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The (partial) replacement of synthetic polymers with bioplastics is due to increased production of conventional packaging plastics causing for severe environmental pollution with plastics waste. The bioplastics, however, represent complex mixtures of known and unknown (bio)polymers, fillers, plasticizers, stabilizers, flame retardant, pigments, antioxidants, hydrophobic polymers such as poly(lactic acid), polyethylene, polyesters, glycol, or poly(butylene succinate), and little is known of their chemical safety for both the environment and the human health. Polymerization reactions of bioplastics can produce no intentionally added chemicals to the bulk material, which could be toxic, as well. When polymers are used to food packing, then the latter chemicals could also migrate from the polymer to food. This fact compromises the safety for consumers, as well. The scarce data on chemical safety of bioplastics makes a gap in knowledge of their toxicity to humans and environment. Thus, development of exact analytical protocols for determining chemicals of bioplastics in environmental and food samples as well as packing polymers can only provide warrant for reliable conclusive evidence of their safety for both the human health and the environment. The task is compulsory according to legislation Directives valid to environmental protection, food control, and assessment of the risk to human health. The quantitative and structural determination of analytes is primary research task of analysis of polymers. The methods of mass spectrometry are fruitfully used for these purposes. Methodological development of exact analytical mass spectrometric tools for reliable structural analysis of bioplastics only guarantees their safety, efficacy, and quality to both humans and environment. This study, first, highlights innovative stochastic dynamics equations processing exactly mass spectrometric measurands and, thus, producing exact analyte quantification and 3D molecular and electronic structural analyses. There are determined synthetic polymers such as poly(ethylenglycol), poly(propylene glycol), and polyisoprene as well as biopolymers in bags for foodstuffs made from renewable cellulose and starch, and containing, in total within the 20,416–17,495 chemicals per sample of the composite biopolymers. Advantages of complementary employment in mass spectrometric methods and Fourier transform infrared spectroscopy is highlighted. The study utilizes ultra-high resolution electrospray ionization mass spectrometric and Fourier transform infrared spectroscopic data on biodegradable plastics bags for foodstuffs; high accuracy quantum chemical static methods, molecular dynamics; and chemometrics. There is achieved method performance |r| = 0.99981 determining poly(propylene glycol) in bag for foodstuff containing 20,416 species and using stochastic dynamics mass spectrometric formulas. The results highlight their great capability and applicability to the analytical science as well as relevance to both the fundamental research and to the industry.
Harnessing green chemistry for waste water remediation through Alpinia leaves silver nanoparticles
Vol 5, Issue 2, 2024
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Abstract
Addressing environmental concerns with sustainable nanomaterial is a vital step towards innovative and eco-friendly techniques that address important global issues like pollution, water contamination, and resource depletion. This eco-friendly approach offers a sustainable alternative to conventional methods and this study aims to showcase the applications of biogenic silver nanoparticles (AgNPs) synthesized using green synthesis techniques with aqueous leaf extracts from five Alpinia varieties; Alpinia purpurata, Alpinia caerulea, Alpinia zerumbet ‘variegata’, Alpinia calcurata and Alpinia zerumbet. The AgNPs were synthesized using water extracts (WE) and silver nitrate at the optimum conditions. Characterization of AgNPs using UV-Vis spectroscopy and scanning electron microscopy (SEM), confirmed their successful formation and morphology. Spherical A.zerumbet_AgNPs between 28–68 nm in size were observed. The photocatalytic activity was tested by degrading methyl Orange (MO) dye under solar irradiation and the use NaBH4 with AgNPs significantly increased the degradation of MO. P-nitrophenol catalysis using AgNP and NaBH4 resulted promising results. Cytotoxicity of AgNPs using Artemia salina was evaluated and 100% viability was seen. The antibacterial activity was conducted using Escherichia coli and Staphylococcus aureus, unlike the WEs, all AgNPs showed antibacterial activity. This study revealed that the AgNPs synthesized using Alpinia leaves has diverse functional properties, presenting a promising avenue for future research and practical applications in environmental pollution.
Keywords
References
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Prof. Hongxing Dai
Beijing University of Technology, China
