Percorrer por autor "Kirillov, Alexander M."
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- Biopolymers in seed coating for sustainable agriculturePublication . Sprey, Layanne Muniz; Fernandes, Tiago; Kirillov, Alexander M.; Sousa, Ana CatarinaThe multibillion-dollar worldwide market for coated seeds is currently seeking new sustainable solutions that promote the use of natural (biobased) polymers for developing seed coating materials produced using clean methodologies. Seed coating is an effective method widely applied in modern agriculture. By uniformly depositing a variety of active ingredients on the seed surface, it is possible to obtain coated seeds with enhanced resistance, germination, and facilitated sowing. Moreover, seed coating is an attractive option for improving crop yield, resistance to biotic and abiotic factors, and restoring degraded soil systems. Petroleum derived polymers are commercially used in seed coating, which can negatively affect plants, soil, and pollinating animals. Biopolymer seed coatings offer various advantages for reducing environmental contamination, enhancing seed protection, and enabling the addition of beneficial microbial species that promote plant growth. Such seed coatings also improve seed germination, nutrient delivery, and sowing efficiency, while reducing reliance on chemical inputs and contributing to environmentally responsible agriculture. This review highlights the growing importance of biopolymers in seed coating and summarizes their multifaceted use in sustainable agricultural systems.
- Estruturas Metalo-Orgânicas (MOFs) e Polímeros de Coordenação (PCs) no Instituto Superior Técnico: síntese e aplicações atuaisPublication . Kirillov, Alexander M.; Fernandes, Tiago; Pinto, Rosana V.; Bordonhos, Marta; Mohtar, Abeer; Pinto, Moisés L.Este artigo destaca mais de uma década de investigação no Instituto Superior Técnico (IST, ULisboa), conduzida pelos grupos de Moisés L. Pinto (CERENA) e Alexander Kirillov (CQE), com foco no design personalizado de estruturas metalo-orgânicas (MOFs) e polímeros de coordenação (PCs). Os materiais desenvolvidos revelam um enorme potencial na separação de gases, purificação do ar e em aplicações biomédicas, incluindo a libertação controlada de gases terapêuticos e propriedades antimicrobianas. Estes exemplos ilustram como o controlo preciso da estrutura destes materiais permite criar soluções para desafios atuais, abrindo caminho a tecnologias que podem transformar a indústria, o ambiente e a saúde.
- Sulfonyldibenzoate coordination polymers as bioactive dopants for polysaccharide films with antibacterial and antibiofilm propertiesPublication . Fernandes, Tiago; Macedo, Filipa; Cabral, Rafaela G.; Guiu, Telma; Franco, Chris H. J.; Jorge, Paula; Sousa, Ana Catarina; Anfré, Vânia; Cerca, Nuno; Kirillov, Alexander M.This work describes the preparation, characterization, and antimicrobial properties of bioactive silver(I) and copper(II) coordination polymers (bioCPs) and derived biopolymer materials. Two bioCPs, [Ag2(μ6-sdba)]n (1) and [Cu(μ4-sdba)H2O]n·1.5nH2O (2), were assembled from metal salt precursors and 4,4′-sulfonyldibenzoic acid (H2sdba). Both compounds were used as dopants for preparing hybrid biopolymerfilms based on agarose (AGR) or potato starch (PS) as model polysaccharide biopolymers with varying rates of degradability and silver/copper release. BioCPs and derived biopolymer films (1@[AGR]n, 2@[AGR]n, 1@[PS]n, and 2@[PS]n) with a low loading of dopant (1–5 wt%) show promising antibacterial activity against Gram-positive (S. aureus and S. epidermidis) and Gram-negative (E. coli and P. aeruginosa) bacteria. Silver doped biopolymer films also totally impair the formation of bacterial biofilms, with undetectable biofilm cells in several cases (∼7.5 log or 99.99999% inhibition). By reporting new bioCPs and biopolymer films obtained from renewable polysaccharides, this multidisciplinary work extends the application of coordination compounds as components of hybrid functional materials with antimicrobial properties and prospective biomedical relevance.