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Chalmungra is common name of tree Hydnocarpus kurzii, belonging to family Flacourtiaceae. This tree is native to India, Myanmar and Thailand. In India this tree is mainly found in Assam and Tripura.
The seeds of tree provide an oil which is known as Chalmungra Oil. The ripe seeds contain about 40-45% fixed oil. This oil is extracted by pressing the kernels in hydraulic press. Chalmungra Oil tastes acrid and bitter. It has yellow to brownish colour. It contains chemically esters of unsaturated fatty acids of chaulmogric acid (27%), hydnocarpic acid (48%) and glycerides of palmitic acids.
In Ayurveda, Chalmungra Oil is used for treating leprosy and other skin diseases from time immemorial. The oil is used both internally and externally. This oil was introduced into Western medicine by English doctor Frederic John Mouat in 1854. Mouat acquainted with this oil while he was a professor of medicine at the Bengal Medical College. He tested this oil on leprosy patients and found good results. He dressed the external ulcers of the patients with the oil. Internally, he gave a pill prepared by beating the seeds into a pulp. He reported that the ulcers healed and the patients improved.
Chalmungra is botanically known to the world as Taraktogenos kurzii/ Hydnocarpus kurzii/ Hydnocarpus wightiana/ Hydnocarpus laurifolia,Hydnocarpus oil;Gynocardia oil and its Sanskrit name is Tuvrak, Tuvaraka and Kushtavairi. This tall tree is a limb of the Achariaceae plant family. The essential oil is extracted from the Chalmungra seeds through steam distillation method.