Dilute acid pretreatment of rice straw, structural characterization and optimization of enzymatic hydrolysis conditions by response surface methodology

<!DOCTYPE html>   <html lang="en">  <head id="Head1"> <title> Dilute acid pretreatment of rice straw, structural characterization and optimization of enzymatic hydrolysis conditions by response surface methodology - RSC Advances (RSC Publishing) </title> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"><script type="text/javascript">window.NREUM||(NREUM={});NREUM.info = {"beacon":"bam.nr-data.net","errorBeacon":"bam.nr-data.net","licenseKey":"NRJS-aaa897feae8feeca979","applicationID":"1313546638","transactionName":"M1wANxQFCEcDVU0PWgoWLzUlSyVbDEJcCEEnVgwXFAsKWAdEFgdHEFABDwMIB1oGX1cB","queueTime":0,"applicationTime":138,"agent":"","atts":""}</script><script type="text/javascript">(window.NREUM||(NREUM={})).init={privacy:{cookies_enabled:true},ajax:{deny_list:["bam.nr-data.net"]},distributed_tracing:{enabled:true}};(window.NREUM||(NREUM={})).loader_config={agentID:"1386013924",accountID:"2851366",trustKey:"1029994",xpid:"Vg4CUFVVDhABV1BRAgUBUFcJ",licenseKey:"NRJS-aaa897feae8feeca979",applicationID:"1313546638"};;/*! 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Chatterjee; citation_journal_title=Sustainable Mater. Technol.; citation_volume=3; citation_pages=17-28;citation_publication_date=2015; " /> <meta name="citation_reference" content="citation_author=M. Negro; citation_author=P. Manzanares; citation_author=I. Ballesteros; citation_author=J. Oliva; citation_author=A. Cabanas; citation_author=M. Ballesteros; citation_journal_title=Appl. Biochem. Biotechnol.; citation_volume=105; citation_pages=87-100;citation_publication_date=2003; " /> <meta content="Efficient conversion of fermentable sugars from cheap lignocellulosic biomass is a current need in viable ethanol production technology. In the present study, agricultural waste biomass such as rice straw was pretreated by using 0.5% sulfuric acid for 60 min at 121 °C in an autoclave. A statistical experimental design like central composite design (CCD) was used for optimization of the enzymatic hydrolysis conditions to achieve a significant reducing sugar yield using commercial cellulase. The optimal conditions for acid pretreated rice straw were found to be 40 FPU g−1 enzymes loading, 17.50% biomass loading at 50 °C for 72 h. The reducing sugar yield was 0.359 g g−1, achieved at the optimized conditions. Experimental results under optimum conditions fit well with CCD model predictions. The structural and morphological changes in native and dilute acid treated rice straw substrate were evaluated by FTIR, XRD and SEM analysis. The XRD pattern of biomass revealed an increase in the crystallite size and crystallinity index of pretreated biomass. Scanning electron micrography reported surface porosity and a distorted structure due to pretreatment. 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Click to view all articles in this issue." title="Issue 58, 2015">Issue 58, 2015</a> </div> <nav aria-label="Article"> <ul class="article-nav__bar"> <li> <a href="/en/Content/ArticleLanding/2015/RA/C5RA06347G"> Previous <span class="v-mobile-hide--inline">Article</span> </a> </li> <li> <a href="/en/Content/ArticleLanding/2015/RA/C5RA05920H"> Next <span class="v-mobile-hide--inline">Article</span> </a> </li> </ul> </nav> <div class="list-control"> <div class="list__collection--image"> <div class="list__item"> <a href="/en/journals/journal/ra" class="list__item-link"> <div class="list__image-col"> <img src="/en/Image/Get?imageInfo.ImageType=CoverIssue&imageInfo.ImageIdentifier.SerCode=RA&imageInfo.ImageIdentifier.IssueId=RA005058" id="imgLoader" alt="" class="list__item-img" height="88"> </div> <div class="list__text-col"> <div class="list__item-label"> <span class="page-head__context">From the journal:</span> <h3 class="h--heading3 no-heading">RSC Advances</h3> </div> </div> </a> </div> </div> </div> <br> </div> <article class="article-control"> <div class="article__title"> <h2 class="capsule__title fixpadv--m"> Dilute acid pretreatment of rice straw, structural characterization and optimization of enzymatic hydrolysis conditions by response surface methodology<a href="#fn1" title="Electronic supplementary information (ESI) available. See DOI: 10.1039/c5ra04430h">†</a> </h2> <div class="fixpadv--m crossmark-button"> <button type="button" data-target="crossmark"><img width="150" height="32" src="https://crossmark-cdn.crossref.org/widget/v2.0/logos/CROSSMARK_Color_horizontal.svg" alt="Check for updates" /></button> </div> </div> <div class="article__authors"> <span class="article__author-link"> <a href="/en/results?searchtext=Author%3ASiddheshwar%20Dnyandev%20Kshirsagar">Siddheshwar Dnyandev Kshirsagar</a>,<span><sup><i>ab</i></sup></span>   </span> <span class="article__author-link"> <a href="/en/results?searchtext=Author%3APankajkumar%20Ramdas%20Waghmare">Pankajkumar Ramdas Waghmare</a>,<span><sup><i>b</i></sup></span>   </span> <span class="article__author-link"> <a href="/en/results?searchtext=Author%3APrakash%20Chandrakant%20Loni">Prakash Chandrakant Loni</a>,<span><sup><i>c</i></sup></span>   </span> <span class="article__author-link"> <a href="/en/results?searchtext=Author%3ASushama%20Anandrao%20Patil">Sushama Anandrao Patil</a><span><sup><i>a</i></sup></span>  and  </span> <span class="article__author-link"> <a href="/en/results?searchtext=Author%3ASanjay%20Prabhu%20Govindwar">Sanjay Prabhu Govindwar</a>*<span><sup><i>b</i></sup></span>   </span> </div> <div class="drawer-control fixpadv--m"> <a href="#" role="button" id="btnAuthorAffiliations" aria-expanded="false" aria-controls="pnlAuthorAffiliations" class="drawer__handle"> <span class="drawer__icon"></span> Author affiliations </a> <div class="drawer__content" id="pnlAuthorAffiliations" aria-labelledby="btnAuthorAffiliations"> <div> <p class="article__author-affiliation"> <span> * </span> <span> Corresponding authors </span> </p> <p class="article__author-affiliation"> <span> <sup>a</sup> </span> <span> Department of Biotechnology, Shivaji University, Kolhapur-416004, India </span> </p> <p class="article__author-affiliation"> <span> <sup>b</sup> </span> <span> Department of Biochemistry, Shivaji University, Kolhapur-416004, India <br /> <b>E-mail:</b> <a href="mailto:spg_biochem@unishivaji.ac.in" title="spg_biochem@unishivaji.ac.in">spg_biochem@unishivaji.ac.in</a>, <a href="mailto:spgovindwar@rediffmail.com" title="spgovindwar@rediffmail.com">spgovindwar@rediffmail.com</a> <br /> <b>Fax:</b> +91-231-2691533 <br /> <b>Tel:</b> +91-231-2609152 </span> </p> <p class="article__author-affiliation"> <span> <sup>c</sup> </span> <span> Department of Environmental Biotechnology, Shivaji University, Kolhapur-416004, India </span> </p> </div> </div> </div> <h3 class="h--heading3 article-abstract__heading">Abstract</h3> <div class="capsule__column-wrapper"> <div class="capsule__text"> <p xmlns="http://www.rsc.org/schema/rscart38">Efficient conversion of fermentable sugars from cheap lignocellulosic biomass is a current need in viable ethanol production technology. In the present study, agricultural waste biomass such as rice straw was pretreated by using 0.5% sulfuric acid for 60 min at 121 °C in an autoclave. A statistical experimental design like central composite design (CCD) was used for optimization of the enzymatic hydrolysis conditions to achieve a significant reducing sugar yield using commercial cellulase. The optimal conditions for acid pretreated rice straw were found to be 40 FPU g<small><sup>−1</sup></small> enzymes loading, 17.50% biomass loading at 50 °C for 72 h. The reducing sugar yield was 0.359 g g<small><sup>−1</sup></small>, achieved at the optimized conditions. Experimental results under optimum conditions fit well with CCD model predictions. The structural and morphological changes in native and dilute acid treated rice straw substrate were evaluated by FTIR, XRD and SEM analysis. The XRD pattern of biomass revealed an increase in the crystallite size and crystallinity index of pretreated biomass. Scanning electron micrography reported surface porosity and a distorted structure due to pretreatment. HPTLC analysis of sugars like glucose and xylose in hydrolysate produced after enzymatic hydrolysis was determined.</p> </div> <div class="capsule__article-image fixpadv--s"> <img src="/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C5RA04430H&imageInfo.ImageIdentifier.Year=2015" alt="Graphical abstract: Dilute acid pretreatment of rice straw, structural characterization and optimization of enzymatic hydrolysis conditions by response surface methodology" /> </div> </div> <p></p> <div id="pnlArticleAccess" class="article-access fixpadt--xxl" style="display: none; border: 0;"> <div class="article-access__inner" style="background-color: #F1F1F3;"> <div class="article-access__head fixpad--s"> You have access to this article </div> <div class="fixpad--xl"> <div id="pnlViewFullArticleButton" class="paywall__body text--centered"> <div id="pnlArticleLoading"> <span id="thtmlLoadingMessage"> <img 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Dilute acid pretreatment of rice straw, structural characterization and optimization of enzymatic hydrolysis conditions by response surface methodology - RSC Advances (RSC Publishing)