| Title | Insect residues as an alternative and promising source for the extraction of chitin and chitosan |
|---|---|
| ID_Doc | 20375 |
| Authors | Machado, SSN; da Silva, JBA; Nascimento, RQ; Lemos, PVF; Assis, DD; Marcelino, HR; Ferreira, ED; Cardoso, LG; Pereira, JD; Santana, JS; da Silva, MLA; de Souza, CO |
| Title | Insect residues as an alternative and promising source for the extraction of chitin and chitosan |
| Year | 2024 |
| Published | |
| Abstract | This work aimed to obtain and characterize chitin and chitosan extracted from the rearing residues of Tenebrio molitor, Zophobas morio, and Blaptica dubia insects in different growth stages in the same rearing cycles chitin and chitosan yielded 11.21 %-20.89 % and 6.26 %-7.07 %, respectively. The deacetylation degrees of chitosan ranged from 75.75 %-89.21 %, and the solubilities from 69.88 %-94.39 %. Infrared spectroscopy corroborated the acquisition of chitin and chitosan and can be used as a semi-quantitative technique for determining the degree of chitosan deacetylation. The X-ray diffraction profiles revealed the presence of alpha-chitin, and the relative crystalline indices ranged from 65.9 %-89.2 %. Typical TG profiles with two thermal events are observed for chitin and chitosan samples with different residue contents from the extraction procedure. The chitosan solutions exhibited pseudoplastic behavior, with apparent viscosities ranging from 195.96 to 249.86 mPa.s. The characterization results of the biopolymers extracted from insect residues were similar to those obtained from conventional sources. The growth stage influenced the chitin yield and crystallinity index. The results of this study reinforce the feasibility of using alternative sources of chitin and chitosan, providing the use of waste from insect farms and contributing to sustainability and a circular economy. |
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