ABSTRACT A series of transition metal complexes having general formula [M(L1)(L2)](NO3)2, (where, M = Cu(II), Ni(II), and Zn(II)) of mixed ligands, L1 = Isonicotinamido-Thiophene-2-Carbaldimine, L2 = 1, 10-phenanthroline, were synthesized. The obtained compounds were successfully characterized by different spectroscopic techniques. Conductivity measurements indicated that all complexes were 1:2 electrolytes in nature. IR spectra indicated that ligands coordinated to metals via the carbonyl oxygen atom and the azomethine nitrogen atom. Magnetic moment values and UV-Visible spectra confirmed square planar structure around the Cu(II), and Ni(II) ions, and a tetrahedral geometry around the Zn(II) ion.The metal complexes were tested against Escherichia coli and Pseudomonas sp. Among the tested compounds, Zn(II)complex showed higher antibacterial activity over both bacterial strains against reference drug Kanamycin. Moreover, synthesized metal complexes exhibited moderate antioxidant activity than the Schiff base. Cu(II) complexes were found to be most active whereas, Zn(II) complexes showed the lowest antioxidant activity comparable to the BHT.

RESUMO Este experimento foi conduzido para estudar a eficácia de diferentes soluções conservantes na vida de vaso e na qualidade de inflorescências de angélica de corte cv. Single. As concentrações de ácido cítrico a 100, 200 e 300 mg L-1, sacarose a 3% e 4% e H2O2 a 0,1%, 0,2% e 0,3% foram utilizadas como conservantes, enquanto a água destilada foi utilizada como controle. O experimento de fator único foi desenvolvido em um delineamento completamente randomizado (CRD), com três repetições. As soluções de ácido cítrico e H2O2 inibiram efetivamente o bloqueio relacionado ao crescimento bacteriano nos tecidos vasculares, mas tiveram efeitos adversos na vida de vaso. As inflorescências armazenadas em soluções de sacarose (3% e 4%) permaneceram frescas até 10 dias após a preservação (DAP), mantendo boa absorção da solução, controlando a perda de transpiração e ganhando maior massa fresca relativa. Diferentes parâmetros de qualidade, como o diâmetro do florete e o número de floretes abertos também foram significativamente superiores para as inflorescências preservadas em solução de sacarose (3% e 4%), seguida pelo controle, ácido cítrico e H2O2, respectivamente, em diferentes DAP. De maneira geral, as inflorescências de angélicas mantidas em sacarose, particularmente em soluções a 4%, apresentaram melhor qualidade pós-colheita e maior vida de vaso em relação aos outros conservantes.

ABSTRACT This experiment was conducted to study the effectiveness of different preservative solutions on vase life and quality of angelica cut inflorescences cv. Single. The concentrations of citric acid at 100, 200 and 300 mg L-1, sucrose at 3% and 4% and H2O2 at 0.1%, 0.2% and 0.3% were used as preservatives, while distilled water was used as control. The single factor experiment was laid out in a completely randomized design (CRD) with three replications. Citric acid and H2O2 solutions effectively inhibited bacterial growth-related blockage in the vascular tissues, but had adverse effects on the vase life. The inflorescences stored in sucrose (3% and 4%) solutions remained fresh up to 10 days after preservation (DAP), maintaining good solution uptake, controlling transpiration loss and gaining higher relative fresh weight. Different quality parameters like floret diameter and number of opened florets were also significantly higher in inflorescences preserved in sucrose (3% and 4%) solution, followed by control, citric acid and H2O2, respectively, in different DAP. Overall, the inflorescence of cut tuberose preserved in sucrose, particularly at 4% solutions, showed better postharvest quality than other preservatives and maximum vase life.