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RTI FACT SHEET
#15
Advanced Quality Control And Standardization Technology
For Better Special Forest Products Management
Recent interest in Special Forest Product (SFP) collections has called for a need to improve the quality, efficacy, and safety of medicinal botanicals and herbal nutrient supplements. High quality and consistent SFP have customarily brought a higher market value. Clearly, the harvesters need advanced technologies for quality control and standardization for routine practice. However, due to the traditionally high cost of such technologies and overall low income among the rural SFP community, these technologies are unaffordable. Analyzing tannin content provides a promising approach to measure the quality of Special Forest Products. The main objectives for the project are: 1) To improve and guarantee both sustainability and profitability of the herbal medicine and dietary supplement industry across Pacific Northwest forest ecosystems by implementing an affordable, easily available, and simple to operate quality control and standardization tannin bioassay Technology
technology; and 2) To develop a database on tannin content for several of the most Initiative
profitable medicinal herbs, such as St. John's Wort, Echinacea, Gingko Biloba, and those with antitumor activity, harvested at specific growing locations, in specific years, under specific environmental, processing, and storage conditions. The Rural Technology Initiative provided funding to Dr. Morris Silber and Bruce Davitt to complete a feasibility study on these objectives. To approach this problem they employed a newly patented tannin bioassay and pioneered its implementation as a simple, low cost, and accurate technology for continuous quality monitoring and standardization of the herbal crops. This appears to be the first time tannin content in Echinacea and several other botanicals has been detected. Detecting tannins is of scientific and practical importance as it may explain the inconsistent pharmacological effects of St. John's Wort, Echinacea, and other herbal therapies usually reported from in vivostudies in animals and humans when administered orally. The project’s latest results show that tannin bioassay may be helpful along with assessing quality of the medicinal botanicals and also in making close predictions about their expected pharmacological activity in the body. Longer term, the laboratory bench-top tannin assay procedures should be convertible into a Tanalyzer Technology - a hand-held digital device providing multiple sample screening for tannin directly in the field.
Why Tannin? Tannins are ubiquitous in the plant kingdom. They are polyphenolic compounds and constitute
one of the most important classes of secondary metabolites in plants. When digested as part of plant food,
tannins aggressively precipitate the host's proteins. Tannins also display many other biological activities in
human and animals (anti-oxidant, anti-bacterial, anti-viral, and anti-tumor) and, therefore, are very important in
agriculture, medicine, and nutrition. Many methods for tannin detection and measurement in plants have been
proposed including chemical methods and those based on tannin’s inherent ability to precipitate proteins out
from solutions. The last group of methods is more favorable in ecological, nutrition, and bio-medical studies.
There are, however, many drawbacks and pitfalls in the protein-precipitation methods. A unique reagent,
alkaline CBB-BSA was invented (US Patent, 2000) and chemically constructed. The big advantage of this
reagent is that it can bind tightly to tannins in a concentration-dependent manner with no dye leakage. This
allows for immensely increasing the specificity, sensitivity, and accuracy of the analysis, as well as to
dramatically reduce its duration (from overnight to 15 min.) and cost (about 10 times). The method has high
feasibility proof to be modified into a hand-held digital "Tanalyzer" for in-the-field use by harvesters and pickers.
Relying on the SFP industry network in the PNW, direct contacts with harvesters were established and herbal samples were obtained. Various plant parts (organs) of the samples were analyzed for tannin content. The mean results of these analyses for some of the botanical samples are summarized in Table 1. Table 1. Specific Tannin Content (STC) in Various Medicinal Botanicals
A tannin content database is being developed on various medicinal herbs from diverse locations and environmental conditions. A categorization of data needs has been designed and a database is being assembled for future analysis and study of PNW forest ecosystem medicinal plants. A series of experiments have also been designed and completed to modify the original alkaline CBB-BSA-tannin precipitation analysis with regard to the precipitation (reaction) time. Convincing results have been obtained in laboratory experiments, which indicate that tannin-protein precipitation time may be reduced from overnight to less than an hour with no loss in tannin detection. This finding and any further modifications of the original tannin procedure will add significant value to its implementation as an "in the field" tannin detector for SFP harvesters. The capacity to provide front line technological support for PNW SFP industries is being enabled through scientific recommendations aimed at improving the standardized growing, harvesting, and processing methods so that consistently high quality herbal medicines and dietary supplements are sustainable and readily available. Contacts: For more information visit the RTI website at www.ruraltech.org or contact "Dr. Moris Silber"
silber@mail.wsu.edu and "Bruce Davitt" bbdavitt@mail.wsu.edu, Department of Natural Resource Sciences,
Washington State University, Pullman, WA
.
University of Washington
College of Forest Resources
Cooperative Forestry

Source: http://www.ruraltech.org/pubs/fact_sheets/fs015/fs_15.pdf

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