Abstract—Pine (Pinus pinea L.) have been used as a folk medicine for various health problems. As sustainable resource utilization methods become increasingly important, alternative methods have being investigated for evaluation of agricultural residues. The aim of this study is to recover phenolic substances that constitute the majority of antioxidants from dry pine needles by using sub-critical water extraction with and without ultrasound-assistance. The experiments were carried out at pressure of 10 to 20MPa and the effects of extraction temperature (60–200 °C) and water flow rate (1–5 ml/min) were investigated. The results showed the most suitable extraction condition to determine highest amount of phenolic compounds was found to be at 180°C and at the flowrate of 3 ml/min. Hereby, new process alternatives were projected and results were discussed. Hence, the present study investigated the influence of ultrasound assistance on extraction of phenolic compounds and their physico-chemical characteristics. 
 

Index Terms—pine needles, extraction, supercritical fluids, ultrasound extraction, phenolic compounds

Cite: Ruhan Aşkın Uzel, "Impact of Ultrasound-Assisted Extraction on Supercritical Recovery of Valuable Compounds from Dry Pine Needles," International Journal of Food Engineering, Vol. 4, No. 1, pp. 8-13, March 2018. doi: 10.18178/ijfe.4.1.8-13