compounds [19–25]. Among all applications, UAE is nowadays considered as the most feasible and economically profitable largescale application of ultrasound in the food field [26].The aim of this study was to enhance the extraction of oligosaccharides from selected fruits and vegetables by application of ultrasound assisted method. To optimize the extraction conditions,that is the type and the concentration of solvent, extraction time and ultrasound temperature, response surface methodology(RSM) was used. Ultrasound extraction under optimized conditions was performed to look into the individual fractions of fructooligosaccharides(FOS) such as 1-kestose (GF2), nystose (GF3), and 1F-b-fructofuranosylnystose (GF4) as well as raffinose family oligosaccharides(RFO) such as raffinose and stachyose. Furthermore, a comparison between conventional extraction method and ultrasound assisted extraction was conducted. To our knowledge there have been no published data on ultrasound extraction of oligosaccharides and their subsequent analysis for individual fractions.