feedthebear
Well-Known Member
ilikestuff said:I've just heard that pasturizing leads to all of the fruit not being usable by gelatanizing it because of the heat binding the simple sugars into more complex ones. Maybe it just makes it take a little more time, I bet fresh fruit does taste better.
Pasturizing only heats the fruit to a high enough temp to kill any wild yeast and bacteria that may be living on it. It isn't warm enough to change the sugars. Pasturizing can be done as low as 145F for 30 minutes. Or it can be done for as short as 5 minutes at boiling (blanching). The hotter the temperature, the more pectin haze you may get. The longer in the water, the more sugars, aroma, color will transfer from the fruit to the water instead of going into the beer.
For putting fruit in the primary, it definitly needs to be pasturized or blanched. Thats why a lot of fruit in the primary recipies call for putting the fruit when the wort is around 160F. Its being pasturized by the hot wort.
For putting fruit in the secondary, pasturizing is not quite as important. The beer already has alcohol in it. The alcohol will usually kill off any wild bacteria and yeast before they have time to cause problems in the beer. Personally, I'd rather be safe than sorry.