Studies on methods of dehydration of rose buds 'gold medal' and 'Minu Parle'
2013
Acharyya, P. | Biswas, S. | Saha, S. | Chakraborty, L.
There is a considerable demand for dried rose (Rosa hybrid) bud in the domestic Indian market, as well as in the global market. In the eastern parts of India flowers are available in abundance with good shape during the winter months. However, during the summer months, flowers are available but not in the standard shape, and the fresh cut flowers also do not stay for long if not sufficient care is provided. Different methods of dehydration were used for production of dried rose buds of the cultivars 'Gold Medal' (golden yellow) and 'Minu Parle' (maroon red). Flowers of 5-cm stalk length were embedded in different media, viz., silica gel, white sand, sawdust or combinations of sand-boric acid (1:1, v/v) or sawdust-boric acid (1:1, v/v) and dried in an open air room, hot air oven or microwave oven for different durations. The optimum drying duration was considered on the basis of color retention and post drying shape, form and texture, which varied greatly due to the different conditions and media. The moisture loss was 65-66% for both cultivars. In both cultivars, the silica gel-embedded buds exhibited the best performance in respect to early drying, retention of color, shape and texture of the flowers dried in microwave oven followed by hot air oven. Drying duration was similar for the two cultivars; however, ‘Gold Medal’ had a better color retention and overall acceptability. A maximum size reduction was obtained with sawdust alone. Post-drying longevity studies revealed that the microwave-dried buds embedded in silica gel exhibited a longer shelf life than buds treated with the other treatments.
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