Influence of Ultrasonics in Ammonia Steeped Switchgrass for Enzymatic Hydrolysis

dc.contributor.author Srinivasan, Gowrishankar
dc.contributor.author Srinivasan, Gowrishankar
dc.contributor.author Raman, D.
dc.contributor.author Montalbo-lomboy, Melissa
dc.contributor.author Srinivasan, Gowrishankar
dc.contributor.author Raman, D. Raj
dc.contributor.author Anex, Robert
dc.contributor.author Grewell, David
dc.contributor.author Grewell, David
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-02-13T03:45:25.000
dc.date.accessioned 2020-06-29T22:34:47Z
dc.date.available 2020-06-29T22:34:47Z
dc.date.copyright Mon Jan 01 00:00:00 UTC 2007
dc.date.embargo 2012-12-07
dc.date.issued 2007-06-01
dc.description.abstract <p>The bioconversion of lignocellulosic materials into fuels is of great environmental and economic importance, because of the large amounts of feedstock (est. over 1 billion tons per year), the potentially low cost of this feedstock, and the potentially high net energy balance the overall process. Switchgrass (Panicum virgatum L.) is a candidate dedicated lignocellulosic feedstock in the US. However, lignocellulosic materials, including switchgrass, are hampered by the recalcitrance of lignocellulose to enzymatic degradation into fermentable sugars. Various types of pretreatment have been developed to overcome this recalcitrance. In this study, we examined sequential ammonia-steeping and ultrasound pretreatment of switchgrass. The experimental variables included ultrasound energy dissipation and source amplitude, biomass concentrations, and antibacterial agents. Specifically, the 35-mL samples received either 2000 J or 5000 J, while biomass concentration was at 10% and 30% (mass basis). Antibacterial agents were employed to determine the extent to which sugars were being metabolized by naturally occurring bacteria in the unsterilized pretreated samples. Analytical glucose analysis was conducted to verify the amount of fermentable sugars released and low-vacuum SEM was used to establish the physical effect of ultrasonics on the biomass. The sequential ammonia steeping-ultrasonic pretreatment released about 10% more fermentable sugars than did ammonia steeping alone. However, the net energy balance (additional chemical in free sugars minus energy consumption of ultrasound process) was not favorable - this contrasts with Grewell's work using ultrasonics for enhancing sugar release from starches. We recommend further investigations on re-evaluating the design and conditions which could make ultrasonic work better as a lignocellulosic pretreatment.</p>
dc.description.comments <p>This is an ASABE Meeting Presentation, Paper No. <a href="http://elibrary.asabe.org/abstract.asp?aid=23070&t=3&dabs=Y&redir=&redirType=" target="_blank">076231</a>.</p>
dc.identifier archive/lib.dr.iastate.edu/abe_eng_conf/49/
dc.identifier.articleid 1056
dc.identifier.contextkey 3522310
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_conf/49
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/526
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_conf/49/Raman_2007_InfluenceUltrasonicsAmmonia.pdf|||Sat Jan 15 00:29:00 UTC 2022
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords Lignocellulosics
dc.subject.keywords ethanol
dc.subject.keywords switchgrass
dc.subject.keywords ultrasonics
dc.subject.keywords ammonia steeping
dc.subject.keywords pretreatment
dc.subject.keywords enzymatic hydrolysis
dc.title Influence of Ultrasonics in Ammonia Steeped Switchgrass for Enzymatic Hydrolysis
dc.type article
dc.type.genre conference
dspace.entity.type Publication
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