We have considered what aloe is, how aloe materials are processed how the products are effected by processing and how the chemistry of aloe materials change during processing. Our focus will shift slightly to describe the chemical tests commonly used to analyze aloe and we will exemplify the types of data these tests yield. None of these analyses directly indicate biological activity but they are surrogate markers for such activity, since when they are low or absent, so is biological activity. These tests are not common for process control in the aloe industry. We will therefore spend most of this section examining typical test data on finished products. This will be oriented toward a description of suitable aloe material, in contrast to bad aloe, and what fraudulent and/or adulterated material looks like. In particular, we will emphasize the usefulness of multiparameter analysis for determining the quality and identity of aloe materials (Pelley etal, 1993; Waller etal, 1994; Pelley etal, 1998). This concept suggests that in material as complex as aloe, a single given analytical system may commonly yield values outside the 2C limit on a given sample. However, when multiple parameters fall outside their 2C limits, the sample is either degraded beyond recognition or fraudulent.
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