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2023

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Sammendrag

The present investigation is aimed at developing films using biomass of seaweed Kappaphycus alvarezii blended with natural additives both without glycerol (K) and with glycerol (KG) and to use the same in enhancement of shelf life of tomatoes. The natural additives used were Azadirachta indica oil (K1), A. indica leaves extract (K2), Citrus limon leaves extract (K3), A. indica gum (K4), Prunus amygdalus gum (K5), Moringa indica gum (K6) and the extract and oil of A. indica leaves (K7). The result showed that the moisture content ranged from 10.3 ± 1.2–19.9 ± 0.4%, thickness 0.01–0.10 mm, and swelling index above 45% in all the prepared films. The tensile strength and transparency were higher for K6, KG6, K and KG respectively. KG6 and K3 films showed maximum phenolic content, antioxidant and antimicrobial activity. The promising results of current investigation proved the suitability of the film in enhancing the shelf life of tomatoes to 14 days at room temperature.

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Sammendrag

Processing of 1000 kg of fresh Kappaphycus alvarezii yielded 25 kg salt. The optical microscopy revealed non-crystalline nature, absence of geometrical pattern; while squircle aggregates with ruffled surface were evident in SEM. Caenorhabditis elegans assay confirmed its non-toxicity; while absence of Salmonella and pesticides make it safe for human consumption. Among the macro elements, ‘K' content was highest (3792.74 ± 541.23 mg 100 g−1) and ‘Ca’ was lowest (7.01 ± 1.32 mg 100 g−1); whereas among micro element ‘Fe’ was highest (6.52 ± 1.40 mg 100 g−1) and ‘Ni’ lowest (0.14 ± 0.01 mg 100 g−1). Chromium (11.5 μg g−1) was lower than a permissible daily dose, while other heavy metals (Mo, Cu, Co, Zn, As, Cd, Hg, and Pb) were below detectable level. PXRD revealed that it has only KCl Form I. The study suggested potential economic utility of seaweed salt under the framework of waste to wealth.