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Supercritical CO2-impregnation of clove extract in PLLA films: Assessing process parameter effects on extract loading and composition

2023; Elsevier BV; Volume: 205; Linguagem: Inglês

10.1016/j.supflu.2023.106144

1872-8162

Amanda Martins Jordão, João Henrique dos Anjos Cardoso, Eric Keven Silva, Lígia Passos Maia-Obi, Bruno Guzzo da Silva, Mathilde Champeau,

Carbon dioxide utilization in catalysis

The supercritical carbon dioxide (scCO2) impregnation of clove extract (CE) into poly(L-lactic acid) (PLLA) films was explored with varying pressure (10–30 MPa) and temperature (35–60 °C), achieving high clove extract loadings (CL) (12.3 - 44.4%). In all conditions, impregnated extracts exhibited elevated eugenol content and reduced content of eugenyl acetate, β-caryophyllene, and α-humulene, compared to crude extract, showing the selective character of the process. Strong eugenol/PLLA affinity demonstrated by solubility parameters and hydrogen bonds permitted its effective impregnation. Eugenol significantly plasticized PLLA film, resulting in alterations in its microstructure, including increased crystallinity and smaller crystals. A CL of 23.8% maintained a dense and uniform structure of PLLA, while 44.4% induced a thick microporous layer on the surfaces. CE-impregnated PLLA, rich in eugenol, is promising for developing active food packaging and extract-releasing medical.