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

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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A. M. Mahmood Hussain , K. S. Theagarajan

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K. S. Theagarajan , P. S. Rao

Abstract

The leaf oil of certain trees of Eucalyptus hybrid bas been shown to contain a very high percentage of cineole (63.2-72.3%). In this respect and also in almost all other characteristics the oil compares favourably with the Australian Eucalyptus globulus oil and very much more with the Indian Eucalyptus globulus oil. This particular strain of the hybrid can, therefore, be an additional source for the medicinal eucalyptus oil, with the added advantage that the trees can grow successfully under diverse conditions of climate, soil and rainfall.

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