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Orhan N, Gafner S, Blumenthal M. Estimating the extent of adulteration of the popular herbs black cohosh, echinacea, elder berry, ginkgo, and turmeric - its challenges and limitations. Nat Prod Rep 2024. [PMID: 39108221 DOI: 10.1039/d4np00014e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/30/2024]
Abstract
Covering: up to July 2023Botanical natural medicinal products and dietary supplements are utilized globally for their positive impacts on health and wellness. However, the effectiveness and safety of botanical products can be compromised by unintentional or intentional adulteration. The presence of adulterated botanical ingredients in the global market has been documented in the published literature but a key question, namely what the extent of adulteration is, remains to be answered. This review aims to estimate the prevalence of adulteration in preparations made from black cohosh rhizome, echinacea root or herb, elder berry, ginkgo leaf, and turmeric root/rhizome. According to the information provided in the 78 publications retrieved for this paper, 818 of 2995 samples were reported to be adulterated and/or mislabeled. Ginkgo leaf samples (n = 533) had the highest adulteration rate with 56.7%, followed by black cohosh rhizome (n = 322) samples with 42.2%, echinacea root/herb (n = 200) with 28.5%, elder berry (n = 695) with 17.1%, and turmeric root/rhizome (n = 1247) with 16.5%. Products sold as licensed or registered herbal medicines were found to have a lower risk of adulteration compared to products sold as dietary/food supplements. The data show that the adulteration rate substantially differs from one ingredient to the other. Due to the significant limitations of the available data upon which the estimated extent of adulteration is based, and the rapidly changing botanical dietary supplement market, conclusions from the five herbs examined in this publication cannot be applied to other botanicals traded in the global market. However, the data clearly show that a substantial portion of the botanical dietary supplements do not contain what is claimed on their labels.
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Affiliation(s)
- Nilüfer Orhan
- American Botanical Council, 6200 Manor Road, 78723, Austin, TX, USA.
| | - Stefan Gafner
- American Botanical Council, 6200 Manor Road, 78723, Austin, TX, USA.
| | - Mark Blumenthal
- American Botanical Council, 6200 Manor Road, 78723, Austin, TX, USA.
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Mügge FLB, Sim CM, Honermeier B, Morlock GE. Bioactivity Profiling and Quantification of Gastrodin in Gastrodia elata Cultivated in the Field versus Facility via Hyphenated High-Performance Thin-Layer Chromatography. Int J Mol Sci 2023; 24:9936. [PMID: 37373083 DOI: 10.3390/ijms24129936] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Revised: 05/22/2023] [Accepted: 05/28/2023] [Indexed: 06/29/2023] Open
Abstract
Gastrodia elata (Orchidaceae) is native to mountainous areas of Asia and is a plant species used in traditional medicine for more than two thousand years. The species was reported to have many biological activities, such as neuroprotective, antioxidant, and anti-inflammatory activity. After many years of extensive exploitation from the wild, the plant was added to lists of endangered species. Since its desired cultivation is considered difficult, innovative cultivation methods that can reduce the costs of using new soil in each cycle and at the same time avoid contamination with pathogens and chemicals are urgently needed on large scale. In this work, five G. elata samples cultivated in a facility utilizing electron beam-treated soil were compared to two samples grown in the field concerning their chemical composition and bioactivity. Using hyphenated high-performance thin-layer chromatography (HPTLC) and multi-imaging (UV/Vis/FLD, also after derivatization), the chemical marker compound gastrodin was quantified in the seven G. elata rhizome/tuber samples, which showed differences in their contents between facility and field samples and between samples collected during different seasons. Parishin E was also found to be present. Combining HPTLC with on-surface (bio)assays, the antioxidant activity and inhibition of acetylcholinesterase as well as the absence of cytotoxicity against human cells were demonstrated and compared between samples.
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Affiliation(s)
- Fernanda L B Mügge
- Department of Food Science, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - Cheul Muu Sim
- Neutron Science Center, Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea
| | - Bernd Honermeier
- Department of Agronomy and Crop Physiology, Justus Liebig University Giessen, 35392 Giessen, Germany
| | - Gertrud E Morlock
- Department of Food Science, Justus Liebig University Giessen, 35392 Giessen, Germany
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Gafner S, Blumenthal M, Foster S, Cardellina JH, Khan IA, Upton R. Botanical Ingredient Forensics: Detection of Attempts to Deceive Commonly Used Analytical Methods for Authenticating Herbal Dietary and Food Ingredients and Supplements. JOURNAL OF NATURAL PRODUCTS 2023; 86:460-472. [PMID: 36716213 PMCID: PMC9972475 DOI: 10.1021/acs.jnatprod.2c00929] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Indexed: 05/30/2023]
Abstract
Botanical ingredients are used widely in phytomedicines, dietary/food supplements, functional foods, and cosmetics. Products containing botanical ingredients are popular among many consumers and, in the case of herbal medicines, health professionals worldwide. Government regulatory agencies have set standards (collectively referred to as current Good Manufacturing Practices, cGMPs) with which suppliers and manufacturers must comply. One of the basic requirements is the need to establish the proper identity of crude botanicals in whole, cut, or powdered form, as well as botanical extracts and essential oils. Despite the legal obligation to ensure their authenticity, published reports show that a portion of these botanical ingredients and products are adulterated. Most often, such adulteration is carried out for financial gain, where ingredients are intentionally substituted, diluted, or "fortified" with undisclosed lower-cost ingredients. While some of the adulteration is easily detected with simple laboratory assays, the adulterators frequently use sophisticated schemes to mimic the visual aspects and chemical composition of the labeled botanical ingredient in order to deceive the analytical methods that are used for authentication. This review surveys the commonly used approaches for botanical ingredient adulteration and discusses appropriate test methods for the detection of fraud based on publications by the ABC-AHP-NCNPR Botanical Adulterants Prevention Program, a large-scale international program to inform various stakeholders about ingredient and product adulteration. Botanical ingredients at risk of adulteration include, but are not limited to, the essential oils of lavender (Lavandula angustifolia, Lamiaceae), rose (Rosa damascena, Rosaceae), sandalwood (Santalum album, Santalaceae), and tea tree (Melaleuca alternifolia, Myrtaceae), plus the extracts of bilberry (Vaccinium myrtillus, Ericaceae) fruit, cranberry (Vaccinium macrocarpon, Ericaceae) fruit, elder (Sambucus nigra, Viburnaceae) berry, eleuthero (Eleutherococcus senticosus, Araliaceae) root, ginkgo (Ginkgo biloba, Ginkgoaceae) leaf, grape (Vitis vinifera, Vitaceae) seed, saw palmetto (Serenoa repens, Arecaceae) fruit, St. John's wort (Hypericum perforatum, Hypericaceae) herb, and turmeric (Curcuma longa, Zingiberaceae) root/rhizome, among numerous others.
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Affiliation(s)
- Stefan Gafner
- American
Botanical Council, Austin, Texas 78714, United States
| | - Mark Blumenthal
- American
Botanical Council, Austin, Texas 78714, United States
| | - Steven Foster
- Steven Foster
Group, Eureka Springs, Arkansas 72632, United States
| | | | - Ikhlas A. Khan
- National
Center for Natural Products Research, University
of Mississippi, University, Mississippi 38677, United States
| | - Roy Upton
- American
Herbal Pharmacopoeia, Scotts
Valley, California 95067, United States
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Le V, Sukhikh A, Larichev T, Ivanova S, Prosekov A, Dmitrieva A. Isolation of the Main Biologically Active Substances and Phytochemical Analysis of Ginkgo biloba Callus Culture Extracts. Molecules 2023; 28:1560. [PMID: 36838548 PMCID: PMC9966355 DOI: 10.3390/molecules28041560] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2022] [Revised: 02/01/2023] [Accepted: 02/03/2023] [Indexed: 02/10/2023] Open
Abstract
The work reveals the results of studying the content of biologically active substances in samples of extracts of Ginkgo biloba callus cultures. Callus cultures grown in vitro on liquid nutrient media were the objects of the study. Considering various factors affecting the yield of the target components during extraction, the volume fraction of the organic modifier in the extracting mixture, the temperature factor, and the exposure time were identified as the main ones. The maximum yield of extractive substances (target biologically active substances with a degree of extraction of at least 50%) from the samples of callus culture extracts was detected at a ratio of extragent of 70% ethanol, a temperature of 50 °C, and exposure time of 6 h. Flavonoids, such as luteolin, quercetin, isoramentin, kaempferol, and amentoflavone, were isolated in the extract samples. As a result of column chromatography, fractions of individual biologically active substances (bilobalide, ginkgolide A, B, and C) were determined. The proposed schemes are focused on preserving the nativity while ensuring maximum purification from associated (ballast) components. Sorbents (Sephadex LH-20, poly-amide, silica gel) were used in successive stages of chromatography with rechromatography. The degree of purity of individually isolated substances was at least 95%.
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Affiliation(s)
- Violeta Le
- Natural Nutraceutical Biotesting Laboratory, Kemerovo State University, Kemerovo 650043, Russia
| | - Andrey Sukhikh
- Laboratory of Physico-Chemical Studies of Pharmacologically Active and Natural Compounds, Kemerovo State University, Kemerovo 650043, Russia
| | - Timothy Larichev
- Department of Fundamental and Applied Chemistry, Kemerovo State University, Kemerovo 650043, Russia
| | - Svetlana Ivanova
- Natural Nutraceutical Biotesting Laboratory, Kemerovo State University, Kemerovo 650043, Russia
- Department of General Mathematics and Informatics, Kemerovo State University, Kemerovo 650043, Russia
| | - Alexander Prosekov
- Laboratory of Biocatalysis, Kemerovo State University, Kemerovo 650043, Russia
| | - Anastasia Dmitrieva
- Natural Nutraceutical Biotesting Laboratory, Kemerovo State University, Kemerovo 650043, Russia
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Frommenwiler DA, Reich E, Sharaf MHM, Cañigueral S, Etheridge CJ. Investigation of market herbal products regulated under different categories: How can HPTLC help to detect quality problems? Front Pharmacol 2022; 13:925298. [PMID: 36003516 PMCID: PMC9393483 DOI: 10.3389/fphar.2022.925298] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Accepted: 07/12/2022] [Indexed: 11/13/2022] Open
Abstract
Background: Herbal products regulated under different categories were found to be of different quality. This has been demonstrated by the increasing number of reports on the quality of herbal products in the scientific literature. Proper identification is an effective way to address this concerning issue early on in a products’ manufacturing process.Objectives: To assess the quality of milk thistle, coneflower and black cohosh herbal drugs, preparations and products commercialized under different regulatory categories, and to illustrate the usefulness of HPTLC as a tool for evaluating quality.Methods: HPTLC methods were adapted from the European Pharmacopeia’s monographs for milk thistle fruits, black cohosh and purple coneflower. Additional detection modes beyond those described in the monographs were employed, and the entire HPTLC fingerprints were used for examination of identity and purity of the investigated samples.Results: All products regulated as Traditional Herbal Medicinal Products were shown to be of high quality: their fingerprints were consistent and without unexpected zones. A significant number of food supplements show quality issues (mainly adulterations): 52.4% of milk thistle, 33.3% of coneflower, and 45.5% of black cohosh products. The same was observed in 66.6% of black cohosh herbal drugs and preparations.
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Affiliation(s)
- Débora A. Frommenwiler
- CAMAG Laboratory, Muttenz, Switzerland
- Unit of Pharmacology, Pharmacognosy and Therapeutics, Faculty of Pharmacy and Food Sciences, Universitat de Barcelona, Barcelona, Spain
| | - Eike Reich
- CAMAG Laboratory, Muttenz, Switzerland
- *Correspondence: Eike Reich,
| | | | - Salvador Cañigueral
- Unit of Pharmacology, Pharmacognosy and Therapeutics, Faculty of Pharmacy and Food Sciences, Universitat de Barcelona, Barcelona, Spain
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Perera WH, Frommenwiler DA, Sharaf MHM, Reich E. An improved high-performance thin-layer chromatographic method to unambiguously assess Ginkgo biloba leaf finished products. JPC-J PLANAR CHROMAT 2022. [DOI: 10.1007/s00764-021-00146-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Bampali E, Germer S, Bauer R, Kulić Ž. HPLC-UV/HRMS methods for the unambiguous detection of adulterations of Ginkgo biloba leaves with Sophora japonica fruits on an extract level. PHARMACEUTICAL BIOLOGY 2021; 59:438-443. [PMID: 33886418 PMCID: PMC8079001 DOI: 10.1080/13880209.2021.1910717] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 02/09/2021] [Accepted: 03/25/2021] [Indexed: 06/12/2023]
Abstract
CONTEXT Ginkgo biloba L. (Ginkgoaceae) leaf extract is one of the most frequently sold herbal extracts. There have been reports on poor quality and adulteration of ginkgo leaf extracts or the powdered plant material with extracts or powder of Styphnolobium japonicum (L.) Schott (Fabaceae) (syn. Sophora japonica L.) fruits, which is rich in flavone glycosides. OBJECTIVE The study investigates whether ginkgo leaves genuinely contain genistein and sophoricoside and whether these two substances could be used as markers to detect adulterations with sophora fruits. MATERIALS AND METHODS A total of 33 samples of dried ginkgo leaves were sourced from controlled plantations in China, the USA, and France. After extraction, the samples were analyzed using two high-performance liquid chromatography (HPLC) coupled with UV/HRMS methods for the detection of genistein and sophoricoside, respectively. Chromatograms were compared to standard reference materials. RESULTS In none of the tested ginkgo samples, neither genistein nor sophoricoside could be detected. The applied method was designed to separate genistein from apigenin. The latter is a genuine compound of ginkgo leaves, and its peak may have been previously misidentified as genistein because of the same molecular mass. The method for the detection of sophoricoside allows identification of the adulteration with sophora fruit without prior hydrolysis. By both HPLC methods, it was possible to detect adulterations of ≥2% sophora fruits in the investigated ginkgo extract. CONCLUSION The methods allow unambiguous detection of adulterations of ginkgo leaves with sophora fruits, using genistein and sophoricoside as marker compounds.
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Affiliation(s)
- Evangelia Bampali
- Institute of Pharmaceutical Sciences, Section of Pharmacognosy, University of Graz, Graz, Austria
- Preclinical Research & Development, Dr. Willmar Schwabe GmbH & Co., Karlsruhe, Germany
| | - Stefan Germer
- Analytical Development, Dr. Willmar Schwabe GmbH & Co., Karlsruhe, Germany
| | - Rudolf Bauer
- Institute of Pharmaceutical Sciences, Section of Pharmacognosy, University of Graz, Graz, Austria
| | - Žarko Kulić
- Preclinical Research & Development, Dr. Willmar Schwabe GmbH & Co., Karlsruhe, Germany
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Response to Letter to the Editor regarding "Comparison of phytochemical composition of Ginkgo biloba extracts using a combination of non-targeted and targeted analytical approaches". Anal Bioanal Chem 2021; 413:7627-7629. [PMID: 34689227 DOI: 10.1007/s00216-021-03698-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2021] [Accepted: 09/24/2021] [Indexed: 10/20/2022]
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Woodley SB, Mould RR, Sahuri-Arisoylu M, Kalampouka I, Booker A, Bell JD. Mitochondrial Function as a Potential Tool for Assessing Function, Quality and Adulteration in Medicinal Herbal Teas. Front Pharmacol 2021; 12:660938. [PMID: 33981240 PMCID: PMC8107435 DOI: 10.3389/fphar.2021.660938] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Accepted: 03/29/2021] [Indexed: 11/13/2022] Open
Abstract
Quality control has been a significant issue in herbal medicine since herbs became widely used to heal. Modern technologies have improved the methods of evaluating the quality of medicinal herbs but the methods of adulterating them have also grown in sophistication. In this paper we undertook a comprehensive literature search to identify the key analytical techniques used in the quality control of herbal medicine, reviewing their uses and limitations. We also present a new tool, based on mitochondrial profiling, that can be used to measure medicinal herbal quality. Besides being fundamental to the energy metabolism required for most cellular activities, mitochondria play a direct role in cellular signalling, apoptosis, stress responses, inflammation, cancer, ageing, and neurological function, mirroring some of the most common reasons people take herbal medicines. A fingerprint of the specific mitochondrial effects of medicinal herbs can be documented in order to assess their potential efficacy, detect adulterations that modulate these effects and determine the relative potency of batches. Furthermore, through this method it will be possible to assess whole herbs or complex formulas thus avoiding the issues inherent in identifying active ingredients which may be complex or unknown. Thus, while current analytical methods focus on determining the chemical quality of herbal medicines, including adulteration and contamination, mitochondrial functional analysis offers a new way of determining the quality of plant derived products that is more closely linked to the biological activity of a product and its potential clinical effectiveness.
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Affiliation(s)
- Steven B Woodley
- Research Centre for Optimal Health, School of Life Sciences, College of Liberal Arts and Sciences, University of Westminster, London, United Kingdom
| | - Rhys R Mould
- Research Centre for Optimal Health, School of Life Sciences, College of Liberal Arts and Sciences, University of Westminster, London, United Kingdom
| | - Meliz Sahuri-Arisoylu
- Research Centre for Optimal Health, School of Life Sciences, College of Liberal Arts and Sciences, University of Westminster, London, United Kingdom.,Health Innovation Ecosystem, University of Westminster, London, United Kingdom
| | - Ifigeneia Kalampouka
- Research Centre for Optimal Health, School of Life Sciences, College of Liberal Arts and Sciences, University of Westminster, London, United Kingdom
| | - Anthony Booker
- Research Centre for Optimal Health, School of Life Sciences, College of Liberal Arts and Sciences, University of Westminster, London, United Kingdom.,Research Group 'Pharmacognosy and Phytotherapy', UCL School of Pharmacy, London, United Kingdom
| | - Jimmy D Bell
- Research Centre for Optimal Health, School of Life Sciences, College of Liberal Arts and Sciences, University of Westminster, London, United Kingdom
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Tantray YR, Wani MS, Pradhan SK, Hamid M, Jan I, Singhal VK, Gupta RC, Habeeb TH. Morphological, cytological and phytochemical studies in naturally occurring diploid and tetraploid populations of Physochlaina praealta from high altitudes of Trans-Himalaya. JPC-J PLANAR CHROMAT 2021. [DOI: 10.1007/s00764-020-00075-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Quality assessment of Sclerocarya birrea leaves and leaves products from Burkina Faso based on fingerprinting using HPTLC. JPC-J PLANAR CHROMAT 2020. [DOI: 10.1007/s00764-020-00058-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Grazina L, Amaral JS, Costa J, Mafra I. Authentication of Ginkgo biloba Herbal Products by a Novel Quantitative Real-Time PCR Approach. Foods 2020; 9:E1233. [PMID: 32899672 PMCID: PMC7555165 DOI: 10.3390/foods9091233] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 08/29/2020] [Accepted: 08/29/2020] [Indexed: 01/16/2023] Open
Abstract
Ginkgo biloba is a widely used medicinal plant. Due to its potential therapeutic effects, it is an ingredient in several herbal products, such as plant infusions and plant food supplements (PFS). Currently, ginkgo is one of the most popular botanicals used in PFS. Due to their popularity and high cost, ginkgo-containing products are prone to be fraudulently substituted by other plant species. Therefore, this work aimed at developing a method for G. biloba detection and quantification. A new internal transcribe spacer (ITS) marker was identified, allowing the development of a ginkgo-specific real-time polymerase chain reaction (PCR) assay targeting the ITS region, with high specificity and sensitivity, down to 0.02 pg of DNA. Additionally, a normalized real-time PCR approach using the delta cycle quantification (ΔCq) method was proposed for the effective quantification of ginkgo in plant mixtures. The method exhibited high performance parameters, namely PCR efficiency, coefficient of correlation and covered dynamic range (50-0.01%), achieving limits of detection and quantification of 0.01% (w/w) of ginkgo in tea plant (Camellia sinensis). The quantitative approach was successfully validated with blind mixtures and further applied to commercial ginkgo-containing herbal infusions. The estimated ginkgo contents of plant mixture samples suggest adulterations due to reduction or almost elimination of ginkgo. In this work, useful and robust tools were proposed to detect/quantify ginkgo in herbal products, which suggests the need for a more effective and stricter control of such products.
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Affiliation(s)
- Liliana Grazina
- REQUIMTE-LAQV, Faculdade de Farmácia, Universidade do Porto, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal; (L.G.); (J.C.)
| | - Joana S. Amaral
- Centro de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Campus de Sta. Apolónia, 5301-857 Bragança, Portugal;
| | - Joana Costa
- REQUIMTE-LAQV, Faculdade de Farmácia, Universidade do Porto, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal; (L.G.); (J.C.)
| | - Isabel Mafra
- REQUIMTE-LAQV, Faculdade de Farmácia, Universidade do Porto, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto, Portugal; (L.G.); (J.C.)
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Shakya A, Chaudhary SK, Bhat HR, Gogoi N, Ghosh SK. A Rapid High-Performance Thin-Layer Chromatographic Method to Estimate Quercetin inBenincasa hispida(Thunb.) Cogn. Fruit Pulp. JPC-J PLANAR CHROMAT 2019. [DOI: 10.1556/1006.2019.32.6.4] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Anshul Shakya
- Department of Pharmaceutical Sciences, Faculty of Science and Engineering, Dibrugarh University, Dibrugarh 786 004, Assam, India
| | - Sushil Kumar Chaudhary
- Faculty of Pharmacy, DIT University, Mussoorie-Diversion Road, Makkawala, Dehradun 248 009, Uttarakhand, India
| | - Hans Raj Bhat
- Department of Pharmaceutical Sciences, Faculty of Science and Engineering, Dibrugarh University, Dibrugarh 786 004, Assam, India
| | - Neelutpal Gogoi
- Department of Pharmaceutical Sciences, Faculty of Science and Engineering, Dibrugarh University, Dibrugarh 786 004, Assam, India
| | - Surajit Kumar Ghosh
- Department of Pharmaceutical Sciences, Faculty of Science and Engineering, Dibrugarh University, Dibrugarh 786 004, Assam, India
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