# What does light do to pineapple juice?

**URL:** <https://boards.straightdope.com/t/what-does-light-do-to-pineapple-juice/314180>\
**Category:** Factual Questions\
**Created:** [July 26, 2005, 6:36am UTC](https://boards.straightdope.com/t/what-does-light-do-to-pineapple-juice/314180 "2005-07-26T06:36:37Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Jeff\_Lichtman](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/jeff_lichtman/32/1531_2.png) [@Jeff\_Lichtman](https://boards.straightdope.com/u/Jeff_Lichtman)\
**Post date:** [July 26, 2005, 6:36am UTC](https://boards.straightdope.com/t/what-does-light-do-to-pineapple-juice/314180/1 "2005-07-26T06:36:37Z")

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A bottle of pineapple juice I got at Trader Joe’s has the following printed on the label:

“Because of its sensitivity to light pineapple juice must be packaged in an opaque container.”

So, what happens to pineapple juice if it is exposed to light?

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**Author:** ![Harmonix](https://avatars.discourse-cdn.com/v4/letter/h/3ec8ea/32.png) [@Harmonix](https://boards.straightdope.com/u/Harmonix)\
**Post date:** [July 26, 2005, 6:46am UTC](https://boards.straightdope.com/t/what-does-light-do-to-pineapple-juice/314180/2 "2005-07-26T06:46:10Z")

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Maybe it has photosynthetic bacteria in it?

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**Author:** ![ouryL](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/ouryl/32/6067_2.png) [@ouryL](https://boards.straightdope.com/u/ouryL)\
**Post date:** [July 26, 2005, 9:22am UTC](https://boards.straightdope.com/t/what-does-light-do-to-pineapple-juice/314180/3 "2005-07-26T09:22:15Z")

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Pineapple juice is actually quite acidic. It contains the enzyme bromelain which will break down with sufficient light.

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**Author:** ![carnivorousplant](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/carnivorousplant/32/3563_2.png) [@carnivorousplant](https://boards.straightdope.com/u/carnivorousplant)\
**Post date:** [July 26, 2005, 1:31pm UTC](https://boards.straightdope.com/t/what-does-light-do-to-pineapple-juice/314180/4 "2005-07-26T13:31:40Z")

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> [@ouryL](#):
>
> Pineapple juice is actually quite acidic. It contains the enzyme bromelain which will break down with sufficient light.

Is bromelain present in all bromeliads, such as Spanish moss?