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Ecofriendly synthesis of monodispersed silver nanoparticles using Andean Morti?o berry as reductant and its photocatalytic activity
摘要： Morti?o (Vaccinium floribundum Kunth) berry is an endemic fruit from the Andes region and rich in vitamins, polyphenolic and anthocyanin compounds. The present report describes the Morti?o berry extract mediated biosynthesis of silver nanoparticles and their photocatalytic evaluations. The conditions for the synthesis of silver nanoparticles were optimised by adjusting amount of berry extract, pH, and time. Biosynthesis of silver nanoparticles was primarily identified by the appearance of yellow colour and confirmed by measurements of UV-visible spectroscopy. Particle size distribution, morphology and crystalline nature of silver nanoparticles were characterised by transmission electron microscopy, dynamic light scattering, and X-ray diffraction techniques. All characterisation technique reveals that the generated silver nanoparticles were stable, non-aggregated, monodispersed, spherical shape with an average size of 20.5 ± 1.5 nm and face centred cubic in nature. In order to evaluate photocatalytic activity, degradation of methylene blue dye by silver nanoparticles under sunlight was used as model system. It showed photocatalytic activity against methylene blue dye (5 mg/L, k= 0.00707788 min-1), efficiently. This ecofriendly approach highlighted the importance of Morti?o berry in green nanotechnology and generates a new scope of other Andean fruits in engineering applications.
关键词： Photocatalysis,Ecofriendly,Phytochemicals,Morti?o berry,Transmission Electron Microscopy,Silver nanoparticles
更新于2025-09-23 15:21:21
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Color Development and Phytochemical Changes in Mature Green Chili (Capsicum annuum L.) Exposed to Red and Blue Light-Emitting Diodes
摘要： Exposure of mature green ‘Takanotsume’ chili fruit to blue and red light-emitting diodes (LEDs) was investigated. The red LED accelerated the red color development of chili as indicated by higher a* and chroma values, as well as lower hue angle and total chlorophyll compared to the blue LED and darkness (control). These were linked to increases in β-carotene, free-capsanthin and total carotenoids. The carotenoid biosynthesis-related genes: lycopene-β-cyclase (Lcyb), β-carotene hydroxylase (CrtZ), and capsanthin/capsolubin synthase (Ccs) were up-regulated by the red LED after 2 days of the experiment. The blue LED was more effective in increasing the expression of the phytoene synthase (Psy) gene at day 1 of experiment. The total phenolic, vitamin C content, and antioxidant capacity were also higher in the blue LED-treated chili. Results suggest that the responses of each carotenoid-related gene to the light wavelengths and the accumulation of phytochemicals are specific characteristics of this chili cultivar.
关键词： phytochemicals,carotenoids,LEDs,carotenoid biosynthesis,mature green chili,Antioxidant
更新于2025-09-12 10:27:22
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Photocarcinogenesis & Photoprotection || UVR-Induced Epigenetic Regulation and Photocarcinogenesis
摘要： The human skin remains under constant exposure of solar radiation and is vulnerable to epigenetic modifications that later may develop skin cancer. The effects of chronic UVR exposure to skin can alter epigenetic information in epidermal cells, leading to epigenetic mosaicism. These epigenetic changes include DNA methylation, chromatin modifications, and posttranscriptional modifications of noncoding RNAs. UVR-induced epigenetic changes are not irreversible. Certain phytochemicals can potentially inhibit cancer signaling pathways which are usually deregulated by epigenetic mechanisms. Indeed, recent therapeutic strategies are directing toward phytochemical-based reversal of epigenetic modifications to combat UVR-induced skin cancers. This chapter provides detailed insights of different epigenetic alterations, their role in photocarcinogenesis, and phytochemical-based reversal of epigenetic changes occurring in UVR-irradiated skin.
关键词： Phytochemicals,Ultraviolet,MicroRNA,DNA methylation,Histone
更新于2025-09-04 15:30:14