Enzymatic hydrolysis of cassava and puba for maltose syrup production. / Hidrólise enzimática de mandioca e puba para a obtenção de xarope de maltose.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2003

RESUMO

Nowadays the consumption of maltose syrups is increasing due to its utilization in breweries where it replaces starch adjuncts. Traditionally maltose syrup has been produced from cornstarch or pellets using acid and/or enzymatic hydrolysis. The objective of this work was to evaluate the possibility of obtaining maltose from starch sources other than maize, such as cassava roots or puba, a fermented cassava product, without extraction of the starch, using bacterial a-amylase and fungal a-amylase for starch hydrolysis. Cassava and puba samples with 10, 20 and 30% dry matter were incubated with termostable bacterial a-amylase for 10, 20 and 30 minutes at 80 0 C, followed by the addition of fungal a-amylase. The samples were incubated for 48 hours at 55 0 C. The degree of saccharification, expressed as dextrose equivalent (DE), was determined by the DNS method. The glucose and maltose contents of the hydrolysate were determined after 48 hours by HPLC. The results showed that the time of action of a-amylase did not influence the degree of saccharification of the samples but the solids concentration significantly affected the hydrolysis degree. The saccharification degree curves were similar for both cassava and puba. The maltose content of the samples varied between 30-60% and the glucose content between 0-10%, which characterized them as "High maltose syrups". The hydrolysis efficiency was lower than expected. However, this fact could be explained by the use of cassava without extraction of the starch and by the difficulty of extracting the solids by centrifugation. It was concluded that for replacement of corn starch, both cassava roots and puba could be used as raw materials for maltose syrup production by enzymatic hydrolysis. However the puba was easier to handle than cassava. The puba treatment consisting of 20% of solids and 10 minutes exposure to a-amylase gave the highest yield reaching 4.2 kg of maltose and 0.3 kg of glucose per 100 kg of raw cassava, in addition to a lower solids residue of 13.7 kg.

ASSUNTO(S)

cassava maltose syrup puba fermentação fermentation hidrólise enzimática mandioca enzymatic hydrolysis xarope de maltose fermented cassava

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