Whether you’re canning, drying, or freezing your seasonal
produce, you’ve probably come across a line in the directions that tell you to
“pre-treat to prevent browning.” Have you ever wondered how that pre-treater
actually works, or why the produce browns to begin with? Probably not, but I
needed something to write about today, and this is what came to me. Feel free
to nap. I won’t notice.
Enzymes
In light-colored fruits such as apples and peaches, an
enzyme called polyphenol oxidase can turn the cut fruit to an unappetizing
shade of brown within minutes when exposed to the air. Basically, the enzyme
combines with air to start the process of decomposition. I told you it was
unappetizing. Anyway, this process is called oxidation and needs an
anti-oxidant to deactivate the enzyme and stop the oxidation process causing
the browning. Even though canned foods that are processed in airtight jars are
no longer exposed to the air, the ugly enzyme is still active and reacts with any
oxygen still left in the fruit, which is why you still need to treat fruit that
will be stored in airtight containers.
Browning Prevention Solutions
Dipping cut fruit in an acidic solution or cooking it
deactivates the polyphenol oxidase enzyme. However, some of these solutions as
well as cooking the fruit can change the flavor unfavorably. Also, remember
that time is your friend. Although some solutions work with just a quick dip of
the fruit, some take ten minutes or more to work.
Ascorbic Acid (Vitamin
C) – Ascorbic acid is probably the most effective acid for preventing
browning, and it isn’t known for adding any off flavors. Ascorbic acid is
available as a powder in many canning or freezing sections of you favorite big
box store or as Vitamin C tablets in the vitamin section of your favorite
pharmacy or natural food store.
Applications: sprinkle
powder directly on the fruit or crush tablets into a fine powder and toss with
cut fruit, coating the cut ends well. Or dissolve 1 tablespoon or 6 crushed tablets
in 1 gallon of water. Soak fruit in the solution at least 15 minutes. Drain
fruit before using. Does not need to be rinsed.
Citric Acid –
Citric acid is not quite as effective as ascorbic acid, but it’ll get the job
done without leaving any off flavors behind. It is available as a powder at
many drugstores or in the specialty food section of large supermarkets. Citric
acid is also used in both cheesemaking and winemaking and readily available in
ships specializing in cheesemaking or winemaking supplies.
Application:
Dissolve 1 tablespoon of citric acid powder in 1 gallon of water. Soak cut
fruit for at least 15 minutes. Drain fruit before using. Does not need to be
rinsed.
Ascorbic/Citric Acid
Blends – Blends of ascorbic and citric acid are readily available at most
stores that offer other canning ingredients like pectin. These blends are very
effective at preventing browning and do not need leave behind off flavors;
however, they may also contain other ingredients besides ascorbic and citric
acids like dextrose (sugar).
Application: Use
of these blends varies according to the manufacturer, but, for the most part,
you can sprinkle these powders directly on the cut edges of the fruit or mix 1
tablespoon of powder with 1 gallon of water and soak fruit for at least 15
minutes. Drain fruit before using. Does not need to be rinsed.
Lemon or Lime Juice
– Lemon and Lime juice contain both ascorbic and citric acid, but are not as
effective as the powdered ascorbic acid and may add their own flavors to the
fruit.
Application: Toss
cut fruit with undiluted lemon or lime juice, coating the cut edges completely.
Or mix 2 tablespoons of lemon juice with 2 quarts of water and soak fruit for
15 minutes. Drain well before using. Does not need to be rinsed but may leave
behind lemon or lime flavor.
Salted Water – The
salt will disrupt oxidation but will also leave behind a bit of a salty flavor.
Application: Dip
cut fruit in salty water for 10 seconds. I do not have a salt-to-water ratio
for this one, just the University of Missouri’s information that it’ll work.
Drain. If you try this experiment, let me know if rinsing made a difference.
Ginger Ale – Ok,
this one was an unexpected find and a pretty interesting idea. Obviously, the
soda will leave behind a flavor, but I don’t think it would be unpleasant.
Application: Soak
cut fruit in undiluted ginger ale for at least 10 minutes. Since all of the
other solutions require 15 minutes of soaking, I’d probably do the same here
just to be on the safe side. Drain. Does not need to be rinsed.
Blanching –
Cooking deactivates enzymes but also changes flavor and texture of the fruit or
vegetable. Blanching is used more often for preserving vegetables than for
preserving fruit.
Application: Drop
fruit into boiling water for 2 minutes. Then drop immediately in ice water to
stop the cooking process.
Fruits and Vegetables
Most light-colored fruits will call for pre-treating when
preserving, but a few vegetables are helped with a little pre-treating, too.
Some of the most commonly treated fruits are apples, peaches, nectarines,
bananas, pears, and apricots, and mushrooms and potatoes are a couple of
vegetables that really benefit from being treated before canning or
dehydrating.
Thanks for stopping by! I hope you found this information
helpful during this busy season of canning, freezing, and drying, especially
when your usual solution isn’t available or working as well as you’d hoped.
Until I did all of this research, I just reached for the pre-treater on the
grocery shelves. I had no idea it also contained sugar! I think it’s time to
make a change. By the way, all of this information was gathered from the
Universities of Illinois, Missouri, and Alabama and Clemson University
Cooperative Extensions. I am always amazed at the wonderful information readily
available at the extension office!
Grace and peace be
yours in abundance,
Betty
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Frugal by Choice's Mostly Homemade Monday
Frugally Sustainable's Frugal Ways, Sustainable Days
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We are THAT Family's Works for me Wednesday
GNOWFGLINS Simple Lives Thursday
Shared on Dandelion House's Farm Girl Friday
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