scholarly journals Efficient Extraction and Structural Characterization of Hemicellulose from Sugarcane Bagasse Pith

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 608 ◽  
Author(s):  
Yitong Xie ◽  
Xin Guo ◽  
Zhiyu Ma ◽  
Jingwei Gong ◽  
Haisong Wang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Sugarcane Bagasse ◽  
Average Molecular Weight ◽  
Water Soluble ◽  
Surface Model ◽  
Extraction Temperature ◽  
Alkaline Extraction ◽  
Ultrasound Assisted ◽  
Bagasse Pith ◽  
Sugarcane Bagasse Pith

The aim of this study was to investigate the ultrasound-assisted alkaline extraction process and structural properties of hemicellulose from sugarcane bagasse pith. Response surface model (RSM) was established in order to optimize the extraction conditions for the highest hemicellulose yield based on the single-factor experiments. A maximum total hemicellulose yield of 23.05% was obtained under the optimal conditions of ultrasonic treatment time of 28 min, KOH mass concentration of 3.7%, and extraction temperature of 53 °C, and it evidently increased 3.24% compared without ultrasound-assisted extraction. The obtained hemicellulose was analyzed by Fourier transform infrared (FT-IR) spectroscopy. The monosaccharide composition and average molecular weight of hemicellulose were characterized by using ion chromatography (IC) and gel permeation chromatography (GPC). The results indicated that xylose was dominant component in water-soluble hemicellulose (WH, 69.05%) and alkali-soluble hemicellulose (AH, 85.83%), respectively. Furthermore, the monosaccharides (otherwise xylose) and uronic acids contents of WH were higher than that of AH. Weight average molecular weight of WH was 29923 g/mol, lower than that of AH (74,872 g/mol). These results indicate that ultrasonic-assisted alkaline extraction is an efficient approach for the separation of hemicellulose from sugarcane bagasse pith.

A STUDY OF A WATER-SOLUBLE COMPLEX OF PRODIGIOSIN PRODUCED BY A STRAIN OF SERRATIA MARCESCENS

1962 ◽  
Vol 40 (1) ◽  
pp. 1019-1024 ◽  
Author(s):  
Seiichi Yoshida
Keyword(s):  
Molecular Weight ◽  
Light Scattering ◽  
Serratia Marcescens ◽  
Average Molecular Weight ◽  
Electrophoretic Analysis ◽  
Water Soluble ◽  
Soluble Complex ◽  
Ph Values ◽  
Scattering Measurements ◽  
Water Soluble Complex

A water-soluble pigment excreted from Serratia marcescens has been purified by precipitation with ammonium sulphate, dialysis, and ultracentrifugation at different pH values. The purified pigment showed a single band in the ultracentrifuge and by electrophoretic analysis at several pH values. An average molecular weight of 5 × 106 was calculated from light-scattering measurements. This pigment is composed of carbohydrate and protein combined with prodigiosin, and several properties of the complex are described.

The localization and activity of Cellulomonas xylanase on sugarcane bagasse pith

1985 ◽  
Vol 31 (8) ◽  
pp. 754-756 ◽  
Author(s):  
H. Rodríguez ◽  
A. Enríquez ◽  
O. Volfová
Keyword(s):  
Sugarcane Bagasse ◽  
Growth Phase ◽  
Xylanase Activity ◽  
Rapid Degradation ◽  
Second Growth ◽  
Hemicellulose Degradation ◽  
Bagasse Pith ◽  
Sugarcane Bagasse Pith

Xylanase activity was found both free and bound to the cells and (or) the substrate during the first growth phase of Cellulomonas on bagasse pith. At the same time, rapid degradation of the bagasse hemicellulose was observed. The enzymes became bound mainly during the second growth phase, during which hemicellulose degradation was still detected, although at a lower rate. Intracellular xylanase activity was about one-tenth of the activity detected outside the cell during this phase. At the end of growth, 89% of the bagasse hemicellulose had been consumed.

Removal of phenanthrene from soil by co-cultures of bacteria and fungi pregrown on sugarcane bagasse pith

2003 ◽  
Vol 89 (2) ◽  
pp. 177-183 ◽  
Author(s):  
B Chávez-Gómez ◽  
R Quintero ◽  
F Esparza-Garcı́a ◽  
A.M Mesta-Howard ◽  
F.J Zavala Dı́az de la Serna ◽  
...  
Keyword(s):  
Sugarcane Bagasse ◽  
Bagasse Pith ◽  
Bacteria And Fungi ◽  
Sugarcane Bagasse Pith

A STUDY OF A WATER-SOLUBLE COMPLEX OF PRODIGIOSIN PRODUCED BY A STRAIN OF SERRATIA MARCESCENS

1962 ◽  
Vol 40 (8) ◽  
pp. 1019-1024 ◽  
Author(s):  
Seiichi Yoshida
Keyword(s):  
Molecular Weight ◽  
Light Scattering ◽  
Serratia Marcescens ◽  
Average Molecular Weight ◽  
Electrophoretic Analysis ◽  
Water Soluble ◽  
Soluble Complex ◽  
Ph Values ◽  
Scattering Measurements ◽  
Water Soluble Complex

A water-soluble pigment excreted from Serratia marcescens has been purified by precipitation with ammonium sulphate, dialysis, and ultracentrifugation at different pH values. The purified pigment showed a single band in the ultracentrifuge and by electrophoretic analysis at several pH values. An average molecular weight of 5 × 106 was calculated from light-scattering measurements. This pigment is composed of carbohydrate and protein combined with prodigiosin, and several properties of the complex are described.

Hydrolysis behaviors of sugarcane bagasse pith in subcritical carbon dioxide–water

RSC Advances ◽  
2016 ◽  
Vol 6 (101) ◽  
pp. 99322-99330 ◽  
Author(s):  
Jiezhen Liang ◽  
Xiaopeng Chen ◽  
Linlin Wang ◽  
Xiaojie Wei ◽  
Feifei Qiu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Sugarcane Bagasse ◽  
High Capacity ◽  
Bagasse Pith ◽  
Hydrolysis Of ◽  
Sugarcane Bagasse Pith

Subcritical CO2–water exhibits a high capacity for dissolution and catalysis to promote the hydrolysis of sugarcane bagasse pith.

scholarly journals Cloud Condensation Nuclei properties of model and atmospheric HULIS

2006 ◽  
Vol 6 (9) ◽  
pp. 2465-2482 ◽  
Author(s):  
E. Dinar ◽  
I. Taraniuk ◽  
E. R. Graber ◽  
S. Katsman ◽  
T. Moise ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Fulvic Acid ◽  
Atmospheric Aerosols ◽  
Cloud Condensation Nuclei ◽  
Average Molecular Weight ◽  
Water Soluble ◽  
Cloud Droplets ◽  
Secondary Sources ◽  
Multifunctional Compounds ◽  
Physico Chemical

Abstract. Humic like substances (HULIS) have been identified as a major fraction of the organic component of atmospheric aerosols. These large multifunctional compounds of both primary and secondary sources are surface active and water soluble. Hence, it is expected that they could affect activation of organic aerosols into cloud droplets. We have compared the activation of aerosols containing atmospheric HULIS extracted from fresh, aged and pollution particles to activation of size fractionated fulvic acid from an aquatic source (Suwannee River Fulvic Acid), and correlated it to the estimated molecular weight and measured surface tension. A correlation was found between CCN-activation diameter of SRFA fractions and number average molecular weight of the fraction. The lower molecular weight fractions activated at lower critical diameters, which is explained by the greater number of solute species in the droplet with decreasing molecular weight. The three aerosol-extracted HULIS samples activated at lower diameters than any of the size-fractionated or bulk SRFA. The Köhler model was found to account for activation diameters, provided that accurate physico-chemical parameters are known.

VEGETABLE IVORY AS A SOURCE OF A MANNAN POLYSACCHARIDE

1957 ◽  
Vol 35 (4) ◽  
pp. 333-338 ◽  
Author(s):  
T. E. Timell
Keyword(s):  
Molecular Weight ◽  
Copper Complex ◽  
Average Molecular Weight ◽  
Alkaline Extraction ◽  
Vegetable Ivory

Native vegetable ivory has been found to contain in addition to the mannose also glucose residues together with minor amounts of galactose, arabinose, xylose, and rhamnose units. No pectin could be detected. The native material was very non-uniform and was composed of two major portions (mannans A and B) which differed considerably in their average molecular weight and polymolecularity. Alkaline extraction of the untreated product followed by purification via the copper complex offers the best means for obtaining a pure mannan polysaccharide.

scholarly journals Polysaccharides fromTrichosanthes Fructusvia Ultrasound-Assisted Enzymatic Extraction Using Response Surface Methodology

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Fujia Chen ◽  
Dahong Li ◽  
Hongqi Shen ◽  
Chunhong Wang ◽  
Enzhong Li ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Response Surface ◽  
Average Molecular Weight ◽  
Reducing Power ◽  
Extraction Temperature ◽  
Antitumor Activities ◽  
Enzymatic Extraction ◽  
Solid Ratio ◽  
Natural Medicine ◽  
Ultrasound Assisted

An efficient procedure for ultrasound-assisted enzymatic extraction of crude polysaccharides fromTrichosanthes Fructus(crude TFP) using response surface methodology (RSM) was developed. The Box–Behnken design was applied to optimize the effects of pH (X1), enzyme amount (X2), extraction temperature (X3), and liquid-to-solid ratio (X4) on the extraction. The statistical analysis indicated that the independent variables (X4,X2, andX3), the quadratic coefficients (X12,X22,X32, andX42), and the interaction coefficient (X1X3) had significant impact on the yield of crude TFP. The optimal conditions were determined as follows: pH 4.5, enzyme amount 5000 u/g, extraction temperature 45°C, and liquid-to-solid ratio 30 ml/g. The experimental yield of crude TFP was 6.58%, which was very close to the predicted yield of 6.71%. TFPI was then purified and characterized with Sephadex G-100 column, UV-Vis, GPC, and FT-IR. The average molecular weight of TFPI was calculated to be 1.49 × 105 Da. TFPI exhibited strong reducing power and possessed not only remarkable scavenging activities against ABTS•+and DPPH radicals, but also high antitumor activities in C4-2, DU145, and PC3 cells. The results suggest thatTrichosanthes Fructusand TFPI could be a novel potent natural medicine with antioxidant and antitumor activities.

scholarly journals Ultrasound-Assisted Ultra-Mild-Acid Hydrolisis of -Carrageenan

REAKTOR ◽  
2018 ◽  
Vol 17 (4) ◽  
pp. 191
Author(s):  
Ratnawati Ratnawati ◽  
Nita Indriyani
Keyword(s):  
Molecular Weight ◽  
Acid Hydrolysis ◽  
Average Molecular Weight ◽  
Weight Fraction ◽  
Number Average Molecular Weight ◽  
Hydrolysis Process ◽  
Higher Temperature ◽  
Ultrasound Assisted ◽  
Hydrolysis Of ◽  
Mild Acid

The low molecular weight fraction of κ-carrageenan is useful in biomedical applications. An ultrasound-assisted acid hydrolysis of κ-carrageenan has been studied. κ-carrageenan with an initial number-average molecular weight of 629 kDa was dispersed in distilled water to form a 5 g/l solution. The pH (3 and 6) of the solution was adjusted by adding HCl solution. The depolymerization reaction was carried out in an ultrasonic device at various temperatures (30, 40, 50, and 60°C) and times (8, 16, 24, and 32 min). The experimental results showed that ultrasound positively contributed to acid hydrolysis process. The number-average molecular weight of the treated k-carrageenan was lower or the percentage of reduction was higher at lower pH, longer reaction time, and higher temperature. The lowest number-average molecular weight (14 kDa) or the highest percent of molecular weight reduction reduction (97.7%) was achieved after ultrasonic irradiation at 60°C and pH 3 for 32 min. Keywords: depolymerization; midpoint scission; ultrasonication

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