| Title | Antioxidant and flexible bioplastics based on microwave-assisted extracted coffee fruit cascara pectic polysaccharides |
|---|---|
| ID_Doc | 26013 |
| Authors | Oliveira, G; Petronilho, S; Kapusniak, K; Kapusniak, J; del Castillo, MD; Coimbra, MA; Ferreira, P; Passos, CP; Gonçalves, I |
| Title | Antioxidant and flexible bioplastics based on microwave-assisted extracted coffee fruit cascara pectic polysaccharides |
| Year | 2024 |
| Published | |
| Abstract | Pectic polysaccharides with film-forming ability are often recovered from renewable agrifood by-products through solid-liquid extraction (SLE). Targeting an organic solvent-free approach, in this work, it is hypothesized that pectic polysaccharides of interest for bioplastics development can be recovered by microwave-assisted extraction (MAE) and purified by ultrafiltration. Coffee fruit cascara (CFC) was used as raw material. MAE of CFC-derived pectic polysaccharides was carried out at 120 degrees C at different times (2 min, 5 min, and 10 min). A 3times (1 h each) sequential SLE with 2% acetic acid under reflux at atmospheric pressure was also performed. High molecular weight (HMW) extracts obtained by MAE for 2 min (HMW_MAE 2 ') and by SLE for 1 h (HMW_SLE1), composed of 60 mol% and 54 mol% uronic acids with 18% and 17% methyl-esterification, and 7% and 8% acetylation, respectively, were selected for bioplastics development. HMW_MAE 2' originated slightly transparent, dark brown, hydrophilic (ca. 32 degrees water contact angle), and antioxidant (90% ABTS center dot+ inhibition after 5 min) bioplastics, similar to HMW_SLE1-derived materials, but 10-fold more stretchable (20% and 2% elongation at break, respectively). Therefore, MAE followed by ultrafiltration showed to be a fast and clean strategy to recover low methyl-esterified CFC pectic polysaccharides with the ability to develop antioxidant and flexible bioplastics. |
| https://doi.org/10.1016/j.jclepro.2024.142264 |
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