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pH Shifting
PH Shifting is a widely used process that uses pH extremes to extract the proteins and specific nutrients from plants and algae. Common sports drinks with algae proteins often use precipitated plant proteins made through this method.
Normally the pH is raised greatly as chlorophyll's, plant proteins and enzymes are more soluble in a higher pH. Once the plant proteins have dissolved into the solution, organic waste and other unwanted elements are filtered out. The pH is then quickly and drastically lowered to precipitate proteins and enzymes that are now insoluble under acidic conditions (or pH is restored to neutral and precipitates are removed electronically, known as ‘isoelectric precipitation’). This a generic explanation of pH Shifting as there are variations, but all operate in a similar fashion.