Novel Ecogenic Plasmonic Biohybrids as Multifunctional Bioactive Coatings

Abstract

<jats:p>The objective of the present study is the valorization of natural resources and the recycling of vegetal wastes by converting them into novel plasmonic bio-active hybrids. Thus, a “green” approach was used to design pectin-coated bio-nanosilver. Silver nanoparticles were generated from two common garden herbs (Mentha piperita and Amaranthus retroflexus), and pectin was extracted from lemon peels. The samples were characterized by the following methods: Ultraviolet–visible (UV-Vis) absorption spectroscopy, Fourier Transform Infrared (FT-IR), X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), dynamic light scattering (DLS), Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM)–Energy-dispersive X-ray Spectroscopy (EDX), and zeta potential measurements. Microscopic investigations revealed the spherical shape and the nano-scale size of the prepared biohybrids. Their bioperformances were checked in terms of antioxidant and antibacterial activity. The developed plasmonic materials exhibited a strong ability to scavenge short-life (96.1% ÷ 98.7%) and long-life (39.1% ÷ 91%) free radicals. Microbiological analyses demonstrated an impressive antibacterial effectiveness of pectin-based hybrids against Escherichia coli. The results are promising, and the obtained biomaterials could be used in many bio-applications, especially as antioxidant and antimicrobial biocoatings.</jats:p>

Characterization and Antitumoral Activity of Biohybrids Based on Turmeric and Silver/Silver Chloride Nanoparticles

“…Other significant changes in FTIR band position/intensities occurred in the following wavenumber ranges: 800–1000 cm −1 assigned to aromatic rings of curcumin arising from turmeric extract, and to saccharide structure [ 56 ]. 1000–1100 cm −1 attributed to vibrations of the –C–O–C– and –C–O–H bonds present in polysaccharide structures [ 57 ]. 1500–1700 cm −1 characteristic for carboxylate groups (–COO–) [ 51 ] and to amide I, arising due to carbonyl (–C=O) stretch in proteins [ 58 ].…”

“…1000–1100 cm −1 attributed to vibrations of the –C–O–C– and –C–O–H bonds present in polysaccharide structures [ 57 ].…”

Phytosynthesis of silver nanoparticles from Jatropha integerrima Jacq. flower extract and their possible applications as antibacterial and antioxidant agent

“…Silver nanoparticles (AgNPs) are familiar among different nanoparticles for their antibacterial, antioxidant, and cytotoxic properties ( Das et al, 2019 ). Silver nanoparticles are the most often employed nanosized particles in various nanotechnology disciplines, particularly in biomedical applications ( Elisabeta Barbinta-Patrascu et al, 2020 ).…”

Green Design of Novel Starch-Based Packaging Materials Sustaining Human and Environmental Health

“…Liposomes, lipid entities that mimic biomembranes, are used to build-up bionanomaterials with huge potential applications in the biomedical field and food industry (packaging, coatings and additives). Thus, improved biocompatibility, antioxidant, antimicrobial and anticancer activities were achieved by incorporation of active phytoingredients, drugs and phytonanometals into biomimicking lipid bilayers [118][119][120].…”

“…Plants are most abundant in nature, they are renewable, and they are ecofriendly. Plants contain a "cocktail" of active ingredients which could help to sustain and stimulate human immunity; hence it is recommended to use phytosynthesized nanoparticles in food packaging composite nanomaterials, since phytonanometals bear on their surface active compounds derived from plants, which could have beneficial effects on health due to their antioxidant and antimicrobial properties [118,120,[271][272][273][274][275].…”