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Effect of pulsed electric fields on yield and chemical composition of rose oil (Rosa damascena Mill.)

Affiliation
German Institute of Food Technologies , Quakenbruck , Germany
Tintchev, Filip;
Affiliation
Institute for Roses and Aromatic Plants , Kazanlak , Bulgaria
Dobreva, Ana;
GND
140592741
Affiliation
Julius Kühn-Institute (JKI), Institute for Ecological Chemistry, Plant Analysis and Stored Product Protection, Germany
Schulz, Hartwig;
Affiliation
German Institute of Food Technologies , Quakenbruck , Germany
Toepfl, Stefan

To improve the comparatively low oil yield, pulsed electric fields have been applied on fresh rose blossoms with an energy input of 10 kJ/kg as well as 20 kJ/kg. It was reported a rise in yield of 2- 46 %, additionally the distillation time could be reduced. An increase of ratio terpene alcohols/hydrocarbones from 33 % to 285 % was observed in treated rose oil. To elucidate the influence on petal structure, scanning electron microscopy was used. The determination of yield increase, chemical composition and olfactory evaluation showed that a pulsed electric fields treatment at 10 kJ/kg was optimal with regard to product yield and quality.

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