Extraction and quantification of rosmarinic acid in lemon balm (Melissa officinalis L.)
This study aimed to determine the optimal method for extracting rosmarinic acid (RA) from lemon balm using pressurized liquid extraction (PLE). Additionally, the effect of filtration during sample preparation on the concentration of rosmarinic acid (RA) was investigated. Moreover, the RA content was compared in various lemon balm samples including: commercial dried lemon balm, commercial lemon bal