Informatics Publishing Limited

P. K. Gupta , V. V. Prabhu

Abstract

Method was optimised for quantitative determination of azadirachtin content in Neem Seed Kernel (NSK) using High Performance Liquid Chromatographic (HPLC) System. Neem fruits were collected from nine Agro-climatic zones of Rajasthan State and the samples were analysed for the azadirachtin content using this optimised method. The azadirachtin content varied from 0.194% to 0.670% by weight of neem seed kernel.

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K. S. Theagarajan , V. V. Prabhu , V. R. Sivaramakrishnan

Abstract

No abstract

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V. V. Prabhu , K. S. Theagarajan

Abstract

A modified volumetric method for the estimation of oxalic acid in Terminalia barks using standard potassium permanganate was standardised, which could he useful when a large number of bark samples are involved, as it is less time consuming than the gravimetric method and does not involve the isolation of oxalic acid by crystallization.

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V. V. Prabhu , K. S. Theagarajan

Abstract

'Cineole-rich' oi1 yielding trees exist in Eucalyptus hybrid, which cannot be distinguished from other morphologically. Refractive index of the oil and stomatal characters of the leaf were found to help in distinguishing these trees from others. Slabgel electrophoresis can be used as another useful technique to distinguish them from others in view of the characteristic differences observed in the peroxidase isoenzyme pattern of the leaves. The cineole-rich ones (above 60% cineole content) give only two bands while others give nine bands, including these two.

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S. S. Bisen , V. V. Prabhu , K. S. Theagarajan

Abstract

Eucalyptus hybrid is grown on a large scale throughout the country mainly as pulpwood and to some extent as fuelwood. The leaves of Eucalyptus hybrid go to waste at present even-through they yield essential oil containing pinenes, cineole and other aromatic chemicals. Earlier investigations showed that some of the trees yield 'cineole-rich' oil resembling that of E. globulus (blue gum). As they are morphologically indistinguishable from others, a simple and rapid test based on the relationship between refractive index and cineole content of the oil was developed to distinguish these trees from others The results of preliminary studies under light microscope supported by SEM or the epidermal features of the leaves indicate that stomatal characters such as stomatal frequency, wax plugging and raticulate cuticle can serve as useful criteria for differentiating cineole-rich ones from others. Lesser number of stomata per unit area appears to be the most important characteristic of a 'cineole-rich' leaf. This will permit screening, using equipment like LM that could be set up more easlly in the field without the need of a distillation unit and its necessary heating arrangement.

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Theagarajan , V. V. Prabhu

Abstract

Bursera penicillata (sny. B. delpechiana) commonly known as Indian Linaloe or Indian lavender is an exotic, introduced into India, and is at present one of the most important essential oil yielding plants. The essential oil is obtained from the fruit husk and the seed as such has not been put to any use at present, although it is available to the extent of about 5 tonnes every year. An examination of the seed has shown that it contains a ratty oil (17-18% yield on the wt. of the Whole seed) whose compostion has indicated that it belongs to the normal type of fatty all. The oil is composed essentially of the glycerides of the following fatty acids: myristic, palmitic, stearic, oleic and linoleic. Its physico-chemical characteristics have also been determined. It can serve as a suitable raw material for the soap industry.

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V. V. Prabhu , K. S. Theagabajan

Abstract

Large scale plantations of Eucalyptus hybrid (Mysore gum; mainly E. tereticormis) are being undertaken to meet the increasing demand of pulpwood industry. The bark of the tree has no use at present, and in view of its availability in plenty it can be used as a raw material for producing oxalic acid. Laboratory trials yielded 40-45% of oxalic acid by oxidation process. Its use in place of tannin rich bark of Terminalis species is suggested.

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