Y Rajasree Rao

Mally Reddy Institute of Engineering and Technology · ELECTRONICS AND COMMUNICATION ENGINEERING

This paper gives a review of design of various antennas for Radar applications. Micro-electromechanical (MEMS) antenna, Dielectric resonator antennas, Planar Yagi-Uda antenna, rectangular waveguide aperture, multifunctional phased array and sinuous antenna are used for Radar application. The design parameters and methodology of these antennas are d...

A volatile alkaloid quinoline-4-carbonitrile (QCN) was isolated from the floral extract of Quisqualis indica. Major compounds were trans-linalool oxide (1.0, 4.5%), methyl benzoate (1.0, 4.0%), 2,2,6-trimethyl-6-vinyl-tetrahydropyran-3-one (7.4, 17.8%), 2,2,6-trimethyl-6-vinyl-tetrahydropyran-3-ol (1.0, 1.2%), (E,E)-α-farnesene (29.1, 16.1%), QCN (...

Kewda (Pandanus fascicularis Lam) essential oil was enriched with phenylethyl methyl ether (65–77%), terpinen-4-ol (13–18%) and α-terpineol (1–3%), which were definitely soluble in distillation condensate. The solubility of phenylethyl methyl ether, terpinen-4-ol and α-terpineol in water were more than 1000 ppm. Adsorption performance of single-sol...

Simarouba glauca DC is a tree of the family Simaroubaceae, which grows well up to 1,000 m above sea level in all types of well-drained soils (pH 5.5 to 8.0) and in places with 250 to 2,500 mm annual rainfall. The seed oil has been extracted both by mechanical expelling and solvent extraction. The fatty acid composition and iodine value of the oil i...

Headspace solid phase microextraction (HS-SPME) is a relatively new technique for analysis of floral volatiles. Volatile components emitted from the flowers are pre-concentrated on solid phase microextraction fiber by using field sampling manual holder. The volatiles are identified by GC-MS and percentage composition determined by GC-FID. Solid pha...

Extraction of the fresh flowers of Michelia champaca L. with liquid CO2 provided a floral extract in 1.0±0.04wt% yields. The extract so obtained contains far less waxes and is organoleptically very superior. Similarly extraction with pentane gave the so-called ‘Concrete’ in 1.58±0.06wt%. While the concrete contains co-extracted floral waxes that ma...

Murraya paniculata (Linn.) Jack syn M. exotica Linn. commonly known as orange jessamine is grown in gardens for its large clusters of fragrant flowers. Extraction of the fresh flowers with liquid CO2 provides a floral extract in 0.64% yields. The major components in the extract were phenyl ethyl alcohol (3.3%), indole (1.2%), E-nerolidol (7.6%), be...

Absolutes obtained by fractionation of the pentane extract (concrete) of flowers of Jasminum sambac L. with cold methanol or liquid CO2 were compared. Direct extraction of flowers with liquid CO2 gave a relatively fat-free and superior product in 0.44% yield. It was found that the CO2 method of fractionation of pentane extract is a practical proces...

Kewda (Pandanus fascicularis Lam) flowers are commercially hydro distilled to obtain essential oil and attars. The oil is obtained usually in 0.03 to 0.04 % depending on the season and time elapsed between harvests and processing. Extraction with hexane on the other hand provides concrete in 0.315 % yields. Hydro distillation of concrete is found t...

Kewda (Pandanus fascicularis Lam.) is an important economic plant, and its male inflorescence is used in the production of kewda perfumes. It grows wild and is also cultivated; an estimated 35 million flowers (3,500 tons) worth $10 million are processed annually in Ganjam (19.18°N, 84.51°E) India. Kewda products are used in flavoring tobacco, foods...

Quisqualis indica syn. Q. Densiflora, family Combretaceae, is a large woody, scandent shrub. The composition of the floral extract of Q. indica with subcritical CO2 is compared with that of extracts obtained by different conventional methods such as distillation with water and extraction with pentane. Absolutes obtained by fractionation of the pent...

The dried fruits of Zanthoxylum rhesta DC syn Z. budrungawall syn. Z. limonella (Dennst) are used as condiments and have spice value. While the essential oil is concentrated in the pericarp, the seeds have fatty oil. The extraction of fragrance/flavour components is carried out from the pericarp by subcritical CO2, modified methanol–subcritical CO2...

Murraya paniculata (Linn) Jack, syn. M. exotica Linn., commonly known as orange jessamine, is grown in gardens for its large clusters of fragrant flowers. Distillation of the fresh flowers in water furnished the essential oil in 0.027% yield. Extraction of the fresh flowers with pentane afforded the concrete (0.78%). Precipitating the waxes from th...

Extraction of fresh flowers of Michelia champaca L. with pentane afforded the concrete in 1.5 ± 0.05% yield. Precipitating the waxes from the concrete with methanol gave absolute (80%). Distillation of the flowers in a Clevenger-type apparatus furnished the essential oil in 0.03% yield. The chemical composition of the concrete, absolute and essenti...

The seeds of ambrette (Abelmoschus moschatus Linn), after selective extraction of fragrance from the seed coat, are flaked and extracted with hexane to obtain a fatty oil. The FA composition and iodine value of the oil indicate it possesses saturated, monounsaturated, and polyunsaturated FA in ratios close to the recommendations of the United Natio...

Extraction of male spadices of kewda (Pandanus fascicularis Lam.) flowers with hexane furnished a waxy extract, the so-called ‘concrete’. Treatment of the extract with methanol gave a reddish oily residue (‘absolute’) with a smell strongly reminiscent of the aroma of kewda flowers. Concrete, absolute and separated waxes were analysed by GC and GC–M...

Alpinia calcarata collected from Berhampur (Orissa) and Bangalore (Karnataka) India were multiplied and grown in an experimental garden in Bhubaneswar. The oils obtained from the leaves, rhizomes and roots of both the accessions were analyzed by combination of capillary GC and GC/MS. In all 85 constituents were identified constituting 81–98% of oil...

The chemical compositions of the essential oils of Tagetes patula leaf, capitula and total above ground herb collected from Farrukhnagar (28°N, 76°E), Haryana, India were subjected to analysis by GC and GC/MS. The major constituents of the oils were limonene (6.2–13.6%), (Z)-(3-ocimene (0.3–8.3%), dihydrotagetone (4.5–8.1%), terpinolene (0–11.2%),...

The essential oil of Cymbopogon microstachys produced from wild plants collected in the foothills of Manipur was analyzed by GC and GC/MS. The results showed that the oil contained (E)-methyl isoeugenol (56.4–60.7%) as the major constituent. This is the first time that an oil of C. microstachys has been found with (E)-methyl isoeugenol as the major...

Selective extraction with methanol of uncrushed ambrette seeds grown in India and liquid-liquid extraction of the residue afforded a volatile concentrate in 0.33% yield free from the fatty acids and off-notes associated with a steam-distilled oil. Analysis by GC and GC/MS revealed that it contained (E)-β-farnesene (9.8%), (E,E)-α-farnesene (7.3%),...

Analysis of the essential oil of the flowers of Jasminum sambac L. distilled in three locations in India showed that considerable variation in the composition occurred. Variation in the composition of the oil recovered from buds collected in the morning and late in the day has also been observed.

Oils obtained by hydrodistillation of the seeds of green, freshly dried and those available in the local market of large cardamom (Amomum subulatum Roxb.) were analyzed by GC and GC/MS. A total of 33 components were identified by mass spectra and relative retention indices. The major component of the oil was 1,8-cineole (81.5–86%).

The lipid and FA compositions of TAG seed oil of ambrette (Hibiscus abelmoschus), contrary to earlier reports, were found to contain only a small amount of epoxy FA. Higher HBr absorption values were shown to be due to the presence of fragrance components of the seed coat in the oil derived from intact whole seeds. Cyclopropene/cyclopropane acids i...

Physico-chemical characteristics of Simarouba glauca seed and its oil were determined and compared with literature values. The kernels provided 67% of total lipids and 56-58% hexane soluble fat. Fatty acid composition of expeller and solvent extracted fat and different lipid fractions were also determined. This is the first report of the lipid and...

The extraction of champa flowers by conventional methods and compared with the subcritical CO2 extraction. The headspace volatile composition of living flowers and after plucking was determined by solid phase micro extraction on PDMS fiber for comparison. Solvent extraction of fresh flowers of Michelia champaca with pentane yields 1.5 ± 0.05 % conc...