ns buy lactose-free milk. The sell-by date is typically as lot as eight weeks from the date of purchase, i beg your pardon is in the ar of double that of constant milk. This appears puzzling; lactose-free milk, i beg your pardon still has the very same mass of sugar, has twice as numerous sugar molecules as constant milk, since all the lactose molecules have been split in to galactose and also glucose. With twice as countless sugar molecules per unit volume, one would certainly think lactose-free milk would certainly last fifty percent as long as consistent milk, not twice as long.

You are watching: How long does lactaid milk last after opened

organic-barisalcity.org everyday-barisalcity.org food-barisalcity.org
enhance this question
edited Aug 9 "15 at 18:14

14.7k1212 yellow badges5151 silver- badges8686 bronze badges
asked Aug 9 "15 in ~ 18:10

62411 gold badge44 silver badges1111 bronze title
include a comment |

1 price 1

active earliest Votes
Apparently the procedure used by manufacturers (ultra-pasteurization) to produce lactose-free milk is responsible because that the longer shelf life.

One resource reports:

Lactose-free milk is pasteurized in ~ a higher temperature than regular milk. The process, recognized as ultra-pasteurization, is draft to eliminate the bacteria content entirely, providing lactose-free milk a refrigerated shelf-life that 60-90 days, contrasted with regular pasteurized milk, which retains some bacteria. It has actually a shelf life of 1-3 weeks.

See more: Does Lipton Peach Iced Tea Have Caffeine ? The Facts About Your Favorite Beverages (U

A producer (in the joined States) of necessary dairy commodities (Organic Valley) describes ultra-pasteurization and also the extended shelf-life right here as:

Ultra Pasteurization (UP), or Ultra High Temperature (UHT) pasteurization, is the process of heating milk to around 280 °F for just 2 seconds and then chilling it earlier down rapidly. The an outcome is milk that"s 99.9% cost-free from bacteria. This pasteurization procedure creates an extended shelf-life for milk products of increase to 3 times the length as HTST pasteurization; while giving the exact same wholesome, top quality dairy product. This permits us to distribute UP milk commodities regionally and to other locations of the country that can not have accessibility to ours dairy products. This is referred to as "ultra pasteurized" ~ above the milk package. Essential Valley supplies its quarts and also some the its half gallons of milk through Ultra Pasteurization (UP).