Avaliação de processo alcalino para obtenção de quitosana fúngica
DOI:
https://doi.org/10.22571/2526-4338306Palavras-chave:
Aspergillus niger, Quitina, Desacetilação, desproteinização, bioprocessosResumo
A quitosana é um biopolímero com inúmeras aplicações nas áreas de alimentos, médica, farmacêutica e ambiental, e pode ser obtida a partir da desacetilação da quitina presente na biomassa fúngica. Este estudo avaliou o processo de desacetilação de biomassa fúngica com variações nas concentrações da solução de hidróxido de sódio, proporções de biomassa, tempo de processo e tipo de equipamento. A biomassa fúngica foi produzida pelo fungo Aspergillus niger DAOM em meio potato dextrose broth via bioprocessos submersos. A desacetilação da biomassa foi conduzida utilizando solução de NaOH em concentrações de 4% (1:40 m v-1) em autoclave e 45% (1:20 m v-1) em reator agitado. O grau de desacetilação para as duas técnicas foram similares (>60%). Entretanto, o processo em autoclave apresentou maior rendimento (14,29%). Além disso, os grupos funcionais apresentaram semelhanças entre as amostras do biopolímero, se evidenciando grupos de hidroxilas, aminas primárias e secundárias. Portanto, o processo com o uso de NaOH 4% em autoclave contribuiu na minimização dos aspectos ambientais negativos da produção da quitosana.
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