Sankhadip Bose

Natural dyes are now-a-days very common for every cloth industry because the harmfulness of synthetic dyes on the skin of human beings. In cotton, silk and also in wool these colours are stable and very much eco-friendly to human skin. So now, several attempts are taken by the scientists through out the world to isolate natural dyes from different vegetables and flowers. Here in this study an attempt has been taken to isolate natural dyes from the flowers of Hibiscus rosa-sinensis. In the result, three different colours like blue, purple and green were prepared from the above said flowers and they are well stable on cotton cloths after washing by hot water and soap too. The intensity of the three colours are also high, they are bright and really eco-friendly to the human skin.

Asparagus racemosus and Centella asiatica are two very common and well known medicinal plant available in India. Both the plants are traditionally used as antiamoebic drugs. Not only are those, both the drugs used as the herbal treatment of several diseases of human beings. In between them some are really critical disease. Several important phytoconstituents have been already isolated and characterized from both the plants and in between them some are the major active marker for the treatment of above said critical diseases. Instead of all those characters, these two plants have very potent antioxidant property. Here, we have taken an attempt to prepare a formulation of the mixture (50:50) of the aqueous extracts of both the plants and compare the antioxidant property of that formulation and extracts. In this study calcium chloride cross linked alginate microsphere and chitosan coated microsphere have been prepared by using the above said plant extracts and the anti-oxidant property of those formulations were compared with the extracts and also standard drugs. The result therefore reflects that the antioxidant potency of the combined extract entrapped in formulations was almost equivalent to the original extract combinations. This entails despite of the different process control stresses in the manufacturing steps the potency of the polymer entrapped drug substances does not changed. So researchers may look forward in further purification of the extract and then an effective drug loading to get an equivalent potent action from the same quantity of a standard antioxidant.