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 inomparison to the untreated dried samples. Similarly, Rawson et al.obtained higher carotenoids content in dried carrots subjected for three minutes of ultrasound with an amplitude of 24.4 and 42.7 micrometer and achieved an increase of carotenoids extractionby 6% and 14%, respectively, in comparison to untreated dried material.