Extraction Technologies for Medicinal and Aromatic ... - Capacity4Dev

EXTRACTION TECHNOLOGIES FOR MEDICINAL AND AROMATIC PLANTS
with only treated water going out of the battery limits. This treated water has
very low biochemical oxygen demand (BOD) and chemical oxygen demand
(COD), which is another bonus for the processor.
8.7 Conclusions
Various new technologies for effi cient and cost-effective extraction
of medicinal and aromatic plants have been discussed. Microwave-assisted
extraction (MAE) is highly effi cient for obtaining extracts under mild
conditions. MAE is particularly important since the active components which
are thermally labile can be recovered without any damage. The loss of valuable
aroma components in steam distillation condensates is estimated to
be of the order of US$ 50 million per year from aroma oils for India alone.
Two types of separation processes – adsorptive and membrane-based pervaporation
– are useful in recovering practically all the oil that is lost with the
condensate water. The recovered oil can be sold as such or blended with the
main oil fraction to yield a much more natural aroma and hence a high value.
This recovered oil will be a big bonus even for the marginal farmer and hence
this approach needs to be seriously considered.
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