What are water-extractable proteins?

The measurable amount of proteins, in terms of micrograms or milligrams, produced by water extraction on natural rubber latex gloves. ASTM D5712 and EN455-3 provide an analytical test for determining the amount of total water-extractable protein associated with natural rubber and its products. The test method involves an extraction and precipitation procedure followed by an assay of protein content (Modified Lowry Protein Assay).