3.2. Processing impact towards the extraction selectivity of rosmarinic, carnosic and ursolic acids
The extracts compositions are compared in Fig. 4, according to HRE, ultrasound and microwave assisted extraction. It can be noted that among the three compounds of interest, CA and UA (from 5.5 to 15.4 mg/g rosemary and 20.5–35.3 mg/g rosemary respectively) are predominantly extracted on RA (from 0.4 to 2.2 mg/g rosemary), no matter the extraction technology. These proportions can be attributed to the extraction solvent used, since RA is more soluble in water whereas CA and UA are more soluble in ethanol [27]. Differences among the extraction are however noticed according to the extraction process used.
3.2. Processing impact towards the extraction selectivity of rosmarinic, carnosic and ursolic acidsThe extracts compositions are compared in Fig. 4, according to HRE, ultrasound and microwave assisted extraction. It can be noted that among the three compounds of interest, CA and UA (from 5.5 to 15.4 mg/g rosemary and 20.5–35.3 mg/g rosemary respectively) are predominantly extracted on RA (from 0.4 to 2.2 mg/g rosemary), no matter the extraction technology. These proportions can be attributed to the extraction solvent used, since RA is more soluble in water whereas CA and UA are more soluble in ethanol [27]. Differences among the extraction are however noticed according to the extraction process used.
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