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Are there any way to preserve the juice of lemon for, say, one week without a change in its taste?

Even deep-freezing it makes it little bit bitter!

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up vote 5 down vote accepted

I do not think that there is a better way they not to squeeze the lemon until you need them :D

Regardless, if you want to do testing and are concerned about the bitter notes that develop , I recommend doing the research with grapefruit instead as it turns bitter is a matter of minutes and has a much stronger bitter flavor then the lemons do. That way you at least have a shorter turn around time.

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No, not really. Pasteurization--cooking briefly at a high temperature to kill nasty bugs--changes the flavour of citrus fruits immeasurably. Just juice your lemons as needed.

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You need to freeze them and You can find all tips here

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