic acid, below detection level (BDL) to 17.7 µg/L 5-hydroxymethylfurfural, and BDL to 56.78 µg/L furfural. The saccharification efficiency of hydrothermally treated LCB (1.35-28.64%) was significantly higher compared with their native counterparts (0.81-17.97%). Consolidated bioprocessing of the LCB using MTCC 1755 (Fusarium oxysporum) resulted in maximum ethanol concentration of 0.85 g/L and corresponded to 42 mg ethanol per gram of hydrothermally treated BG in 120 h followed by 0.83 g/L corresponding to 41.5 mg/g of untreated CS in 144 h. These ethanol concentrations corresponded to 23.43 and 21.54% of theoretical ethanol yield, respectively. LCB of CS and FF emerged as a suitable material to be subjected to test for enhanced ethanol production in future experiments through efficient fermentative microbial strains, appropriate enzyme loadings, and standardization of other fermentation parameters.

show abstract

“…In sugarcane bagasse (Figure 2A) and wheat straw ( Figure 2B), carbonyl band at 1740 cm -1 , ascribed to hemicellulose [20] was drastically reduced upon hydrolysis due to its breakdown [21]. The C=O stretching and aromatic vibration bands at 1640 cm -1 and at 1511 cm -1 [22] in wheat straw upon hydrolysis, were reduced, compared to raw material due to simultaneous release of lignin cross linked to hemicellulose.…”

Section: Atr-ftir Spectroscopic Analysismentioning

confidence: 98%

“…1500 to 1800 cm -1 . Results were interpreted by comparing with previous reported literature [19][20][21][22][23][24].…”

Section: Atr-ftir Analysismentioning

confidence: 99%

Bioconversion of Non-Detoxified Hemicellulose Hydrolysates to Xylitol by Halotolerant Yeast Debaryomyces nepalensis NCYC 3413

Paidimuddala¹

2014

J Microb Biochem Technol

View full text Add to dashboard Cite

Lignocellulosic materials are one of the most abundant renewable resources whose exploitation for the production of biochemicals and biofuels is the major challenge in the area of industrial biotechnology due to inhibition of growth and product formation by the toxic compounds released upon their hydrolysis. Indeed the bioprocess that can produce industrial products from hemicellulose hydrolysates in the presence of toxic compounds is economical than the process which involves detoxification. In this study, the ability of halotolerant strain Debaryomyces nepalensis NCYC 3413 to convert non-detoxified xylose enriched hemicellulose hydrolysates from corn cobs, rice straw, sugarcane bagasse and wheat straw to xylitol was evaluated. It was found that this strain has the capability to grow in all hemicellulose hydrolysates and convert xylose to xylitol without detoxification of hydrolysates. The maximum xylitol concentration of 14.6 g L -1 was obtained from corn cobs and wheat straw with productivities of 0.16 and 0.20 g L -1 h -1 respectively at a yield of 0.30 g g -1 . Whereas sugarcane bagasse and rice straw gave xylitol yields of 0.31 and 0.32 g g -1 respectively with 14.2 g L -1 maximum xylitol and productivities were calculated to be 0.20 and 0.15 g L -1 h -1respectively. The presence of high glucose hindered xylitol production by producing ethanol. Based on our findings, we suggest that (i) D. nepalensis is a promising strain for ecofriendly xylitol production as it exhibits broad specificity to lignocellulose substrates, fermentation of mixed sugars and (ii) tolerance towards lignocellulosic inhibitors making the process more economical.

show abstract

Characterization and proprieties of cellulose isolated from the Crambe abyssinica hull

Cited by 53 publications

References 10 publications

Mechanical properties of cellulose: chitosan blends for potential use as a coronary artery bypass graft

Mechanical properties of cellulose: chitosan blends for potential use as a coronary artery bypass graft

Evaluation and Selection of Potential Biomass Sources of North-East India towards Sustainable Bioethanol Production

Bioconversion of Non-Detoxified Hemicellulose Hydrolysates to Xylitol by Halotolerant Yeast Debaryomyces nepalensis NCYC 3413

Contact Info

Product

Resources

About