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Sharmistha Sinha,Shruti S. Bandyopadhyay,Debjani Ghosh,Udipta Ranjan Chatterjee,Sudipta Saha,Pradyot K. Ghosal,Bimalendu Ray 한국식품과학회 2011 Food Science and Biotechnology Vol.20 No.4
Senna (Cassia angustifolia) is widely used in Indian folk medicine for the prevention of various disorders. Herein, we have demonstrated that water extracted arabinogalactan protein (AGP) rich fraction possesses strong antioxidative activity. The AGP rich fraction was analyzed using chemical, chromatographic, and spectroscopic methods. Effect of water extracted polymers on bovine serum albumin spectrum was determined using excitation wavelength of 282 nm. The antioxidant capacity of this fraction was studied by ferric reducing antioxidant power (FRAP) and DPPH radical assays. This polymeric fraction,≥88% of which gets precipitated with Yariv reagent,consisted mainly of (1→5)-/(1→3,5)-linked α-arabinosyl,(1→3)-/(1→3,6)-linked-galactosyl residues and terminal arabinofuranosyl residues. Its in vitro antioxidant capacity is comparable to that of standard antioxidants. Fluorescence quenching studies furnishes evidence for the interaction of the arabinogalactan protein with bovine serum albumin.
Enhanced dielectric piezo-/ferro-/electric properties of dye doped sodium acid phthalate crystal
Geeta Ray,Sonu Kumar,Nidhi Sinha,Binay Kumar 한국물리학회 2017 Current Applied Physics Vol.17 No.5
Pure and 0.1 mol% amaranth dye doped sodium acid phthalate (SAP) crystals were grown by slow evaporation technique. Doping of the dye resulted in light pink colored crystals without changing its morphology. PXRD revealed no extra peak as a result of doping. The dye doping altered Raman peak intensities due to the presence of organic functional groups. Doped crystals showed the enhanced dielectric constant value ~170. The dielectric constant showed very small variation with temperature, which is useful in high temperature dielectric and piezoelectric devices. The piezoelectric charge coefficient increased from 1 pC/N to 2 pC/N as a result of dye doping. Ferroelectric P-E loops for the grown crystals were traced at room temperature, which revealed the enhancement in polarization due to dye doping. The hardness parameters and elastic stiffness were found to decrease as a result of dye doping in SAP crystals.
Facile processes for producing robust, transparent, conductive platinum nanofiber mats
An, S.,Kim, Y.,Sinha-Ray, S.,Kim, M. W.,Jo, H.,Swihart, M.,Yarin, A.,Yoon, S. Royal Society of Chemistry 2017 Nanoscale Vol.9 No.18
<P>Mechanically robust freestanding platinum (Pt) nanofiber (NF) meshes are of great interest in applications where the corrosion resistance, malleability, and stability of a pure platinum structure must be combined with high surface area for catalysis. For photoelectrochemical applications, transparent electrodes are desirable. Several 1-dimensional (1D) Pt-based materials have been developed, but energy-intensive fabrication techniques and unsatisfactory performance have limited their practical implementation in next-generation photoelectrochemical applications. Here, we introduce relatively simple yet commercially-viable methods for creating robust, free-standing PtNF mats through combined electrospinning/solution blowing and electroplating steps. The PtNFs obtained by these processes exhibited outstanding low sheet resistance (R-s) values with reasonable transparency. In addition, the PtNFs were highly bendable and stretchable. Thus, the new methods and materials presented here hold great promise for creating mechanically robust and catalytically active transparent conducting films for diverse photoelectrochemical applications.</P>