Effects of acid and alkali promoters on compressed liquid hot water pretreatment of rice straw

Imman, Saksit; Arnthong, Jantima; Burapatana, Vorakan; Champreda, Verawat; Laosiripojana, Navadol

doi:10.1016/j.biortech.2014.08.022

Cited by 53 publications

(26 citation statements)

References 29 publications

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“…In addition, among the one-step pretreatments, the H-samples showed the best effect of enzymatic hydrolysis due to the significant NaOH-delignification of lignocellulose samples and the effect of enzymatic hydrolysis followed the order of H > P > A. It was confirmed from the result that alkali-delignification reduced the obstruction of complex phenyl-structure lignin (Imman et al, 2014). Secondly, the depolymerization of concentrated H 3 PO 4 disordered the crystalline structure of cellulose and this was propitious to the enzymatic hydrolysis of lignocellulose samples (Zhang et al, 2014).…”

Section: Xrd Analysissupporting

confidence: 74%

The correlation between cellulose allomorphs (I and II) and conversion after removal of hemicellulose and lignin of lignocellulose

Song

Zhang

et al. 2015

Bioresource Technology

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Section: Xrd Analysissupporting

confidence: 74%

The correlation between cellulose allomorphs (I and II) and conversion after removal of hemicellulose and lignin of lignocellulose

Song

Zhang

et al. 2015

Bioresource Technology

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“…Although LHW treatment of PT-TP and PT-TS did not promote high yields of sugars within the liquid hydrolysates, as shown in Tables 3 and 4, LHW liquid fractions from raw TP and TS, treated specifically at 160 °C, seemed to be more promising for valorization as a source of bioethanol production [26, 49]. Thus, an extensive techno-economical study would be of high interest to determine the feasibility of utilizing these industrial by-products for ethanol production.…”

Section: Resultsmentioning

confidence: 99%

Biorefinery cascade processing for creating added value on tomato industrial by-products from Tunisia

Kehili

Schmidt

Reynolds

et al. 2016

Biotechnol Biofuels

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BackgroundIn today’s consumer perception of industrial processes and food production, aspects like food quality, human health, environmental safety, and energy security have become the keywords. Therefore, much effort has been extended toward adding value to biowastes of agri-food industries through biorefinery processing approaches. This study focused, for the first time, on the valorization of tomato by-products of a Tunisian industry for the recovery of value-added compounds using biorefinery cascade processing.ResultsThe process integrated supercritical CO2 extraction of carotenoids within the oil fractions from tomato seeds (TS) and tomato peels (TP), followed by a batch isolation of protein from the residues. The remaining lignocellulosic matter from both fractions was then submitted to a liquid hot water (LHW) hydrolysis. Supercritical CO2 experiments extracted 5.79% oleoresin, 410.53 mg lycopene/kg, and 31.38 mg β-carotene/kg from TP and 26.29% oil, 27.84 mg lycopene/kg, and 5.25 mg β-carotene/kg from TS, on dry weights. Protein extraction yields, nearing 30% of the initial protein contents equal to 13.28% in TP and 39.26% in TS, revealed that TP and TS are a rich source of essential amino acids. LHW treatment run at 120–200 °C, 50 bar for 30 min showed that a temperature of 160 °C was the most convenient for cellulose and hemicellulose hydrolysis from TP and TS, while keeping the degradation products low.ConclusionsResults indicated that tomato by-products are not only a green source of lycopene-rich oleoresin and tomato seed oil (TSO) and of protein with good nutritional quality but also a source of lignocellulosic matter with potential for bioethanol production. This study would provide an important reference for the concept and the feasibility of the cascade fractionation of valuable compounds from tomato industrial by-products.Graphical abstractSchema of biorefinery cascade processing of tomato industrial by-products toward isolation of valuable fractions.

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“…Dilute acid pre‐treatment (DAP) is one of the most popular pre‐treatment methods because of the low cost of sulfuric acid and ability to perform well on multiple feedstocks. X‐ray diffraction (XRD) analysis showed that the crystallinity Index (CrI) of rice straw increased by about 10% after DAP (Table ) and the possible reason for this apparent increase is the removal of amorphous hemicellulose and lignin and the subsequent enrichment in the concentration of crystalline cellulose . Fourier Transform InfraRed (FTIR) spectroscopy analysis showed that peak intensities for hemicelluloses were either reduced or diminished after DAP but no change in the crystalline cellulose region was observed .…”

Section: Pre‐treatment Of Rice Strawmentioning

confidence: 99%

Rice straw as a feedstock for biofuels: Availability, recalcitrance, and chemical properties

Satlewal

Agrawal

Bhagia

et al. 2017

Biofuels Bioprod Bioref

142

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The surplus availability of rice straw, its limited usage, and environmental pollution caused by its ineffi cient burning has fostered research for its valorization to biofuels. This review elucidates the current status of rice straw potential around the globe along with recent advances in revealing the critical factors responsible for its recalcitrance and chemical properties. The role and accumulation of high silica content in rice straw has been elucidated with its impact on enzymatic hydrolysis in a biorefi nery environment. The correlation of different pre-treatment approaches in modifying the physiochemical properties of rice straw and improving the enzymatic accessibility has also been discussed. This study highlights new challenges, resolutions, and opportunities for rice straw based biorefi neries.

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Effects of acid and alkali promoters on compressed liquid hot water pretreatment of rice straw

Cited by 53 publications

References 29 publications

The correlation between cellulose allomorphs (I and II) and conversion after removal of hemicellulose and lignin of lignocellulose

The correlation between cellulose allomorphs (I and II) and conversion after removal of hemicellulose and lignin of lignocellulose

Biorefinery cascade processing for creating added value on tomato industrial by-products from Tunisia

Rice straw as a feedstock for biofuels: Availability, recalcitrance, and chemical properties

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