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There are many examples of botanical identity methodology currently in use today; all have associated levels of confidence and, hence, application for their intended purpose. This paper addresses the application of some of these methods to identify and qualify commonly traded herbs. The relevance of botanical identity and quality within the dietary supplement industry has seen a dramatic increase in the last several years, and now with the current Good Manufacturing Practices (cGMPs) recently published and the requirement for 100% identity testing, there is an increased need for reliable methods of analysis and subsequent interpretation of the results or data derived from these methods, given the diversity of samples and matrixes seen on a daily basis in a commercial setting. Example applications of methods described herein illustrate how one can confidently and effectively satisfy the 100% identity rule of the cGMPs to identify crude raw materials and their powdered or liquid extracts as well as identify a majority of such ingredients in finished products with diverse matrixes. The three techniques discussed in this paper are viewed from a qualitative perspective with primary emphasis on the application of HPTLC to a variety of complex samples with varying degrees of difficulty of analysis and interpretation. The three methods discussed are (1) HPTLC, for its fingerprint/pattern recognition capabilities as well as marker compound analysis; (2) microscopy, for identification/recognition of unique cellular, anatomic features and characteristics of the target plant or adulterants; and (3) HPLC for marker compound identification, quantitation, and/or other fingerprint qualities it may contribute to the data set. To support the applications and methods described herein, this paper presents four key approaches to assist in the interpretation of the data collected in order to correctly determine the identity of botanicals and their powdered extracts: the marker approach, the multicomponent-based approach, the pattern approach, and the multipattern approach, and how these approaches can be used with a vanguard/rearguard strategy in analytical testing as well as forming a basis for the functional fingerprint and the concept of phytoequivalence.

Fingerprint Analysis and the Application of HPTLC to the Determination of Identity and Quality of Botanicals, from an Industry Perspective