Effect of hot water extraction on pyrolysis of tender coconut fruit biomass: kinetic and thermodynamic parameters

The research in this paper optimized the extraction technique of lentinan with ultrasonic assistant method on the basis of hot water extraction technique, and investigated the promoting function of ultrasound to polysaccharides extraction. Extraction condition was selected by means of orthogonal experimental design, four factors and three levels L9(34), after key elements were respectively chosen through single factor experiments. Comparison between optimal extraction parameters of two method, hot water extraction technique and ultrasonic assistant extraction technique, showed decreased extraction temperature and significantly shortened extraction time, which existed in the second means, improved the extraction efficiency. Lentinus edodes polysaccharide extracted with ultrasonic assistant technique, the extraction rate and polysaccharide content percentage increased 6.22% and 8.66% respectively, comparative to which extracted with hot water extraction technique.

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Improving dimensional stability of injection molded wood plastic composites using cold and hot water extraction methods

Maderas Ciencia y tecnología ◽

10.4067/s0718-221x2014005000029 ◽

2014 ◽

pp. 0-0 ◽

Cited By ~ 2

Author(s):

Ferhat Ozdemir ◽

Nadir Ayrilmis ◽

Alperen Kaymakci ◽

Jin Heon Kwon

Keyword(s):

Dimensional Stability ◽

Extraction Methods ◽

Hot Water ◽

Water Extraction ◽

Wood Plastic Composites ◽

Hot Water Extraction ◽

Plastic Composites ◽

Injection Molded ◽

Molded Wood

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Optimization of the extraction of galactoglucomannans from Pinus halepensis

Holzforschung ◽

10.1515/hf-2020-0095 ◽

2020 ◽

Vol 0 (0) ◽

Author(s):

Nacera Benouadah ◽

Andrey Pranovich ◽

Djamel Aliouche ◽

Jalel Labidi ◽

Stefan Willför

Keyword(s):

High Performance ◽

Pinus Halepensis ◽

Hot Water ◽

Water Extraction ◽

Chemical Degradation ◽

Extraction Time ◽

Size Exclusion ◽

Hot Water Extraction ◽

Extraction Processes ◽

Extraction Parameters

AbstractThe effectiveness of pressurized hot-water extraction conditions for obtaining galactoglucomannans (GGMs) from Pinus halepensis suitable for applications like coatings and films packaging was investigated. For this purpose, high molar masses with high yields are required, presenting a serious challenge for hot-water extraction processes. The extraction of GGMs was carried out in an accelerated solvent extractor (ASE) and the isolation was performed by precipitation in ethanol. Three temperatures in the range 160–180 °C and five extraction times 5–90 min were tested in order to optimize extraction parameters of GGMs, avoiding thermal and chemical degradation in hot-water. Total dissolved solids (TDS) were determined gravimetrically after freeze-drying and weight average molar masses (Mw) were determined by high-performance size exclusion chromatography (HPSEC). Total non-cellulosic carbohydrates were determined by gas chromatography (GC) after acid methanolysis. Free monomers were additionally analyzed by GC. Lignin in water extracts was measured by an ultraviolet (UV) method. Acetic acid was determined after alkaline hydrolysis of acetyl groups and analyzed by HPSEC. The main parameters influencing the extraction processes of the GGMs, namely, extraction time and temperature were studied. Optimal extraction parameters of GGMs were identified at 170 °C and 20 min extraction time, with average Mw of extracted fraction of 7 kDa leading to a GGM yield of approximately 56 ${\text{mgg}}_{\text{o}.\text{d}.\text{m}}^{-1}$, corresponding to 6% on dry wood basis.

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