Microwave Assisted Short-Time Alkaline Extraction of Birch Xylan

Panthapulakkal, Suhara; Pakharenko, Viktoriya; Sain, Mohini

doi:10.1007/s10924-013-0591-1

Cited by 17 publications

(15 citation statements)

References 29 publications

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“…Heteroxylans occur in hardwoods, agricultural products of lignocellulosic nature (straw, herbs, and the like), and cereals (Gullón et al 2014). In general, low power levels are used for the extraction of xylans, considering that a degradation of these polysaccharides can occur as a result of an increase of the temperature in a short time (Panthapulakkal et al 2013). Coelho et al (2014) found that temperatures higher than 180 C, similar to those proposed by Passos and Coimbra (2013) for the extraction of galactomannans, produced depolymerization, debranching, and de-esterification of arabinoxylans, with the formation of brown products.…”

Section: Xylansmentioning

confidence: 94%

“…Because bioactivity of polysaccharides usually depends on their molecular weight and their monomeric composition, a trade-off between the extracted amount and the structural composition is usually aimed during the extraction processes. Before MAE of polysaccharides, samples are usually dried either in convection ovens (45-60 C; (Bagherian et al 2011;Li et al 2012;Prakash Maran et al 2013;Panthapulakkal et al 2013) until constant weight or freeze-dried, ground, and sieved to obtain powdered samples. In some cases, samples are subjected to different pretreatments to enhance extraction efficiency.…”

Section: Applications To Polysaccharide Extractionmentioning

confidence: 99%

“…In some cases, samples are subjected to different pretreatments to enhance extraction efficiency. For instance, sugar beet pulp was bleached at 95 C for 5 min (Li et al 2012), pumpkin flesh powder was treated with 0.1 N HCl (pH 1.0) at 25 C for 1 h (Yoo et al 2012), birchwood powder was treated with 0.05 M HCl at 70 C for 2 h followed by a treatment with 14 M NH 4 OH (Panthapulakkal et al 2013), etc.…”

Section: Applications To Polysaccharide Extractionmentioning

confidence: 99%

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Microwave-Assisted Extraction of Polysaccharides

et al. 2015

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Section: Xylansmentioning

confidence: 94%

Section: Applications To Polysaccharide Extractionmentioning

confidence: 99%

Section: Applications To Polysaccharide Extractionmentioning

confidence: 99%

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Microwave-Assisted Extraction of Polysaccharides

et al. 2015

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“…The fibres passed through the screen were collected and sieved using a 0.42 mm screen to remove fines. The extractives from the wood fibres were removed following the procedure reported earlier [32] and the extractive-free wood was used for all the experiments. The dried extractivefree wood consists of 42.95% ± 1.05% glucan, 29.35% ± 0.69% xylan, 0.96% ± 0.27% mannan, 21.26% ± 0.41% acid insoluble lignin, 1.43% ± 0.13% soluble lignin, and 0.52% ± 0.04% ash content.…”

Section: Methodsmentioning

confidence: 99%

“…However, no available literature to-date reported the optimization of a microwave assisted extraction of xylan from birch wood under mild conditions of temperature and pressure. Our research focused on the development of microwave assisted extraction of xylan using mild reaction conditions such as temperature and power input under atmospheric pressure and preliminary studies indicated that low power input microwave assisted extraction can be used as an efficient alternative to the conventional extraction [32]. We found that a 10 minute microwave extraction of xylan from woody biomass at a low power input leads to a similar extraction yield that obtained at a 90 minutes of extraction at 90˚C using the conventional method.…”

Section: Introductionmentioning

confidence: 97%

Optimization of Microwave Assisted Alkaline Extraction of Xylan from Birch Wood Using Response Surface Methodology

Panthapulakkal¹,

Sain²

2013

MSCE

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The main purpose of this study was to optimize microwave assisted alkaline extraction of the hemicellulose, xylan, from birch wood. The simultaneous effects of process variables such as time (10 -30 minutes), concentration of sodium hydroxide solution (4 -8 wt%), solid to liquid ratio (1:8 to 1:20, g:mL), and sample size (5 -10 g) on the temperature of the wood slurry, wood dissolution, and yield of extraction were evaluated. A central composite design (CCD) and response surface methodology (RSM) were used for the optimization of the extraction process. Based on the CCD, quadratic models were developed to correlate the extraction process variables with the responses such as temperature of wood slurry, wood dissolution, and yield of xylan and the models were analyzed using appropriate statistical methods (ANOVA). Statistical analysis showed that all the models developed were found to be adequate for the prediction of the respective responses. Optimization of the process was performed using a numerical optimization available in the software to maximize the yield of xylan and the optimum process variables for the maximum yield of xylan was found to be: 10 g of wood fibres, 8 wt% of NaOH solution, 1:10 solid to liquid ratio (g:mL) and 25 minutes of irradiation time. About 72.5% of the xylan present in the birch wood was extracted using the optimized extraction parameters.

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Alkaline extraction of xylan from wood using microwave and conventional heating

Panthapulakkal

Kirk

Sain

2014

J of Applied Polymer Sci

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This study aims to investigate the effect of microwave heating versus conventional heating for the alkaline hydrolysis of xylan from birch wood to understand the effect of the heating process on the dissolution of wood, the yield of xylan, and the degree of polymerization of the isolated xylan. The results indicate that the rate of wood dissolution is significantly higher (0.020/s) during microwave extraction than the conventional extraction (0.001/s). Wood solubilization, after an initial rapid removal of damaged fibers, is linear with time for both conventional and microwave extraction, with microwave showing a rate 20 times faster. The yield of xylan reaches a limit of about 60% for both processes but then declines slowly as thermal degradation become significant. Microwave heating provides 60% yield in 1/10th the time of the conventional process. This is found to be associated with the rapid temperature rise, and also with local "hot spots" generated during microwave treatment. The results indicated that xylan degradation was significant above 95 C. The nature of the isolated xylan was different for the two heating methods: the xylan isolated using microwave extraction for 20 min exhibits higher molecular weight (i.e., a greater degree of polymerization, about 150) than the xylan isolated using conventional extraction for the same duration (degree of polymerization, about 124) demonstrating the effectiveness of microwave heating for extraction of xylan from wood.

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Microwave Assisted Short-Time Alkaline Extraction of Birch Xylan

Cited by 17 publications

References 29 publications

Microwave-Assisted Extraction of Polysaccharides

Microwave-Assisted Extraction of Polysaccharides

Optimization of Microwave Assisted Alkaline Extraction of Xylan from Birch Wood Using Response Surface Methodology

Alkaline extraction of xylan from wood using microwave and conventional heating

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