http://localhost:8080/xmlui/handle/123456789/216 2026-04-14T16:10:15Z 2026-04-14T16:10:15Z Harsha, N Priya, R Ranya, K R Shukla, S Biju, S Reddy, M L P Warrier, K G K http://localhost:8080/xmlui/handle/123456789/2531 2017-06-02T10:35:51Z 2011-08-01T00:00:00Z

Title: Morphology-Dependent Correlation Between Photoluminescence and Photocatalytic Activity of Anatase– Titania Photocatalyst Authors: Harsha, N; Priya, R; Ranya, K R; Shukla, S; Biju, S; Reddy, M L P; Warrier, K G K Abstract: Nanocrystalline particles and nanotubes of anatase–titania photocatalyst have been processed via sol–gel and hydrothermal methods, and subsequently surface-modified by depositing silver/ silver oxide via ultraviolet-reduction technique. The samples have been characterized using different analytical techniques for determining their morphology, structure, specific surface-area, moisture-adsorption, photoabsorption, and photoluminescence. The photocatalytic activity, under the ultraviolet-radiation exposure, has been measured in an aqueous solution using the methylene blue as a model catalytic dye-agent and is compared with the photoluminescence intensity variations in air under different processing conditions for the two different morphologies of anatase–titania photocatalyst. It has been demonstrated that the conventional correlation between the photoluminescence and photocatalytic activity is highly morphology-dependent and is not obeyed by the nanotubes of anatase–titania. This has been primarily attributed to the change in the mechanism of photo-induced electron trapping in air and aqueous media, which controls the variation in the PL intensity and photocatalytic activity, as typically observed here for the pure and silver-deposited nanotubes of anatase–titania.

2011-08-01T00:00:00Z Ajithabai, M D Rameshkumar, B Jayakumar, G Luxmi Varma Mangalam S Nair http://localhost:8080/xmlui/handle/123456789/2525 2017-06-02T10:35:12Z 2011-12-01T00:00:00Z

Title: Molecular and Crystal Structure of 8-Acetoxy Goniofufurone from Goniothalamus Wyanaadensis, Bedd Authors: Ajithabai, M D; Rameshkumar, B; Jayakumar, G; Luxmi Varma; Mangalam S Nair Abstract: Lactones, sterol, acetogenin and alkaloid are isolated for the first time from Goniothalarnus wyanaadensis, Annonaceae. Structures are elucidated by spectral studies. Single crystal X-ray diffraction data of 8-acetoxy goniofufurone is reported.

2011-12-01T00:00:00Z Prathapan, A Fahad, K Thomas, B K Riya, M P Raghu, K G http://localhost:8080/xmlui/handle/123456789/2524 2017-06-02T10:32:23Z 2011-05-01T00:00:00Z

Title: Effect of Sprouting on Antioxidant and Inhibitory Potential of Two Varieties of Bengal Gram (Cicer arietinum L.) Against Key Enzymes Linked to Type-2 Diabetes Authors: Prathapan, A; Fahad, K; Thomas, B K; Riya, M P; Raghu, K G Abstract: Type 2 diabetes is a chronic metabolic disease, and the current treatment for type 2 diabetes targets oxidative stress and postprandial hyperglycemia via the inhibition of α-glucosidase and α-amylase, key enzymes linked to type 2 diabetes. In the present study, two varieties of sprouted and non-sprouted Bengal gram (white coated and brown coated) extracts were assayed for total phenolic content, DPPH radical scavenging activity, total antioxidative capability and the inhibition of α-glucosidase and α-amylase activity. Sprouting increased the total phenolic content in both the varieties of Bengal gram and exhibited significant DPPH radical scavenging activity and antioxidant capability compared with that of non-sprouted Bengal gram. Sprouting also increased the inhibitory potential of Bengal gram against α-glucosidase and α-amylase compared with the non-sprouted variety. The overall results suggest that increased antioxidant and inhibitory potential of sprouted Bengal gram against α-glucosidase and α-amylase makes them desirable for dietary management/prevention of diabetes. This finding also provides essential information for the development of sprouted Bengal gram-derived antidiabetic products.

2011-05-01T00:00:00Z Harsha, N Ranya, R Shukla, S Biju, S Reddy, M L P Warrier, K G K http://localhost:8080/xmlui/handle/123456789/2523 2017-06-02T10:32:53Z 2011-03-01T00:00:00Z

Title: Effect of Silver and Palladium on Dye-Removal Characteristics of Anatase-Titania Nanotubes Authors: Harsha, N; Ranya, R; Shukla, S; Biju, S; Reddy, M L P; Warrier, K G K Abstract: Anatase-titania nanotubes have been synthesized via hydrothermal and surface-modified by depositing silver and palladium via ultraviolet-reduction method. The pure and surface-modified anatase-titania nanotubes have been characterized using the transmission electron microscope, selected-area electron diffraction, X-ray diffraction, diffuse reflectance, photoluminescence, and Fourier transform infrared spectroscope to reveal their average size, structure, and surface-chemistry. The nanotubes have been utilized for the dye-removal application involving the surface-adsorption mechanism under the dark-condition and photocatalytic degradation mechanism under the ultraviolet-radiation exposure. The variation in the dye-concentration during the dye-adsorption and photocatalysis processes has been determined using the ultraviolet-visible absorption spectrophotometer with methylene blue as a model catalytic dye-agent. It has been shown that silver-deposited anatase-titania nanotubes are more effective in enhancing the kinetics of the dye-removal via surface-adsorption and photocatalytic degradation mechanisms relative to the palladium-deposited anatase-titania nanotubes, which has been attributed to the differences in the surface-chemistry of anatase-titania nanotubes induced by the respective metal-deposition.

2011-03-01T00:00:00Z