Journal of the American Oil Chemists' Society

, Volume 83, Issue 10, pp 847–854

Characterization of cold-pressed onion, parsley, cardamom, mullein, roasted pumpkin, and milk thistle seed oils

  • John Parry
  • Zhigang Hao
  • Marla Luther
  • Lan Su
  • Kequan Zhou
  • Liangli (Lucy) Yu
Articles

DOI: 10.1007/s11746-006-5036-8

Cite this article as:
Parry, J., Hao, Z., Luther, M. et al. J Amer Oil Chem Soc (2006) 83: 847. doi:10.1007/s11746-006-5036-8

Abstract

Cold-pressed onion, parsley, cardamom, mullein, roasted pumpkin, and milk thistle seed oils were characterized for their fatty acid (FA) composition, tocopherol content, carotenoid profile, total phenolic content (TPC), oxidative stability index (OSI), color, physical properties, and radical-scavenging capacities against peroxyl (oxygen radical-scavenging capacity) and stable DPPH (diphenylpicrylhydrazyl) radicals. Parsley seed oil had the highest oleic acid content, 81 g/100 g total FA, and the lowest saturated fat among the tested oils. Roasted pumpkin seed oil contained the highest level of total carotenoids, zeaxanthin, β-carotene, cryptoxanthin, and lutein at 71 μmol/kg and 28.5, 6.0, 4.9, and 0.3 mg/kg oil, respectively. Onion seed oil exhibited the highest levels of α- and total tocopherols under the experimental conditions. One of the parsley seed oils exhibited the strongest DPPH scavenging capacity and the highest oxygen radical absorbance capacity (ORAC) value of 1098 μmol Trolox equiv/g oil. However, ORAC values of the tested seed oils were not necessarily correlated to their DPPH scavenging capacities under the experimental conditions. The highest TPC of 3.4 mg gallic acid equiv/g oil was detected in one of the onion seed oils. The OSI values were 13.3, 16.9–31.4, 47.8, and 61.7 h for the milk thistle, onion, mullein, and roasted pumpkin seed oils, respectively. These data suggest that these seed oils may serve as dietary sources of special FA, tocopherols, carotenoids, phenolic compounds, and natural antioxidants.

Key Words

Antioxidant carotenoid fatty acid composition OSI phenolic radical scavenging activity seed oil tocopherol 

Copyright information

© AOCS Press 2006

Authors and Affiliations

  • John Parry
    • 2
  • Zhigang Hao
    • 1
  • Marla Luther
    • 2
  • Lan Su
    • 2
  • Kequan Zhou
    • 2
  • Liangli (Lucy) Yu
    • 2
  1. 1.Analytical Sciences DepartmentColgate-Palmolive CompanyPiscataway
  2. 2.Department of Nutrition and Food SciencesUniversity of MarylandCollege Park

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