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Amit Arora - One of the best experts on this subject based on the ideXlab platform.
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high xylan recovery using two stage alkali pre treatment Process from high lignin biomass and its valorisation to xylooligosaccharides of low degree of polymerisation
Bioresource Technology, 2018Co-Authors: Ramkrishna Singh, Jhumur Banerjee, S Sasmal, Jane G Muir, Amit AroraAbstract:Abstract In the present work, xylan from arecanut husk was extracted using 2 stage alkaline pretreatment Process. In first step, biomass was incubated in alkali at different temperatures (25 °C, 50 °C and 65 °C), alkali concentrations (5%, 10%, 15% and 20% w/v), and incubation periods (8 h, 16 h and 24 h) and evaluated for xylan recovery. It was observed that 40–52% of available xylan could be recovered using 10% alkali when incubated for 8–24 h at 65 °C. Subsequently, the alkali pretreatment operating conditions which provided good xylan recovery were Processed further using hydrothermal treatment to extract more xylan. For maximum xylan recovery (>90%), best operating conditions were identified when biomass was treated under hydrothermal treatment (1, 1.5 and 2 h) with varying incubation periods (8, 16, 24 h) and alkali concentrations (5%, 10%) using full factorial design. Incubating arecanut husk with 10% w/v NaOH, at 65 °C for a period of 8 h, followed by hydrothermal treatment at 121 °C for 1 h helped recover >94% xylan. In the next step, enzymatic hydrolysis Process was optimized to recover maximum XOS (Optimized condition: 50 °C, pH 4 and 10 U enzyme dose). The hydrolysate comprised of xylobiose: 25.0 ± 1.2 g/100 g xylan (∼71% of XOS), xylotriose: 9.2 ± 0.65 g/100 g xylan (26.2% of XOS) and xylotetrose: 0.9 ± 0.04 g/100 g xylan (2% of XOS). The developed Process enables to reduce alkali consumption for high recovery of xylan from biomass with relatively higher lignin content for its valorisation into a potential prebiotic oligosaccharide.
Jidong Gu - One of the best experts on this subject based on the ideXlab platform.
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decolorization of dyes and textile wastewater by potassium permanganate
Chemosphere, 2005Co-Authors: Xiangrong Xu, Huabin Li, Wenhua Wang, Jidong GuAbstract:Decolorization of 10 types of dye solutions by potassium permanganate was studied. Effects of reaction conditions on the decolorization efficiency were examined in batch experiments. The pH value had a significant effect on the decolorization efficiency. When pH value 4.0, the dye solutions were almost not decolorized. Concentration of potassium permanganate and temperature also showed significant effects on the decolorization efficiency. The decolorization rate of dye solutions by potassium permanganate was rapid, and most of dye solutions can be decolorized effectively. The results of total organic carbon indicated that dye solutions were degraded incompletely by potassium permanganate. The results of treatment of textile wastewater by potassium permanganate indicated that the oxidation with potassium permanganate might be used as a Pre-Treatment Process before biological treatment.
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decolorization of dyes and textile wastewater by potassium permanganate
Chemosphere, 2005Co-Authors: Xiangrong Xu, Huabin Li, Wenhua Wang, Jidong GuAbstract:Decolorization of 10 types of dye solutions by potassium permanganate was studied. Effects of reaction conditions on the decolorization efficiency were examined in batch experiments. The pH value had a significant effect on the decolorization efficiency. When pH value 4.0, the dye solutions were almost not decolorized. Concentration of potassium permanganate and temperature also showed significant effects on the decolorization efficiency. The decolorization rate of dye solutions by potassium permanganate was rapid, and most of dye solutions can be decolorized effectively. The results of total organic carbon indicated that dye solutions were degraded incompletely by potassium permanganate. The results of treatment of textile wastewater by potassium permanganate indicated that the oxidation with potassium permanganate might be used as a Pre-Treatment Process before biological treatment.
Keshavan Niranjan - One of the best experts on this subject based on the ideXlab platform.
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enzymatic hydrolysis of thermally pre treated chitin and antimicrobial activity of n n diacetylchitobiose
Journal of Chemical Technology & Biotechnology, 2019Co-Authors: Munira Zainal Abidin, Constantina Kourmentza, Andreas K Karatzas, Keshavan NiranjanAbstract:BACKGROUND: N,N′‐diacetylchitobiose (GlcNAc₂) is known to be highly functional and offers a wide range of applications, especially as an antimicrobial agent. In this study, a thermal pre‐treatment Process using steam under pressure in an autoclave was employed to facilitate subsequent enzymatic hydrolysis of chitin with chitinase from Streptomyces griseus. RESULTS: Pre‐treatment of chitin with 0.05 mol L⁻¹ sodium acetate buffer (pH = 6.0) at 121 °C for 60 min, followed by enzymatic hydrolysis involving 24 h incubation, were found to be the best conditions for producing GlcNAc₂. The GlcNAc₂ thus obtained was tested regarding its antimicrobial activity against Gram‐negative and Gram‐positive strains and showed minimum inhibitory concentrations at 5 and 10% (w/v) against Escherichia coli K‐12 and Listeria monocytogenes 10403S, respectively. CONCLUSIONS: The extent of swelling and crystallite size of chitin increased with pre‐treatment residence time, and enhanced the rate of subsequent hydrolysis using chitinase. © 2019 Society of Chemical Industry
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Enzymatic hydrolysis of thermally pre‐treated chitin and antimicrobial activity of N,N'‐diacetylchitobiose
Journal of Chemical Technology & Biotechnology, 2019Co-Authors: Munira Zainal Abidin, Constantina Kourmentza, Andreas K Karatzas, Keshavan NiranjanAbstract:BACKGROUND: N,N′‐diacetylchitobiose (GlcNAc₂) is known to be highly functional and offers a wide range of applications, especially as an antimicrobial agent. In this study, a thermal pre‐treatment Process using steam under pressure in an autoclave was employed to facilitate subsequent enzymatic hydrolysis of chitin with chitinase from Streptomyces griseus. RESULTS: Pre‐treatment of chitin with 0.05 mol L⁻¹ sodium acetate buffer (pH = 6.0) at 121 °C for 60 min, followed by enzymatic hydrolysis involving 24 h incubation, were found to be the best conditions for producing GlcNAc₂. The GlcNAc₂ thus obtained was tested regarding its antimicrobial activity against Gram‐negative and Gram‐positive strains and showed minimum inhibitory concentrations at 5 and 10% (w/v) against Escherichia coli K‐12 and Listeria monocytogenes 10403S, respectively. CONCLUSIONS: The extent of swelling and crystallite size of chitin increased with pre‐treatment residence time, and enhanced the rate of subsequent hydrolysis using chitinase. © 2019 Society of Chemical Industry
Munira Zainal Abidin - One of the best experts on this subject based on the ideXlab platform.
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enzymatic hydrolysis of thermally pre treated chitin and antimicrobial activity of n n diacetylchitobiose
Journal of Chemical Technology & Biotechnology, 2019Co-Authors: Munira Zainal Abidin, Constantina Kourmentza, Andreas K Karatzas, Keshavan NiranjanAbstract:BACKGROUND: N,N′‐diacetylchitobiose (GlcNAc₂) is known to be highly functional and offers a wide range of applications, especially as an antimicrobial agent. In this study, a thermal pre‐treatment Process using steam under pressure in an autoclave was employed to facilitate subsequent enzymatic hydrolysis of chitin with chitinase from Streptomyces griseus. RESULTS: Pre‐treatment of chitin with 0.05 mol L⁻¹ sodium acetate buffer (pH = 6.0) at 121 °C for 60 min, followed by enzymatic hydrolysis involving 24 h incubation, were found to be the best conditions for producing GlcNAc₂. The GlcNAc₂ thus obtained was tested regarding its antimicrobial activity against Gram‐negative and Gram‐positive strains and showed minimum inhibitory concentrations at 5 and 10% (w/v) against Escherichia coli K‐12 and Listeria monocytogenes 10403S, respectively. CONCLUSIONS: The extent of swelling and crystallite size of chitin increased with pre‐treatment residence time, and enhanced the rate of subsequent hydrolysis using chitinase. © 2019 Society of Chemical Industry
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Enzymatic hydrolysis of thermally pre‐treated chitin and antimicrobial activity of N,N'‐diacetylchitobiose
Journal of Chemical Technology & Biotechnology, 2019Co-Authors: Munira Zainal Abidin, Constantina Kourmentza, Andreas K Karatzas, Keshavan NiranjanAbstract:BACKGROUND: N,N′‐diacetylchitobiose (GlcNAc₂) is known to be highly functional and offers a wide range of applications, especially as an antimicrobial agent. In this study, a thermal pre‐treatment Process using steam under pressure in an autoclave was employed to facilitate subsequent enzymatic hydrolysis of chitin with chitinase from Streptomyces griseus. RESULTS: Pre‐treatment of chitin with 0.05 mol L⁻¹ sodium acetate buffer (pH = 6.0) at 121 °C for 60 min, followed by enzymatic hydrolysis involving 24 h incubation, were found to be the best conditions for producing GlcNAc₂. The GlcNAc₂ thus obtained was tested regarding its antimicrobial activity against Gram‐negative and Gram‐positive strains and showed minimum inhibitory concentrations at 5 and 10% (w/v) against Escherichia coli K‐12 and Listeria monocytogenes 10403S, respectively. CONCLUSIONS: The extent of swelling and crystallite size of chitin increased with pre‐treatment residence time, and enhanced the rate of subsequent hydrolysis using chitinase. © 2019 Society of Chemical Industry
Razif Harun - One of the best experts on this subject based on the ideXlab platform.
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exploring alkaline pre treatment of microalgal biomass for bioethanol production
Applied Energy, 2011Co-Authors: Razif Harun, W S Y Jason, Tamara Cherrington, Michael K DanquahAbstract:We have investigated, for the first time, the alkaline Pre-Treatment of microalgal biomass, from the species Chlorococcum infusionum, using NaOH for bioethanol production. This Pre-Treatment step aims to release and breakdown entrapped polysaccharides in the microalgae cell walls into fermentable subunits. Three parameters were examined here; the concentration of NaOH, temperature and the Pre-Treatment time. The bioethanol concentration, glucose concentration and the cell size were studied in order to determine the effectiveness of the Pre-Treatment Process. Microscopic analysis was performed to confirm cell rupturing, the highest glucose yield was determined to be 350mg/g, and the maximum bioethanol yield obtained was 0.26g ethanol/g algae using 0.75% (w/v) of NaOH and 120°C for 30min. Overall, the alkaline Pre-Treatment method proved to be promising option to pre-treat microalgal biomass for bioethanol production.