Investigation of biomass degradation mechanism in pretreatment of switchgrass by aqueous ammonia and sodium hydroxide

Bioresource Technology
Rajesh Gupta, Y Y Lee

Abstract

Pretreatment of switchgrass using aqueous ammonia or NaOH was investigated as a means to enhance the enzymatic digestibility. To increase the effectiveness of pretreatment, H(2)O(2) was supplemented with the alkaline reagents. Since H(2)O(2) is unstable at high temperature, low-to-high step-change of temperature was applied, and this scheme was found to be effective in the case of NH(3)/H(2)O(2) treatment. The composition of pretreatment liquid indicates that hemicellulose solubilized during alkaline treatment exists either in the form of oligomers or as lignin-carbohydrate complex (LCC). LCC formation was prominent in ammonia treatment and in NaOH/H(2)O(2) treatment, and that LCC formation protects the hemicelluloses sugars from degradation. Lignin in the pretreatment liquor was precipitated and subjected to TGA and FTIR analyses. TGA data indicate that NaOH-lignin has more uniform structure and higher O/C ratio than ammonia-lignin. FTIR analysis indicates that NaOH-lignin has lower aromatic content but higher guaiacyl type structure than ammonia-lignin.

References

Jun 13, 2000·Applied Biochemistry and Biotechnology·Q Xiang, Y Y Lee
Jul 2, 2003·Bioresource Technology·Tae Hyun KimY Y Lee
May 27, 2005·Applied Biochemistry and Biotechnology·Alex BerlinJohn Saddler
Feb 10, 2007·Science·Michael E HimmelThomas D Foust
Apr 18, 2008·Applied Biochemistry and Biotechnology·Rajesh GuptaYoon Y Lee
Mar 27, 2009·Biotechnology Progress·Rajesh Gupta, Y Y Lee

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Citations

Dec 20, 2013·Environmental Technology·Esperanza JuradoIoannis V Skiadas
Jan 1, 2011·Annual Review of Chemical and Biomolecular Engineering·Shishir P S ChundawatBruce E Dale
Sep 24, 2014·Applied Biochemistry and Biotechnology·Donglin XinJunhua Zhang
Dec 22, 2012·Bioresource Technology·Zhongguo LiuJohn M Prausnitz
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Dec 4, 2015·Biotechnology for Biofuels·Maira Prearo GrimaldiSandra Regina Pombeiro Sponchiado
Sep 3, 2014·Bioresource Technology·Saksit ImmanNavadol Laosiripojana
Jan 4, 2017·Preparative Biochemistry & Biotechnology·Juliet VictoriaArvind Lali
Nov 26, 2014·ChemSusChem·Garima BaliArthur J Ragauskas
Feb 17, 2017·Biotechnology for Biofuels·Zhaoyang YuanD Mark Martinez
Sep 15, 2015·ChemSusChem·Marcos Henrique Luciano SilveiraLuiz Pereira Ramos
May 16, 2020·Frontiers in Bioengineering and Biotechnology·Deisi Cristina TápparoGislaine Fongaro
Oct 20, 2020·Applied Microbiology and Biotechnology·Abdulmoseen Segun GiwaMuhammad Asif

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