One-pot synthesis of gelatin-based, slow-release polymer microparticles containing silver nanoparticles and their application in anti-fouling paint

Abstract

Gelatinous polymer matrix microparticles containing silver nanoparticles (AgNPs) were prepared by a novel method to obtain quasi non-swelling anti-fouling paint additives with slow-release characteristics. A w/o type dispersion were elaborated with the aqueous phase of gelatin, urea, silver-nitrate and formaldehyde dispersed in linseed oil. Gelatin was crosslinked by formaldehyde, together with urea for limiting the swelling of the product. Silvernitrate was reduced with the assistance of gelatin and formaldehyde into homogenously dispersed AgNPs. The microparticles and embedded AgNPs were visualized by scanning and transmission electronmicroscopy. Encapsulated AgNPs with ~18nm crystallite size were identified by X-ray powder diffraction. Characterization of gelatin-urea-formaldehyde polymer matrices was carried out by attenuated total reflectance FTIR spectroscopy. Silver dissolution from microparticles and paints with AgNP-containing microparticles was measured by inductively coupled plasma spectrometer and resulted in highly sustained release, compared to unmodified gelatin microparticles and paints containing uncapsulated silver salts. A seven month-long fouling experiment run in natural sweetwater media showed that solvent-based acrylic paint with AgNPs-containing gelatinous microparticles as additives offered resistance against biofouling at low Ag-release ratio.

Bakteriobójcza aktywność koloidów srebra stabilizowanych hydrolizatami skrobiowymi oraz ich wpływ na wytrzymałość zapraw cementowych

“…Biopolimery zbudowane na bazie peptydów (żelatyny, glutationu, keratyny) lub polisacharydów (alginianu, chitozanu, skrobi) są dobrymi środkami redukującymi jony srebra (Raveendran i Wallen, 2005;Szabó, Mihály, Sajó, Telegdi i Nyikos, 2014). Mechanizm powstawania AgNPs z udziałem węglowodanów został opisany przez Shervaniego i Yamamoto (Shervani i Yamamoto, 2011).…”

Desenvolvimento de grânulos de alginato para veiculação de derivado tiofênico 5CN06 por gelificação ionotrópica

“…Dessa forma, materiais poliméricos têm sido utilizados para na área biomédica, pois são biocompatíveis, biodegradáveis, não tóxicos, não mutagênicos e possuem atrativo custo-benefício. Como exemplo, os polímeros naturais como a gelatina (Moreira et al, 2022;Szabó et al, 2014), quitosana (Kalidason & Kuroiwa, 2022;Kazemi-Andalib et al, 2022;Roy et al, 2022) e alginato (Gonçalves et al, 2016;Trinh et al, 2021;N. Yang et al, 2015), que tem sido utilizado para sintetizar micropartículas ou grânulos de hidrogel para liberação e encapsulamento de fármacos.…”

Controlling the Release of Amphiphilic Liposomes from Alginate Hydrogel Particles for Antifouling Paint

“…Liposomes are spherical vesicles consisting of one or more lipid bilayers; their properties such as size, wettability, and surface charge depend on the lipid composition and production method. − By embedding hydrophobic molecules or polymers in the lipid bilayer, amphiphilic liposomes can be produced. Although these amphiphilic liposomes enhance the antifouling performance of surfaces coated with nontoxic paint, they are recommended to be encapsulated in protective materials such as hydrogels, polymeric microcapsules, or silica to maintain their long-term functionality in oceans. − …”