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A Modified Method for Determining Tannin–Protein Precipitation Capacity Using Accelerated Solvent Extraction (ASE) and Microplate Gel Filtration

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Abstract

The protein precipitation assay used by Robbins et al., (1987) Ecology 68:98–107 has been shown to predict successfully the reduction in protein availability to some ruminants due to tannins. The procedure, however, is expensive and laborious, which limits its utility, especially for quantitative ecological or nutritional applications where large numbers of assays may be required. We have modified the method to decrease its cost and increase laboratory efficiency by: (1) automating the extraction by using Accelerated Solvent Extraction (ASE); and (2) by scaling and automating the precipitation reaction, chromatography, and spectrometry with microplate gel filtration and an automated UV–VIS microplate spectrometer. ASE extraction is shown to be as effective at extracting tannins as the hot methanol technique. Additionally, the microplate assay is sensitive and precise. We show that the results from the new technique correspond in a nearly 1:1 relationship to the results of the previous technique. Hence, this method could reliably replace the older method with no loss in relevance to herbivore protein digestion. Moreover, the ASE extraction technique should be applicable to other tannin–protein precipitation assays and possibly other phenolic assays.

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Authors and Affiliations

  1. Department of Biology, University of Alaska Anchorage, 3211 Providence Dr., Anchorage, AK, 99508, USA

    Scott H. McArt & Donald E. Spalinger

  2. Department of Chemistry, University of Alaska Anchorage, 3211 Providence Dr., Anchorage, AK, 99508, USA

    John M. Kennish

  3. Alaska Department of Fish and Game, Division of Wildlife Conservation, 1800 Glenn Highway, Suite 4, Palmer, AK, 99645, USA

    William B. Collins

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  1. Scott H. McArt
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  2. Donald E. Spalinger
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  4. William B. Collins
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Correspondence to Scott H. McArt.

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McArt, S.H., Spalinger, D.E., Kennish, J.M. et al. A Modified Method for Determining Tannin–Protein Precipitation Capacity Using Accelerated Solvent Extraction (ASE) and Microplate Gel Filtration. J Chem Ecol 32, 1367–1377 (2006). https://doi.org/10.1007/s10886-006-9089-9

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  • DOI: https://doi.org/10.1007/s10886-006-9089-9

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