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Low-Quality Coffee Beans Used as a Novel Biomass Source of Cellulose Nanocrystals

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Resumo:Most polymeric plastics used as food packaging are obtained from petroleum or made with non-biodegradable synthetic molecules, which slowly degrade and leach into the environment, resulting in the accumulation of microplastics along the trophic chains. To mitigate these impacts, biodegradable packaging derived from agro-industrial biomass residues has emerged as a promising alternative. In this study, bio-based methylcellulose films reinforced with cellulose nanocrystals (CNCs) extracted from low-quality coffee beans were developed and fully characterized. The extracted CNCs presented a needle-like morphology, with an average height of 7.27 nm and a length of 221.34 nm, with 65.75% crystallinity, were stable at pH 7–8, and presented thermogravimetric mass loss of 8.0%. Methylcellulose films containing 0.6% w/w of CNC were produced by casting and characterized in terms of thermal, mechanical, and optical properties. Notably, the incorporation of CNCs resulted in significantly more flexible and less rigid films, as evidenced by the higher elongation at break (57.90%) and lower Young’s modulus (0.0015 GPa) compared to neat methylcellulose film. The tensile strength was not affected (p > 0.05). Additionally, the MCNC 0.6% films effectively blocked UV light in the 200–300 nm range without compromising transparency. Altogether, these findings underscore the MCNC 0.6% film as a flexible, biodegradable packaging material suitable for food industry application.
Autores principais:Paulino, Graziela dos Santos
Outros Autores:Pereira, Júlia Santos; Marques, Clara Suprani; Vitalino, Kyssila Vitória Reis; Souza, Victor G. L.; Aguilar, Ananda Pereira; Almeida, Lucas Filipe; de Oliveira, Taíla Veloso; Ribon, Andréa de Oliveira Barros; Ferreira, Sukarno Olavo; Moura, Eveline Teixeira Caixeta; Silva, Deusanilde de Jesus; Mendes, Tiago Antônio de Oliveira
Assunto:Acid hydrolysis Agro-industrial waste Bioplastics Crystallinity Methylcellulose Nature and Landscape Conservation Management, Monitoring, Policy and Law
Ano:2025
País:Portugal
Tipo de documento:artigo
Tipo de acesso:acesso aberto
Instituição associada:Universidade Nova de Lisboa
Idioma:inglês
Origem:Repositório Institucional da UNL

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