How can you prevent milk from spoiling?

By Mikayla Schroeder

Introduction

 In some households, milk spoils faster than it can be used. The quicker the milk spoils, the more milk is wasted. The more milk wasted, leads to more money wasted due to the necessity to purchase fresh milk. The more constant the temperature stays the longer it will take to spoil. If milk has been left at room temperature for longer than 2 hours, the safest rule is to throw it out. The process of rapidly heating raw milk, holding it for a short specified period of time, then rapidly cooling it, removes most of the bacteria from milk, thus helping it last longer. Some of the remaining harmless bacteria can grow and multiply, although very slowly, at refrigerator temperatures, eventually causing the products to spoil.
 

Hypothesis

I believe that if you boil your milk and add baking soda before you refrigerate it, it will extend the milks life before the expiration date.

Materials Needed

• 6 Pints of Milk

• Clean Pot

• 1 tablespoon of Baking soda (sodium bicarbonate)

• 1 tablespoon of Salt

• stove

• refrigerator

 

Method

• Variable A of milk I placed in the refrigerator untouched.
• I then added ½ tablespoon of Baking soda to Variable B of milk, then place it in the fridge.
• I then added ½ tablespoon of salt to Variable C of milk, then place it in the fridge.
• I then let the stove preheat for 10 minutes at 350 degrees.
• I then poured   Variable D of milk into the pot and placed it on the stove until it started to boil.
• Then I placed the funnel inside the original milk bottle and poured the milk back inside and placed it inside the refrigerator
• I then boiled Variable E of milk, once it started to boil I removed it from the heat and added ½ tablespoon of baking soda.
• Then I placed the funnel inside the original milk bottle and poured the milk back inside and placed it inside the refrigerator.
• I did the same thing to Variable F of milk but added ½ tablespoon of salt instead of baking soda.
• I monitored ever pint by use by date, appearance, texture and smell daily.

Conclusion

After careful examination my hypothesis had proven to be true, But Boiling milk did prove to last longer. Adding Salt also had a longer lasting effect, almost at the same rate as the baking soda.

Review of literature

LifeHacker. (August 17, 2011) Are you throwing out milk to early?

    http://lifehacker.com/5831809/are-you-throwing-out-milk-too-early

This Article describes guidelines of checking to see how long milk will last as well as others ways to checking if it is spoiled.

 

Zeenews. (August 26, 2011) Tips that come in handy in kitchen

http://lifehacker.com/5831809/are-you-throwing-out-milk-too-early

This article states that adding baking soda will help prevent milk from spoiling.

 

Home And Family (N/A) Keeping Milk and Cream Fresh

    http://www.homefamily.net/keeping-milk-and-cream-fresh/

    This article describes what casues milk to spoil, as well as ways of preventing it from

happening.

 

Review of literature

 

Wish She (Febuary 24, 2010) How to Prevent Milk from Spoiling

    http://www.wiseshe.com/2010/02/how-to-prevent-milk-from-spoiling.html

    This article states adding baking soda to milk will help it from spoiling.\

 

Home Food Safety (N/A) Keep Your Dairy and Egg Products Safe

    http://homefoodsafety.org/refrigerate/dairy-eggs

    This article describes different containers effecting the lifespan of your milk.

 

WedMD (N/A) What Milk Can Do For You

    http://www.webmd.com/food-recipes/what-milk-can-do

    This Article describes the benefits of having milk in your diet.