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What is the solubility index for NDM?
The solubility index was developed by the American Dairy Products Institute. It measures the amount of product sediment after the application of low centrifugal forces under specified conditions—a high value indicates that the product is less soluble. Following are maximum values for various types of Non-fat Dry Milk (NDM).

This method may also be used to measure the solubility of dry whey, dry buttermilk and dry whole milk powder. Other methods for determining solubility of dairy proteins include the Nitrogen Solubility Index (NSI) and the Protein Dispersibility Index (PDI). NSI has been accepted as an international standard by the International Dairy Federation.

Solubility Index - Specifications for US Grades of nonfat dry milk

 

Extra Grade

Standard Grade

Instant NDM

1.0 ml

N/A

Regular NDM

1.25 ml

2.0 ml

High-Heat NDM

2.0 ml

2.5 ml

Roller-Dried NDM

15.0 ml

15.0 ml

United States Standards for Grades of Nonfat Dry Milk (Spray Process); USDA, AMS – Dairy Division, February 2, 2001

United States Standards for Grades of Nonfat Dry Milk (Roller Process); USDA, AMS – Dairy Division, May 18, 1984

United States Standards for Grades of Instant Nonfat Dry Milk; USDA, AMS – Dairy Division, February 2, 2001

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