In situ Raman monitoring of dielectric-heating-enhanced freeze-drying under different electromagnetic wave frequencies. Issue 16 (19th March 2019)

• Record Type: Journal Article
• Authors: Tsubaki, S.; Matsuzawa, T.; Fujii, S.; Suzuki, E.; Kanamori, H.; Hoshino, T.; Hosoda, S.; Wada, Y.
• Is Part Of: RSC advances. Volume 9:Issue 16(2019)
• Page Start: 9001
• Page End: 9005
• Publication Date: 2019-03-19
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/c9ra00981g
• Languages: English
• ISSNs: 2046-2069

Abstract

Abstract : We studied the effect of dielectric heating on the enhancement of freeze-drying by electromagnetic waves (EMWs) under different frequencies: 2.45 GHz microwaves (MWs), and 27 and 200 MHz radio frequencies (RFs). Abstract : We studied the effect of dielectric heating on the enhancement of freeze-drying by electromagnetic waves (EMWs) under different frequencies: 2.45 GHz microwaves (MWs), and 27 and 200 MHz radio frequencies (RFs). The irradiation with RFs, particularly at 27 MHz, reduced the duration of freeze-drying by 67%. We further analysed the water structure by in situ Raman spectroscopy during freeze-drying under EMWs. The phase transition from ice to water occurred soon after starting irradiation by MWs at 2.45 GHz, while the ice phase was almost maintained at an RF of 27 MHz.