Food Science/Sugar Preservation

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Question
I'm trying to determine the amount of sugar needed to make buttercream and ganache nonhazardous at room temperature. Is there a standard ratio, such as 3 parts sugar to one part other ingredients?  I know most standard frostings are shelf-stable because of the high sugar content, but I can't find the numbers behind the silence. Thanks so much for your help!

Answer
Colleen,
     I can't give you a ratio.  What you need to accomplish is to have water activity of 0.7 or less.  With most icing this is easy as you have lots of sugar and limited water.  Unless you have an icing containing a large amount of water I do not think you have a problem.  Hope this if helpful.

Carl

Food Science

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Carl Hoseney

Expertise

Properties and structure of cereal grains. Milling of grains and their processing into food or feed. The chemistry of cereal grains and what happens as grains are processed.

Experience

15 years with USDA as a research chemist. 25 years as a professor at Kansas State University and 3 years as President of R&R Research Services, Inc.

Publications
Mainly Cereal Chemistry but many others also




Education/Credentials
PhD in cereal chemistry

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