Clarification of Answer by
sublime1-ga
on
13 Feb 2006 12:37 PST
mike...
This really does amount to an additional question. It may
help to keep in mind that researchers receive only 75% of
the question value. But I happen to be interested in the
question, so...
Apples contain both natural wax and commercially-added wax.
The amount that is commercially added is almost undetectable.
The natural wax contains a predominance of ursolic acid, as
noted in this lengthy discussion of apple waxes titled:
'Natural Waxes on Fruits' by P. E. Kolattukudy, Institute of
Biological Chemistry, Washington State University, Pullman.
Post Harvest Pomology Newsletter, 2(2):3-7 May 1984
http://postharvest.tfrec.wsu.edu/pgDisplay.php?article=N2I2A
Commercially-added waxes are described as follows, on the
same page:
"The wax formulations used in Washington appear to be based
either on carnauba wax or shellac or a mixture of the two.
Carnauba wax, all imported from Brazil, is obtained from
the leaves of carnauba palm. These leaves produce wax in
such abundance that flailing or heating in a little water
can yield 5-10 grams of wax from each leaf. Shellac, on
the other hand, is an insect wax. Both of these natural
waxes are complex mixtures of fatty materials and contain
some of the same components found in apple wax."
The insect source of the shellac is not discussed.
Beeswax is not used to wax apples, oranges or other produce.
It would be cost-prohibitive.
Oranges are also commercially waxed to replace natural
wax removed by washing. I expect that the same types of
wax and/or shellac would be used as are used on apples.
Given the above, I would suspect that you're having a
reaction to either carnauba, the shellac, or to the
acids contained in natural waxes as well as the fruit.
Additionally, the skin of an orange contains highly
flammable oils, to which you could be reacting.
Try this: peel off a piece of orange peel about an
inch to an inch-and-a-half long and a half inch to
three-quarters of an inch wide. Hold it lengthwise
between the thumb and forefinger of your left hand
and, while holding a lighter about a half-inch from
the middle of the outside surface of the orange peel,
squeeze the two ends of the orange peel sharply, with
the lighter lit, so that it bows out and folds in half.
You'll see a spray of a fine mist emerge from the
outer surface of the orange peel. You'll also see
that it ignites with a vengeance! These are the oils.
Washing apples is not the best way to remove the wax,
since it's waterproof. You're better off peeling the
skin off, per this PDF file on Iowa apples from Iowa
State University:
"Always wash apples before eating. If an apple is
waxed, it is better to peel off a thin layer of the
skin because waxing traps pesticide residues, which
are harmful to health."
http://www.extension.iastate.edu/Publications/PM1863.pdf
If your reaction is severe enough, I would consider
being professionally tested for reactions to carnauba
wax, ursolic acid, citric acid, pesticides, and so on.
sublime1-ga
Searches done, via Google:
apples waxed contains
://www.google.com/search?q=apples+waxed+contains
clementine oranges skin wax
://www.google.com/search?q=clementine+oranges+skin+wax