Carotenoid content in dried material treated with ultrasound at
a frequency of 21 kHz for 10 and 20 min increased by 22% and 44%,
respectively, compared to the fresh material. Lower frequency
(21 kHz) and shorter treatment resulted in better retention of the
carotenoids in the dried samples, whereas the use of the frequency
of 35 kHz before drying, resulted in better retention of carotenoids
only after 10 and 30 min. The ultrasound application at 35 kHz for
20 min did not cause significant change of carotenoid content in
comparison to the untreated dried samples. Similarly, Rawson
et al. [29] obtained higher carotenoids content in dried carrots subjected
for three minutes of ultrasound with an amplitude of 24.4
and 42.7 lm and achieved an increase of carotenoids extraction
by 6% and 14%, respectively, in comparison to untreated dried
material.
Carotenoid content in dried material treated with ultrasound ata frequency of 21 kHz for 10 and 20 min increased by 22% and 44%,respectively, compared to the fresh material. Lower frequency(21 kHz) and shorter treatment resulted in better retention of thecarotenoids in the dried samples, whereas the use of the frequencyof 35 kHz before drying, resulted in better retention of carotenoidsonly after 10 and 30 min. The ultrasound application at 35 kHz for20 min did not cause significant change of carotenoid content incomparison to the untreated dried samples. Similarly, Rawsonet al. [29] obtained higher carotenoids content in dried carrots subjectedfor three minutes of ultrasound with an amplitude of 24.4and 42.7 lm and achieved an increase of carotenoids extractionby 6% and 14%, respectively, in comparison to untreated driedmaterial.
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