2.3.2. ORP measurement
The primary measure of oxidative degradation of raw juice is
expressed in terms of the oxidation–reduction potential (ORP),
which was measured with an ORP meter. ORP measures the degree
of oxidation or reduction (reduction is absence of oxidation and is
similar to anti-oxidant power) of a water-based substance, and the
typical ORP scale ranges from 1200 (strongly reducing) to +1200
(strongly oxidizing.).