Effects of drying method on the extraction yields and quality of oils from quebec sea buckthorn (Hippophae rhamnoides L.) seeds and pulp

The effects of air-drying and freeze-drying on the extraction yields and quality of oils from Quebec sea buckthorn (cv. Indian-summer) seeds and pulp were studied. Oil extractions were carried out using hexane. Air-dried (ADS) and freeze-dried (FDS) seeds, gave a similar extraction yields (similar to 12% w/w), whereas those of air-dried (ADP) and freeze-dried (FDP) pulps were significantly different (35.9 +/- 0.8 vs. 17.1 +/- 0.6% w/w). Fatty acid analysis revealed that alpha-linolenic (37.2-39.6%), linoleic (32.4-34.2%) and oleic (13. 1 %) acids were the main fatty acids in seed oils, while pulp oils were rich in palmitoleic (39.9%), palmitic (35.4%) and linoleic (10.6%) acids. Lipid fractionation of crude oils, obtained by solid phase extraction (SPE), yielded mainly neutral lipids (93.9-95.8%). The peroxide values of seed and pulp oils were ca. 1.8 meq/kg and between 3.0 and 5.4 meq/kg, respectively. The melting behavior of seed and pulp oils showed multiple endothermic transitions, as observed normally in vegetable oils. (C) 2007 Elsevier Ltd. All rights reserved.