Relation of certain infrared bands to cellulose crystallinity and crystal lattice type. Part II. A new infrared ratio for estimation of crystallinity in celluloses I and II

Nelson, Mary L.; O’Connor, Robert T.

doi:10.1002/app.1964.070080323

Cited by 850 publications

(438 citation statements)

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“…This is similar to the change in structure of sugarcane bagasse after dilute sulfuric acid pretreatment with microwave heating and the structure of OPEFB after fungal pretreatment followed by phosphoric acid pretreatment [23,31]. Nelson & Connor [32] proposed a crystallinity index called LOI, which is obtained by calculating the ratio between the absorption bands at 1429 and 893 cm -1 . In this study, the peaks at 1423 cm -1 and 902 cm -1 were more pronounced with increasing temperature, even though the LOI values of the untreated and the treated OPEFB were not different (Table 3).…”

Section: Effect Of Pretreatment On the Functional Groups Of Opefb Fiberssupporting

confidence: 52%

Disruption of Oil Palm Empty Fruit Bunches by Microwave-assisted Oxalic Acid Pretreatment

Solihat

Sari

Risanto

et al. 2017

J. Math. Fund. Sci.

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Abstract. Developing an effective pretreatment for the conversion of lignocellulosic biomass to ethanol is an important effort in reducing the cost of this process. Microwave-assisted pretreatment is considered a green technology that can effectively break down lignocellulosic structures. The objective of this study was to investigate the most effective temperature for microwave-assisted oxalic acid pretreatment regarding the structural characteristic changes of oil palm empty fruit bunches (OPEFB) fibers. The fibers were subjected to microwave-assisted oxalic acid pretreatment at 160-200 °C with 2.5 minutes heating time and a liquid to solid ratio of 10. The effectiveness of the pretreatment was determined based on its delignification selectivity, morphological characteristics, and functional group changes. Microwave irradiation of OPEFB fibers at 180 ºC was effective in increasing the cellulose content by 24%. This pretreatment resulted in 1.82 delignification selectivity. More than 50% of the hemicellulose of the OPEFB was removed after this treatment, which was confirmed by a decrease of the absorption bands of functional groups at 1732 cm -1 . The increase of pretreatment temperature disrupted the morphological structure of the OPEFB and removed its hemicellulose but did not change its functional groups and lignin content.

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Section: Effect Of Pretreatment On the Functional Groups Of Opefb Fiberssupporting

confidence: 52%

Disruption of Oil Palm Empty Fruit Bunches by Microwave-assisted Oxalic Acid Pretreatment

Solihat

Sari

Risanto

et al. 2017

J. Math. Fund. Sci.

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“…The 1,437-cm −1 band is for CH 2 scissoring motion, and 899 cm −1 band (equivalent to 897 cm −1 absorbance) is for vibrational mode involving C1 and four atoms attached to it, which is characteristic of β-anomers or β-linked glucose polymers (Nelson and O'Connor 1964); the 1,378-cm −1 band is for C-H bending mode, and the 2,900-cm −1 band is for C-H and CH 2 stretching, which is unaffected by changes in crystallinity (Nelson and O'Connor 1964). From these spectra, two infrared ratios were calculated: (1) α 1437 cm , which is known as the total crystallinity index (TCI) (Nelson and O'Connor 1964). The higher index value represents that the material has a higher crystallinity and ordered structure.…”

Section: P T R E a T E D [ E M I M ] D E P T R E A T E D D M E A A Tmentioning

confidence: 99%

Evaluation of the biocompatibile ionic liquid 1-methyl-3-methylimidazolium dimethylphosphite pretreatment of corn cob for improved saccharification

Jiang

et al. 2010

Appl Microbiol Biotechnol

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Ionic liquid (IL) pretreatment of lignocellulose materials is a promising process in biomass conversion to renewable biofuel. More in-depth research involving environment-friendly IL is much needed to explore pretreatment green route. In our case, IL 1-methyl-3-methylimidazolium dimethylphosphite ([Mmim]DMP) was chosen as an environment-friendly solvent to pretreat corn cob in view of its biocompatibility with both lignocellulose solubility and cellulase activity. The pretreatment/saccharification process and in situ saccharification process involving [Mmim]DMP were efficiently performed in bioconversion of corn cob to sugars, and more than 70% saccharification rates were obtained. Furthermore, the fermentability of reducing sugars obtained from the hydrolyzates was evaluated using Rhodococcus opacus strain ACCC41043 (R. opacus). High lipid production 41-43% of cell dry matter was obtained after 30 h of cultivation. GC/ MS analysis indicated that lipids from R. opacus contained mainly long-chain fatty acids with four major constituent/ oleic acid, stearic acid, palmitic acid, palmitoleic acid which are good candidates for biodiesel. These elucidated that corn cob pretreated by IL [Mmim]DMP did not bring negative effects on saccharification, cell growth, and accumulation of lipid of R. opacus. In conclusion, the IL [Mmim]DMP shows promise as green pretreatment solvent for cellulosic materials.

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“…O outro método adotado para a determinação do índice de cristalinidade baseou-se na espectroscopia de infravermelho, proposto por Nelson & O'Connor (1964b), utilizando a razão entre a absorbância 1372 cm" (C-H angular) e a absorbância 2900 cm" 1 (C-H axial).…”

Section: Methodsunclassified

Determinação dos índices de cristalinidade de fibras celulósicas

et al. 1994

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No presente estudo, foi avaliada a introdução de métodos de análises de micro-estrutura de fibras celulósicas. O algodão utilizado, proveniente das variedades IAC 17, IAC 19 e IAC 20, foi colhido em dez localidades do ensaio regional de variedades do Estado de São Paulo, no ano agrícola de 1985/86. Amostras de fibras de viscose, rami e rami tratado quimicamente com ácido clorídrico, também foram usadas, a fim de estabelecer uma relação entre os dois sistemas de determinação dos índices de cristalinidade. Utilizaram-se os métodos empíricos de difratometria de raios X e espectroscopia de infravermelho para as determinações dos índices de cristalinidade: o obtido por espectroscopia de infravermelho permitiu a diferenciação de variedades de algodoeiro IAC, enquanto o proposto por difratometria de raios X não possibilitou essa diferença. As propriedades físicas das fibras de variedades de algodoeiro IAC não se correlacionaram com os índices de cristalinidade obtidos nos dois processos. Os métodos usados para a determinação de tais índices foram altamente correlacionados (r = 0,95), empregando-se amostras de celulose com tratamento diferenciado.

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Relation of certain infrared bands to cellulose crystallinity and crystal lattice type. Part II. A new infrared ratio for estimation of crystallinity in celluloses I and II

Cited by 850 publications

References 0 publications

Disruption of Oil Palm Empty Fruit Bunches by Microwave-assisted Oxalic Acid Pretreatment

Disruption of Oil Palm Empty Fruit Bunches by Microwave-assisted Oxalic Acid Pretreatment

Evaluation of the biocompatibile ionic liquid 1-methyl-3-methylimidazolium dimethylphosphite pretreatment of corn cob for improved saccharification

Determinação dos índices de cristalinidade de fibras celulósicas

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