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capsaicin Capsaicin profiles in hot peppers

I`ve read of few things here where people suggest that certain species of hot peppers have differing profiles of the various capsaicin family members, for example, that C.pubescens has more dihydrocapsaicin. I just found this article that suggests that this general assumption is not the case.
This paper also profiles all know capsaicins in almost 200 pepper strains.

Capsaicinoid profiles are not good chemotaxonomic indicators for Capsicum species
  • Department of Agronomy and Horticulture, New Mexico State University, Las Cruces, NM 88003, USA
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Capsaicinoids have been suggested as an aid in identifying Capsicum species. The distribution of seven capsaicinoids and their chemotaxonomic significance were examined within nearly 200 accessions of sixCapsicum species. The seven capsaicinoids were separated and quantified using high-performance liquid chromatography. The capsaicinoid profiles were not consistent when examined within a species, therefore they have limited use as a chemotaxonomic indicator. In addition, the generalization that capsaicin and dihydrocapsaicin are always the major capsaicinoids was not true, exceptions were found for some of the accessions studied.