Science and Our Food Supply: Investigating Food Safety from Farm to Table

WHERE TO FIND UNPASTEURIZED JUICE 

Unpasteurized juice may be found in the refrigerated sections of grocery or health-food 

stores, cider mills, or farm markets. Unpasteurized juice must have this warning on the 

label: 

WARNING: 

This product has not been pasteurized and therefore, may contain harmful 

bacteria that can cause serious illness in children, the elderly, and persons with weakened 

immune systems. 

IF UNPASTEURIZED JUICE IS NOT AVAILABLE, PREPARE YOUR OWN 

• 

Use an unwashed fruit with soft skin that doesn’t have to be peeled, such as grapes or 

peaches. Squeezed orange juice may not work well for this lab because the low pH of 

the orange juice inhibits bacterial growth. 

• 

Do not peel the fruit, but remove any seeds or pits. Put the fruit in a blender and blend 

until you get enough juice to use with the class — about 1 to 2 cups. Strain the juice 

through cheesecloth to remove any flesh. 

Note: Purchase the same type of fruit juice that has been pasteurized. It’s more intriguing 

for the students if the two juices look identical, or at least similar. 

MODULE 3:

 PROCESSING AND TRANSPORTATION

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