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Low humidity air and radiofrequency wave based sequential drying of Rosmarinus officinalis for improvement of quality.

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Relation http://ir.cftri.res.in/14860/
https://doi.org/10.1016/j.indcrop.2021.113303
 
Title Low humidity air and radiofrequency wave based sequential drying of
Rosmarinus officinalis for improvement of quality.
 
Creator Sandhya, R. Shewale
Umesh Hebbar, H.
 
Subject 04 Medicinal Plants
02 Drying and Dehydration
 
Description Rosemary (Rosmarinus officinalis L) is an aromatic herb and used worldwide for its medicinal as well as for
flavoring properties. The present investigation explores the sequential combination of low humidity air (LHA)
and radiofrequency (RF) waves for drying of rosemary for improvement of product quality. The two sequential
drying approaches were studied, namely, RF followed by LHA (RF + LHA), and LHA followed by RF (LHA + RF)
in comparison with hot air (HA), LHA at 40 ◦C, and RF (1.8 A, 40 ◦C) drying alone. Quality of dried rosemary was
estimated in terms of retention of volatiles and phytochemicals and compared with freeze-dried (FD) product.
The LHA + RF sequential approach significantly reduced the drying time by 60 % and 40 % as well as energy
consumption by 27 and 40 % compared with HA and LHA drying, respectively. RF drying required the shortest
drying time (120 min) but produced an inferior quality product. The LHA + RF dried rosemary had bright green
color and retained higher content of essential oil (86 %), ascorbic acid (81 %), polyphenols (88 %), carnosic (81
%) and rosmarinic acid (76 %) compared with RF + LHA. Oxygenated monterpenes represented 60 % of volatile
compounds and α-pinene, eucalyptol, camphor, D-verbenone were majorly contributing to rosemary flavor. A
principal component analysis demonstrated that rosemary dried by LHA + RF had higher volatiles and quality
close to FD. Overall, results provide a basis for potential application of sequential drying using LHA + RF for
energy-efficient and accelerated drying of other heat-sensitive herbs with better preservation of phytochemicals
and volatile compounds.
 
Date 2021
 
Type Article
PeerReviewed
 
Format pdf
 
Language en
 
Identifier http://ir.cftri.res.in/14860/1/Shewale2021.pdf
Sandhya, R. Shewale and Umesh Hebbar, H. (2021) Low humidity air and radiofrequency wave based sequential drying of Rosmarinus officinalis for improvement of quality. Industrial Crops & Products, 162. p. 113303.