Выражение встречается в следующем контексте:
Conversely, extruding at an elevated temperature can adversely affect the nutritional quality of the product as measured for example by increased lysine blockage and browning of the product.
И еще:
At the same time, the nutritional quality of products made by the process of the invention (expressed for example in terms of lysine blockage) is found to be comparable to the same products produced by spray drying.

Заранее спасибо