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Gupta, Amita
- Extraction of Beta Carotene from Selected Dried and Fresh Samples of Vegetables
Authors
1 Rungta College of Engineering and Technology, Raipur (C.G.)
Source
Asian Journal of Research in Chemistry, Vol 6, No 2 (2013), Pagination: 169-171Abstract
Fresh and dried vegetable samples were chosen for the extraction of beta carotene laboratory method was chosen to perform experiment . In present investigation dried vegetable were used for the extraction of beta carotene .Data of samples were compared with fresh sample of Beta carotene. It is a phytochemical helping people in reducing many diseases using it along with their daily diet.
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- Phytochemical Evaluation of Extracts of Stem of Eclipta alba (Bhringaraja)
Authors
1 Department of Chemistry, College of Pharmacy, IFTM, Moradabad, (U.P.), IN
2 School of Pharmaceutical Sciences, Jaipur National University, Jagatpura, Jaipur, (Rajasthan), 302025, IN
Source
Research Journal of Pharmacology and Pharmacodynamics, Vol 1, No 3 (2009), Pagination: 134-139Abstract
This paper deals with the detailed phytochemical evaluation of the stem of Eclipta alba (Bhringaraja) family: (Compositae). The preliminary phytochemical screening shows that different extracts of plant have different constituents like carbohydrate, alkaloids, phenolics, steroids, glycosides, fat and oils. TLC of the hexane extract after column extraction was shown Rf value 0.78 in Petroleum ether:Hexane:Chloroform:Methanol, used as mobile phase in 2:4:2:1 ratio and TLC of pet. Ether extract also shown Rf value is 0.72 in Petroleum ether:Hexane:Chloroform, used as mobile phase in 4:3:1 ratio after column extraction. This is evaluated by the instrumental analysis (UV, IR, and NMR) of hexane and pet. Ether extract. They shows consequently that pet. Ether extract contains alkane (2940 Cm-1, δ 0.827), alkene (1630 Cm-1, δ 1.253-1.351), monomer of aliphatic acid (1760 Cm-1 δ 2.169), aromatic amine (1570 Cm-1, δ 2.593) etc. and hexane extract contains alkane (2940 cm-1, δ 0.801-0.873) alkene (1625 Cm-1, δ 0.988-1.075) aldehyde (1740 Cm-1, δ 2.154 – 2.288) and aromatic alcohol (1110Cm-1, δ 5.324). These data suggests that the extracts (pet. ether and hexane) may have the glycoside, aliphatic acid, steroids, fats and oils. They are pharmacologically important.Keywords
Eclipta alba, Flavanoids, Glycosides, Thin Layer Chromatography.References
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- Fabrication of Nano-Piezoelectric Thin Films for MEMS Applications
Authors
1 Solid State Physics Laboratory (SSPL), DRDO, Delhi, IN
Source
Manufacturing Technology Today, Vol 13, No 12 (2014), Pagination: 3-5Abstract
Piezoelectric thin films are an important family of functional materials in MEMS because they can provide electro- mechanical conversion directly and thus are useful for all kinds of motion sensors, actuators, transducers and acoustic devices. Most important factor for piezoelectric based MEMS devices is integration of functional piezoelectric layer onto the Si-substrate. Mainly we have two challenges, first is integration of piezoelectric functional films onto Si-substrate on wafer scale at low temperature and second is the patterning/ etching of the piezoelectric films with the resolution down to micrometer range. With an ever-expanding demand for data storage, transducers, actuators and MEMS systems applications, materials with superior ferroelectric and piezoelectric responses are of great interest. However, these film show high energy loss and low piezoelectric response compared with bulk materials, mainly due to the clamping effect of substrates and limited film thickness effect. One effective approach to resolving this problem is to fabricate nano domain thin films with a preferential crystallographic orientation that results in large piezoelectric deformation.
Highly textured nano-piezoelectric thin films were fabricated for MEMS application. The PZT films were characterized for micro-structural and electrical properties. We observed the piezoresponse in the range of 60 pm/V in PZT films. We propose to use these films for piezoelectric energy sourcing devices. It has been reported that common environmental vibrations such as those found in a building exhibit moderate amplitudes (<1g), and lower frequencies, typically between 60 Hz - 200 Hz, and fabrication of piezo thin film based micro-cantilevers vibrating at these frequencies might fulfill the requirements for a continuous power source of ~ 10 μW for a typical MEMS chip.