Conversion of cassava starch to ethanol and a byproduct under different hydrolysis conditions. Issue 7 (20th April 2015)

• Record Type: Journal Article
• Authors: Mayer, Flávio Dias; Gasparotto, Juliana Machado; Klauck, Evelin; Werle, Leandro Bernardi; Jahn, Sergio Luiz; Hoffmann, Ronaldo; Mazutti, Marcio Antônio
• Is Part Of: Stärke. Volume 67:Issue 7/8(2015:Jul.)
• Page Start: 620
• Page End: 628
• Publication Date: 2015-04-20
• Subjects: Starch -- Periodicals; 572.566
• DOI: 10.1002/star.201500043
• Languages: English
• ISSNs: 0038-9056

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <sec id="star201500043-sec-0001" sec-type="section"> <p>Cassava starch can be converted into sugars by enzymatic hydrolysis to be used for ethanol production. In this work, the studied variables were starch and enzymes concentration seeking a higher conversion of the reducing sugars routine. Two series of experiments were conducted following the steps of gelatinization, liquefaction, and saccharification, ending with the fermentation step. It was found that a 100–250 times increase in α‐amylase concentration results in a 23% increase in the starch yield. Therefore, an optimal enzyme concentration could be found. The glucoamylase enzyme has proved to be more effective, evaluated by the rate of starch conversion (<italic>k</italic>), at a lower concentration of starch (10%), and enzyme (10 U/g). In simultaneous saccharification and fermentation (SSF), the hydrolysis yield was 33% higher than in a conventional process, achieving efficiencies higher than 70%. The solid residue separated after the SSF process proved to be a high‐quality animal feed additive.</p> </sec> </abstract>