Comparison of Two Methods of Solvent Extraction of Phenolic Compounds from Pomegranate (Punica granatum L.) Peels

Authors
P. Rahnemoon 1
M. Sarabi Jamab 1
M. Javanmard Dakheli 2
A. Bostan 3
O. Safari 4
1 Department of Food Biotechnology, Research Institute of Food Science and Technology (RIFST), Mashhad, Islamic Republic of Iran.
2 Department of Food Technology, Iranian Research Organization for Science and Technology ‎‎(IROST), Tehran, Islamic Republic of Iran.
3 Department of Nanotechnology, Research Institute of Food Science and Technology (RIFST), Mashhad, Islamic Republic of Iran.
4 Department of Fishery, Faculty of Natural Resources and Environment, Ferdowsi University of Mashhad, Mashhad, Islamic Republic of Iran.
Abstract
The present study aimed to evaluate effectiveness of Superheated Solvent Extraction (SSE) compared with instant Controlled Pressure Drop (DIC) assisted Solvent Extraction (DIC-SE) on total phenolic, flavonoids, and anthocyanins compounds from pomegranate peels. The effects of temperature, extraction time, and water:ethanol ratio for SSE method, and temperature and heating time for DIC-SE were studied. The highest phenolic compounds, flavonoids, and extraction yields by SSE was achieved at 160˚C, ethanol: water 50:50 and 20 minutes, subsequently in the DIC-SE, the most effectiveness was approached at 150˚C for 5 seconds (P< 0.05). The SSE improved the total phenolic compounds (563.16±1.04 mg g-1), anthocyanins (285.11±1.02 mg 100 g-1), extraction yield (68.7%) and shortened the extraction times compared to DIC-SE, but flavonoid content was more in DIC-SE extract (439.07±0.05 mg g-1). Based on HPLC analyses, gallic acid was not detected in any of the obtained extracts, but the amount of ellagic acid and punicalagin A and B in DIC-SE extract was higher than SSE. The current study clearly shows that the SSE is an effective extraction method to obtain phenolic compounds and the DIC is an advantageous pretreatment for extraction of flavonoids from pomegranate peels.

Keywords

Subjects

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Journal of Agricultural Science and Technology
Volume 20, Issue 5
July and August 2018
Pages 939-952