Lemon juice

[lebmung]

In shops there are those Bio/Organic Italian 100% lemon juice, or even Japanese Yuzu juice.
On the ingredients they say 100% juice, no chemicals added so no preservatives.
How do they preserve the juice?
Hihj heat treatment? In this case vitamin C an half of flavonoids are dristroyed.
How can one preserve the juice naturally?

[Vlad]

Citrus juice is quite acidic and acid inhibits the growth of bacteria and fungi. This is one reason why vinegar is used for pickling vegetables.

[Bomand]

I have good results freezing juice. I juice lemons, limes and kumauats. Juice them, fill ice cube trays with lime and lemon juice and freeze. Empty juice cubes into a large freezer bag and put in freezer. Use watever cubes you require and put bag back in freezer. I also save Kishu juice. I juice kishu in a blender, put juice on 2 quart plastic coffee container and freeze. To use, thaw in refrigerator, stir well, fill good highball glass with Kishu juice, add one large shot of Jack Daniels Single Barrel. Float 1/4 inch of heavy cream on top and report to the pier or veranda. Watch sun go down. Other than adding preservatives  there is little hope of long term storage of citrus juice without considerable loss of flavor and nutrients.

[brian]

Maybe they are pasteurized?   If you read the history of citrus juice and scurvy on wikipedia it says originally rum was added to preserve it, then sugar (Rose’s).  Pasteurization wasnt common until much later.  UHT pasteurized milk is good for months

[lebmung]

Maybe they are pasteurized?   If you read the history of citrus juice and scurvy on wikipedia it says originally rum was added to preserve it, then sugar (Rose’s).  Pasteurization wasnt common until much later.  UHT pasteurized milk is good for months

I thought about it, but they don't have the UHT packaging. Glass with a metal lid.

[Ilya11]

https://www.instructables.com/id/bottled-lemon-juice/

[lebmung]

Ilya thanks for the link, but this method using heat at 90°C for 10 minutrs will distroy all vitamic C and antioxidants.
UHT is more desirable as is only for few seconds.
Also it doesn't need to be 90 ° most of bacteria dies at 65°C

[Bomand]

To my way of thinking .....any heat or additives ruins the real taste of citrus......just my opinion.

[brian]

Yeah I've had bottle lemon & lime juice and it is not the same at all. 

[Ilya11]

Ilya thanks for the link, but this method using heat at 90°C for 10 minutrs will distroy all vitamic C and antioxidants.
UHT is more desirable as is only for few seconds.
Also it doesn't need to be 90 ° most of bacteria dies at 65°C

In  home made wine preparation I use filtering for sterilization, but not sure if it will work for lemon juice.