Bilberry
Extract Laboratory Guidance Published by ABC-AHP-NCNPR Botanical Adulterants
Program
Quality consortium’s second Lab Guidance Document reviews 39 laboratory methods
for the analysis of bilberry extract to ensure proper identity and detection of
possible adulterants
(Austin, Texas, August 12, 2015) The
ABC-AHP-NCNPR Botanical Adulterants Program announces the publication of its
new Laboratory Guidance Document (LGD) on Bilberry (Vaccinium
myrtillus) fruit extract. This is part of the Program’s
new series of comprehensive, authoritative, extensively peer-reviewed, and
up-to-date summaries and assessments of laboratory analytical methods for
authentication of the identity of botanical ingredients and detection of the
potential presence of known adulterants.
The
Program’s bilberry LGD is the second publication in its Laboratory Guidance Document series for botanical
ingredients. It follows January’s inaugural
LGD publication on skullcap (Scutellaria
lateriflora) herb. There is ample evidence from published and unpublished
laboratory reports that both of these herbs are subject to adulteration in the
US and international markets.
The
LGDs are intended for use by quality control personnel and lab technicians in
the herbal medicine, botanical ingredient, and dietary supplement sectors of
industry to help them choose the most appropriate techniques and methods for
their specific analytical needs.
The
LGDs are available to members of industry, researchers, health professionals,
and the general public at no cost as part of the Botanical Adulterants
Program’s policy of producing freely available educational documents on
adulteration, made possible through funding by the Program’s underwriters and
supporters.
The
American Botanical Council (ABC)-American Herbal Pharmacopoeia (AHP)-National
Center for Natural Products Research (NCNPR) Botanical Adulterants Program (BAP) is an
international consortium of nonprofit organizations, analytical laboratories,
professional scientists, industry members, professional and trade
organizations, and others that advises industry, researchers, health
professionals, and the public about the various challenges related to adulterated
herb and botanical ingredients sold in commerce. To date, more than 165
American and international parties have financially supported or otherwise
endorsed the Program. “For
the first several years of our Program, we published articles alerting members
of the herb industry about adulteration of specific herbs,” said Mark
Blumenthal, founder and executive director of the American Botanical Council
and director of the BAP. “Now, in addition to our soon-to-be-enhanced series of
publications on adulterated herbs, we are offering technical resources to
assist industry and third-party laboratories to detect adulteration and help
prevent adulterated botanical ingredients and extracts from being processed
into finished consumer products.”
The
ABC-AHP-NCNPR Laboratory Guidance Documents are intended to provide reliable,
expert guidance on suitable methods to comply with the mandated requirements of
testing for identity, purity, strength, and composition outlined in the US Food
and Drug Administration’s current
Good Manufacturing Practices (cGMPs) for dietary supplements, as
well as government-mandated GMPs in other countries. Per the US cGMPs, it is
the responsibility of the dietary supplement manufacturers to “conduct at least
one appropriate test or examination to verify the identity of any component
that is a dietary ingredient.”1
The
Program’s LGDs provide information about the most suitable analytical methods
for detection of certain adulterants and authentication of specific botanical
materials in the form of whole, cut, or powdered raw materials, extracts, and
essential oils. Conclusions are based on a thorough review of available
analytical methods (e.g., from official and unofficial compendia, as well as
the peer-reviewed literature) and input from peer reviewers from academia,
government, and industry in multiple countries. The Bilberry Fruit Extract LGD
was peer-reviewed by 16 such experts. The primary assessment of each method is
based on its performance characteristics (i.e., suitability in detecting known
adulterants, if they are present in a
tested material); labor and analysis time comprise the secondary evaluation
criteria.
Stefan
Gafner, PhD, ABC chief science officer and BAP technical director, emphasized
the importance of having a solid analytical method to evaluate bilberry raw
materials and finished products: “Based on comments from dietary supplement
ingredient suppliers and manufacturers, the adulteration of bilberry extracts
is a big concern in the herbal industry. Bilberries are a rich source of
anthocyanins — naturally occurring blue-purple pigments with antioxidant and
other beneficial properties found in many fruits and berries — but
manufacturing a high-quality bilberry extract is very expensive due to the high
cost of bilberries. People who intend to cheat have a number of cheaper
anthocyanin sources available, making the discovery of adulteration sometimes
challenging. Therefore, it is important to use an analytical method that is
specific enough to detect the potential adulterants.”
The
BAP’s LGDs begin with a statement of purpose and scope in regard to the
particular plant species covered, followed by a short overview of the botanical
nomenclature of the species and its known adulterants. Also included are
sections on analytical techniques (generally including macroscopic,
microscopic, chemical, and genetic assays) and a phytochemical composition
overview of the species and known adulterants. The LGDs conclude with a concise
table of strengths and limitations of the various assays. Complete references
are provided with links to original source documents. The
next LGD scheduled to be released by the ABC-AHP-NCNPR Botanical Adulterants
Program is on the detection of black cohosh (Actaea racemosa) adulteration.
For
the bilberry extract LGD, 39 analytical
methods were evaluated, including macroscopic analysis,
botanical microscopy, HPTLC, HPLC/UHPLC, and UV/Vis spectrophotometry.
“The review is accurate and it is a valuable guidance on
analytical methods to authenticate bilberry extracts and to detect
adulteration,” commented
Roberto Pace, PhD, director of quality control at Indena S.p.A. in Milan,
Italy, after reviewing the bilberry LGD. “I deem it
will be one of the main references on the analytics of bilberry.”
To
date, the ABC-AHP-NCNPR Botanical Adulterants Program has published five
extensively peer-reviewed and referenced articles on the history of
adulteration, adulteration of the herbs black cohosh and skullcap, and
adulteration of bilberry fruit extract and so-called “grapefruit seed extract.”
These open-access articles are available on the Program’s webpage. The Program
also publishes a quarterly e-newsletter, the “Botanical
Adulterants Monitor,” that highlights new scientific publications
related to botanical authenticity and analysis to detect possible adulteration,
recent regulatory actions, and Program news. Reference
1.
US Food and Drug Administration. Code of Federal Regulations Title 21, Volume
2, Part 111 (21CFR111): Current Good Manufacturing Practice in Manufacturing,
Packaging, Labeling, or Holding Operations for Dietary Supplements. Available
at: www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfCFR/CFRSearch.cfm?CFRPart=111.
Revised April 1, 2014. Accessed July 22, 2015.
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