Silver nanoparticles and cellulose microfiber micro-composite from banana (Musa acuminata) waste: green synthesis, antioxidant property and antimicrobial capacity

Abstract

The green chemistry promotes the synthesis of nanomaterials from plant extracts as a new climate intelligent alternative to the use of conventional protocols based on costly and toxic chemicals. Therefore, this research was undertaken to analyses the efficiency of banana (peels and rachis) waste extracts in the production of a micro-composite composed by silver nanoparticles (AgNPs) and cellulose microfibers (CMF) respectively. Results showed the synthesis of 24 nm diameter spherical particles AgNPs, with a peak of absorbance at 410 nm, in (v/v) water:ethanol extracts of banana peels at a final dilution of 3.10-2. Concomitantly, 50-350 µm in length and 5-10 µm of diameter CMF were obtained via the oxalic acid hydrolysis of the oven-dried banana rachis. The micro-composite (AgNPs-CMF) and AgNPs displayed an active reducing capacity over 60% determined by the DPPH test, and active bacterial activity against E. Coli and S. aureus in Petri dishes. Overall results support the use of banana waste for the synthesis of AgNPs and CMF for industrial purposes.

Characterization of starch biofilm reinforced with cellulose microfibers isolated from Musa Saba' midrib residue and its application as an active packaging film

“…[26][27][28][29] Many researchers have isolated and characterized cellulosederived fibers, such as cellulose nanofibers (CNFs), cellulose microfibers (CMFs) and cellulose nanoparticles, from various parts of banana plants, including rachis, bract, pseudo stem, and fruit peels. 16,[30][31][32][33][34][35][36] However, there is no research on CMF obtained from banana midrib residues, particularly Musa Saba' species and its application as a reinforcing agent.…”

“…Banana crop residues have been comprehensively reviewed for potential applications in sewage sectors (as dyes and heavy metals adsorbents), electronic (for the synthesis of supercapacitor electrodes), renewable energy (bioethanol production), and pharmaceuticals and biomedical industries (antiprotozoan, antifungal, and antiviral agent) 26–29 . Many researchers have isolated and characterized cellulose‐derived fibers, such as cellulose nanofibers (CNFs), cellulose microfibers (CMFs) and cellulose nanoparticles, from various parts of banana plants, including rachis, bract, pseudo stem, and fruit peels 16,30–36 . However, there is no research on CMF obtained from banana midrib residues, particularly Musa Saba' species and its application as a reinforcing agent.…”