Citruses: a comparison of different oils

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How do different citrus essential oils compare in their composition and properties?

6 Comments

Comments

6 Comments

  1. Peace & Blessings Mr. Tisserand, regarding the subject of phototoxicity of certain EO’s, what is considered the time period that one would have be in the sun to trigger phototoxicity? Is there a threshhold of time one.could be safely in the sun before phototoxicity begins?

    Reply
    • This is not known exactly, and depends on other factors, but could be just a few minutes. The longer the time, the more severe the reaction would be.

      Reply
  2. Both grapefruit and sweet orange consist of 94%LIMONENE (SO DOES BITTER ORANGE). COULD YOU HELP ME UNDERSTAND WHY THE RISK OF PHOTOSENSITIVITY DIFFERS?

    Reply
    • Hi Rose, Great question! You are correct that Limonene is the main constituent in some Citrus oils and it can be confusing as some of those Citrus oils have a photosensitivity risk, while other don’t. This is because Limonene is not the constituent that causes the risk of photosensitivity. Certain oils contain molecules called furanocoumarins, and some furanocoumarins react in sunlight and UV exposure. Some common furanocoumarins that are problematic for this risk are bergapten, Psoralen, methoxsalen and oxypeucedanin. All the best, Shane

      Reply
  3. Dear Mr. Tisserand, what about cis-alpha-bergamotene and trans-alpha-bergamotene – constituents of Lemon and lime oil – are they phototoxic? And also 7-hydroxycoumarin, a constituent of a Grapefruit oil? Regarding the latter, it contains no bergapten or oxypeucedanin. Could this be an isomer of psoralen? Thank you so much, Nina

    Reply
    • Hi Nina, the bergamotene isomers are sesquiterpenes, and they are not phototoxic. 7-Hydroxycoumarin, also known as umbelliferone can be a very minor constituent of grapefruit oil and is not considered phototoxic. Expressed grapefruit oil does generally contain bergapten, and it is slightly phototoxic.

      Reply

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