Browsing by Author "Jeevanandam, Jaison"
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- Enhanced alpha-amylase inhibition activity of amine-terminated PAMAM dendrimer stabilized pure copper-doped magnesium oxide nanoparticlesPublication . Jeevanandam, Jaison; Gonçalves, Mara; Castro, Rita; Gallo, Juan; Bañobre-López, Manuel; Rodrigues, João; Gonçalves, Mara; Castro, Rita; Rodrigues, JoãoThe present work aims to prepare copper-doped MgO nanoparticles via a sol-gel approach and study their antidiabetic alpha-amylase inhibition activity with undoped MgO nanoparticles. The ability of G5 amine terminated polyamidoamine (PAMAM) dendrimer for the controlled release of copper-doped MgO nano particles to exhibit alpha-amylase inhibition activity was also evaluated. The synthesis of MgO nanoparticles via sol-gel approach and optimization of calcination temperature and time has led to the formation of nanoparticles with different shapes (spherical, hexagonal, and rod-shaped) and a polydispersity in size ranging from 10 to 100 nm with periclase crystalline phase. The presence of copper ions in the MgO nanoparticles has altered their crystallite size, eventually modifying their size, morphology, and surface charge. The efficiency of dendrimer to stabilize spherical copper-doped MgO nanoparticles (ca. 30 %) is higher than in other samples, which was confirmed by UV–Visible, DLS, FTIR, and TEM analysis. The amylase inhibition assay emphasized that the dendrimer nanoparticles stabilization has led to the prolonged enzyme inhibition ability of MgO and copper doped MgO nanoparticles for up to 24 h.
- Gelatin-based ballistic gel formulated with phytosynthesized nanocellulose from Arundo donax for alpha-amylase enzyme inhibition activityPublication . Jeevanandam, Jaison; Castro, Rita; Rodrigues, João; Castro, Rita; Rodrigues, JoãoArundo donax, an indigenous plant in the Mediterranean region, has affected the growth of native vegetation as an invasive plant, ultimately reducing soil quality and affecting the food chain in several areas of the world. Thus, the present work aims to obtain cellulose from the A. donax leaf extract via organosolv fractionation and bleaching method, followed by centrifugal fractionation to yield nanocellulose of moderately monodispersed (0.428 PDI) 91.2 nm in size and a zeta potential of -35.5 mV of high stability in aqueous medium (water). In addition, the resultant nanocellulose was formulated in ballistic gelatin hydrogel, and their antidiabetic effect via alpha-amylase enzyme inhibition activity was also investigated. Systematic characterization of the hydrogel samples (different volume ratios of gelatin and nanocellulose) revealed that the sample with 18:2 (v/v) gelatin: nanocellulose content is thermally stable until 152 ◦C, releasing nanocellulose for three days from hydrogel until 45 ◦C. This study confirms the feasibility and potential of utilizing invasive plant species to extract nanocellulose for medical purposes. Furthermore, the gelatin-formulated nanocellulose, with its demonstrated alpha-amylase inhibition activity at a dosage of 80 µg/mL, holds the promise of being a potential revolutionary medical gummy for sustained reduction of blood glucose levels.
- Sustainable synthesis of bionanomaterials using non-native plant extracts for maintaining ecological balance: a computational bibliography analysisPublication . Jeevanandam, Jaison; Rodrigues, João; Rodrigues, Joãolternative approach to synthesizing less or nontoxic nanomaterials, compared to conventional physical and chemical approaches. Among these biological methods, plant-mediated approaches (phytosynthesis) are reported to be highly beneficial for large-scale, nontoxic nanomaterial synthesis. However, plant-mediated synthesis of nanomaterials using native plant extract can lead to bioprospecting issues and deforestation challenges. On the other hand, non-native or invasive plants are non-indigenous to a particular geographic location that can grow and spread rapidly, ultimately disrupting the local and endogenous plant communities or ecosystems. Thus, controlling or eradicating these non-native plants before they damage the ecosystem is necessary. Even though mechanical, chemical, and biological approaches are available to control non-native plants, all these methods possess certain limitations, such as environmental toxicity, disturbance in the nutrient cycle, and loss of genetic integrity. Therefore, non-native plants were recently proposed as a novel sustainable source of phytochemicals for preparing nanomaterials via green chemistry, mainly metallic nanoparticles, as an alternative to native, agriculture-based, or medicinal plants. This work aims to cover a literature gap on plant-mediated bio nanomaterial synthesis with an overview and bibliography analysis of non-native plants via novel data mining and advanced visualization tools. In addition, the potential of non-native plants as a sustainable, green chemistry-based alternative for bionanomaterial preparation for maintaining ecological balance, the mechanism of formation via phytochemicals, and their possible applications to promote their control and spread were also discussed. The bibliography analysis revealed that only an average of 4 articles have been published in the last 10 years (2013–2023) on non-native/invasive plants for nanomaterial synthesis, which shows the significance of this article.