Propolis: Creating a Buzz as a Natural Preservative 
Food Engineering & Ingredients, 5/1/2008
http://apitherapy.blogspot.com/2008/05/propolis-creating-buzz-as-natural.html

Preservatives are an essential ingredient for most foods and beverages. Despite the effectiveness of synthetic preservatives such as sodium benzoate, consumers are increasingly demanding all-natural ingredients. Natural preservatives are therefore growing in appeal. Bee propolis, already widely known as a nutritional supplement, may represent an attractive option for food manufacturers seeking natural preservatives as a means to differentiate their products. However, differences in the composition of propolis collected by honey bees from varying regions will mean that suppliers will need to standardise their extracts. And, if the consumer is to have confidence in the product...

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