Comparison of glycyrrhizin content in 25 major kinds of Kampo extracts containing Glycyrrhizae Radix used clinically in Japan
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Abstract
Glycyrrhizae Radix is the most frequently used crude drug in Japan and is prescribed in Kampo medicine for the treatment of a wide range of diseases. The major active ingredient of Glycyrrhizae Radix, glycyrrhizin (GL), has been shown to possess various pharmacological actions, but is also known to cause adverse effects such as pseudoaldosteronism. To avoid the adverse effects of GL, precautions have been indicated on the package inserts of Glycyrrhizae Radix-containing formulas depending on the amount of Glycyrrhizae Radix they contain. However, it remains unknown whether the extraction efficiency of GL from Glycyrrhizae Radix is constant throughout the different combinations of crude drugs in Glycyrrhizae Radix-containing formulas. To confirm the basis of the safety regulation, in this study we comprehensively determined the GL content of 25 major kinds of Kampo extracts compounding Glycyrrhizae Radix. We found that the GL content per daily dosage in all Kampo extracts are generally proportional to the compounding amount of Glycyrrhizae Radix, except in the case of shoseiryuto (Sho-seiryu-To). We also found that Schisandrae Fructus in Sho-seiryu-To decoction caused a lowered pH condition and drastically decreased the extraction efficacy of GL from Glycyrrhizae Radix. Moreover, we were able to confirm that the extraction efficiency of GL from Glycyrrhizae Radix is dependent on the pH value of the extraction solvent. The extraction efficiency of GL in the 25 kinds of Kampo extracts was not constant but it correlates significantly with the pH value of the decoction. Furthermore, the GL contents are well correlated with pseudoaldosteronism incidence data obtained from the Japanese Adverse Drug Event Report (JADER) database on the 25 kinds of Kampo extracts. This suggests that the GL content is a better index to consider to avoid the adverse effects of Glycyrrhizae Radix-containing Kampo formulas.
Keywords
Glycyrrhizae Radix Glycyrrhizin (GL) Kampo extracts HPLC pH PseudoaldosteronismIntroduction
Glycyrrhizae Radix is the most frequently used crude drug in Japan and is defined in the Japanese Pharmacopoeia as the root and stolon of Glycyrrhiza uralensis Fischer or Glycyrrhiza glabra Linne. The root of Glycyrrhiza plants has also been used as natural food additives for a long time [1]. Glycyrrhizae Radix is prescribed as an active component in multi-drug formulations of Kampo medicine to treat a variety of diseases.
Glycyrrhizin (GL), a major ingredient of Glycyrrhizae Radix, is a triterpenoid saponin [2] and shows various pharmacological actions such as anti-inflammatory [3, 4, 5] and anti-allergy effects [6, 7, 8]. Purified GL is also used as a medicine for the treatment of chronic hepatitis in Japan [9, 10, 11], as well as being used as a sweetener of natural origin [12].
Several investigators have reported that excessive and/or long-term administration of Glycyrrhizae Radix-containing Kampo medicines and crude drug products or GL alone frequently leads to pseudoaldosteronism [13, 14, 15], such as peripheral edema [16, 17, 18], hypokalemia [19, 20] and hypertension [21, 22]. These adverse effects are thought to result from glycyrrhetinic acid (GA), a major metabolite of GL that inhibits type 2 11β-hydroxysteroid dehydrogenase, leading to an increase in cortisol level instead of cortisone in the kidney. The elevated cortisol stimulates the mineralocorticoid receptor resulting in increased sodium retention and potassium excretion [23, 24]. In order to avoid these adverse effects, the amount of Glycyrrhizae Radix in Kampo prescriptions is seen as an important factor. Different precautions are described on ethical and OTC drug package inserts depending on the amount of Glycyrrhizae Radix they contain, e.g., more than or less than 2.5 g of Glycyrrhizae Radix in compounding Kampo extract formulation. However, it is still unstated whether the same amount of GL in each Kampo prescription is based on the amount of Glycyrrhizae Radix or not.
Therefore, this study aims to determine how the GL content varies in major Kampo prescriptions, and if the extraction efficiency of GL is affected by other constituents and/or crude drugs in compounding Kampo prescriptions.
In the present study, we chose 25 kinds of Kampo formulas containing Glycyrrhizae Radix from the top 20 list of ethical Kampo formulations and the top 30 list of OTC Kampo formulations in Japan (2011). The Kampo extracts were then prepared and their GL contents were determined by high-performance liquid chromatography (HPLC). Moreover, we calculated and compared the extraction efficacy of each Kampo extract. We also evaluated the relationship between the compounding amounts of Glycyrrhizae Radix or the GL content of the 25 kinds of Kampo extracts and the number of reported cases obtained from the Japanese Adverse Drug Event Report (JADER) database to provide recommendations on how to avoid the adverse effects such as pseudoaldosteronism in Kampo formulas compounding Glycyrrhizae Radix.
Materials and methods
Materials
List of crude drugs used in the study
| Name of the crude drug | Lot no. | Manufacturers |
|---|---|---|
| Glycyrrhizae Radix | C10891 | Tsumura & Co. |
| Angelicae Radix | F26171 | Tsumura & Co. |
| Asiasari Radix | 25039481 | Tsumura & Co. |
| Astragali Radix | 24008061 | Tsumura & Co. |
| Bupleuri Radix | F18911 | Tsumura & Co. |
| Ginseng Radix | F3297 | Tsumura & Co. |
| Paeoniae Radix | D49651 | Tsumura & Co. |
| Platycodi Radix | AD2681 | Tsumura & Co. |
| Polygalae Radix | AE4891 | Tsumura & Co. |
| Puerariae Radix | H42281 | Tsumura & Co. |
| Rehmanniae Radix | F00661 | Tsumura & Co. |
| Saposhnikoviae Radix | AE2041 | Tsumura & Co. |
| Saussreae Raidx | 3F10M | Daiko Shoyaku Ltd. |
| Scutellariae Radix | AJ3161 | Tsumura & Co. |
| Alismatis Tuber | AA8921 | Tsumura & Co. |
| Ophiopogonis Tuber | F33241 | Tsumura & Co. |
| Pinelliae Tuber | DO8801 | Tsumura & Co. |
| Atractylodis Rhizoma | F29971 | Tsumura & Co. |
| Cimicifugae Rhizoma | AA9131 | Tsumura & Co. |
| Cnidii Rhizoma | 23038151 | Tsumura & Co. |
| Copitidis Rhizoma | AD1381 | Tsumura & Co. |
| Rhei Rhizoma | AJ1911 | Tsumura & Co. |
| Sinomeni Caulis et Rhizoma | F47171 | Tsumura & Co. |
| Zingiberis Processum Rhizoma | AD9651 | Tsumura & Co. |
| Zingiberis Rhizoma | AE5571 | Tsumura & Co. |
| Cinnamomi Cortex | D43061 | Tsumura & Co. |
| Lycii Cortex | 022012003 | Tochimoto Tenkaido Co. Ltd. |
| Magnoliae Cortex | AD3571 | Tsumura & Co. |
| Moutan Cortex | AJ9201 | Tsumura & Co. |
| Uncariae Uncis cum Ramulus | AE4331 | Tsumura & Co. |
| Citri Unshu Pericarpium | AE2911 | Tsumura & Co. |
| Euodiae Fructus | 25036841 | Tsumura & Co. |
| Forsythiae Fructus | AD2891 | Tsumura & Co. |
| Gardeniae Fructus | AJ8671 | Tsumura & Co. |
| Oryzae Fructus | 039007005 | Tochimoto Tenkaido Co. Ltd. |
| Schisandrae Fructus | AJ2741 | Tsumura & Co. |
| Zizyphi Fructus | D35531 | Tsumura & Co. |
| Armeniacae Semen | AA8781 | Tsumura & Co. |
| Longan Arillus | 022813003 | Tochimoto Tenkaido Co. Ltd. |
| Nelumbis Semen | F24001 | Tsumura & Co. |
| Plantaginis Semen | 1I05M | Daiko Shoyaku Ltd. |
| Zizyphi Semen | AE0271 | Tsumura & Co. |
| Ephedra Herba | F17391 | Tsumura & Co. |
| Menthae Herba | AA890 | Tsumura & Co. |
| Perillae Herba | AJ0511 | Tsumura & Co. |
| Chrysanthemi Flos | 0L13 | Daiko Shoyaku Ltd. |
| Schizonepetae Spica | AD6531 | Tsumura & Co. |
| Polyporus | AD0201 | Tsumura & Co. |
| Poria | F19561 | Tsumura & Co. |
| Asini Corii Collas | 3F03M | Daiko Shoyaku Ltd. |
| Ostreae Testa | AE2701 | Tsumura & Co. |
| Fossilia Ossis Mastodi | AJ7681 | Tsumura & Co. |
| Gypsum Fibrosum | C52151 | Tsumura & Co. |
| Kasseki | OK02 | Daiko Shoyaku Ltd. |
| Natrium Sulfuricum | F00615 | Tomita Pharmaceutical Co. Ltd. |
Preparation of Kampo extracts compounding Glycyrrhizae Radix and measurement of the pH values of the decoctions
A daily dosage of crude drugs compounded according to each Kampo formulas was decocted with 600 ml ion-exchanged and distilled water using an electric heater (HMJ-1000N; HARIO Co., Ltd., Tokyo, Japan) for 60 min. The decoction was filtered then cooled down to room temperature. The pH value was measured by a pH meter (SevenEasy pH; Mettler Toledo, Switzerland) using electrodes (InLab Expert Pro). Finally, the filtrate was lyophilized to powder. The extract was stored at −20 °C before use. In the case of Shoseiryuto (Sho-seiryu-To), the extracts of crude drugs and Kampo formulas without one crude drug were prepared in the same manner.
HPLC analysis of GL content in 25 kinds of Kampo extracts and crude drugs
All procedures were based on JPX VI. Briefly, 50 mg of each powdered Kampo extract was accurately weighed and dissolved with water up to a volume of 50 ml. The mixture was filtered with Millex-HP and then subjected to HPLC analysis. The Shimadzu LC-10Avp HPLC series with UV–VIS detector and C-R8A (Kyoto, Japan) were used for data acquisition and integration. Separations were carried out in an Inertsil-ODS3 (5 μm, 4.6 mm I.D. × 150 mm, GL Science, Tokyo) with 2% acetic acid-acetonitrile (60:40) as eluent. The detection wavelength was 254 nm, the flow rate was 1.0 ml/min, and column temperature was 40 °C. The determination of GL content was carried out by absolute calibration curve method.
Effect of pH on the extraction efficiency of GL from Glycyrrhizae Radix
With reference to JP XVI, powdered crude drugs were accurately weighed and extracted with 100 mM citric buffer (pH 3.5, 4.0), 100 mM acetate buffer (pH 4.5) or 100 mM phosphate buffer (pH 2.1, 3.0, 5.0, 6.0, 6.8, 8.0) instead of diluted ethanol. Then, the GL content was determined by HPLC.
Statistical analysis
The correlation analyses (i) between the extraction efficiency and the pH value of the decoction, and (ii) the compounding amounts of Glycyrrhizae Radix or the GL contents and the number of reported cases concerning pseudoaldosteronism, were performed using Pearson’s correlation.
Results and discussion
GL content in crude drugs and Glycyrrhizae Radix as a material
First, the GL content in Glycyrrhizae Radix used in this study was determined by HPLC, based on the quantitative method described in JP XVI. It was found that the lot used in this study contained 54.5 ± 2.5 mg of GL per 1 g of dried Glycyrrhizae Radix.
Determination of glycyrrhizin (GL) content in Glycyrrhizae Radix used in this study. The crude drug (Lot No. C10891, Tsumura & Co.) was extracted with 50% ethanol solution as described in JPX VI and the GL content was determined by high-performance liquid chromatography. Decoction 1 was prepared with cut crude drug and decoction 2 was prepared with powdered crude drug. Each column represents the mean ± SEM of three samples
GL content in 25 kinds of Kampo extracts compounding Glycyrrhizae Radix
List of Kampo prescriptions used in the study
| shakuyakukanzoto (Shakuyaku-kanzo-To) | |
| Paeoniae Radix | 4.0 |
| Glycyrrhizae Radix | 4.0 |
| shoseiryuto (Sho-seiryu-To) | |
| Ephedra Herba | 3.0 |
| Paeoniae Radix | 3.0 |
| Zingiberis Processum Rhizoma | 3.0 |
| Glycyrrhizae Radix | 3.0 |
| Cinnamomi Cortex | 3.0 |
| Asiasari Radix | 3.0 |
| Schisandrae Fructus | 3.0 |
| Pinelliae Tuber | 6.0 |
| hangeshashinto (Hange-shashin-To) | |
| Pinelliae Tuber | 5.0 |
| Scutellariae Radix | 2.5 |
| Zingiberis Processum Rhizoma | 2.5 |
| Ginseng Radix | 2.5 |
| Glycyrrhizae Radix | 2.5 |
| Zizyphi Fructus | 2.5 |
| Copitidis Rhizoma | 1.0 |
| gorinsan (Gorin-San) | |
| Poria | 5.0 |
| Angelicae Radix | 3.0 |
| Scutellariae Radix | 3.0 |
| Glycyrrhizae Radix | 2.0 |
| Paeoniae Radix | 2.0 |
| Gardeniae Fructus | 2.0 |
| unkeito (Unkei-To) | |
| Pinelliae Tuber | 5.0 |
| Ophiopogonis Tuber | 10.0 |
| Angelicae Radix | 2.0 |
| Cnidii Rhizoma | 2.0 |
| Paeoniae Radix | 2.0 |
| Ginseng Radix | 2.0 |
| Cinnamomi Cortex | 2.0 |
| Moutan Cortex | 2.0 |
| Glycyrrhizae Radix | 2.0 |
| Zingiberis Rhizoma | 0.3 |
| Euodiae Fructus | 3.0 |
| Asini Corii Collas | 2.0 |
| bakumondoto (Bakumondo-To) | |
| Ophiopogonis Tuber | 10.0 |
| Pinelliae Tuber | 5.0 |
| Zizyphi Fructus | 3.0 |
| Ginseng Radix | 2.0 |
| Glycyrrhizae Radix | 2.0 |
| Oryzae Fructus | 5.0 |
| boiogito (Boi-ogi-To) | |
| Sinomeni Caulis et Rhizoma | 4.0 |
| Astragali Radix | 5.0 |
| Atractylodis Rhizoma | 3.0 |
| Zingiberis Rhizoma | 1.0 |
| Zizyphi Fructus | 4.0 |
| Glycyrrhizae Radix | 2.0 |
| bofutsushosan (Bofu-tsusho-San) | |
| Angelicae Radix | 1.2 |
| Paeoniae Radix | 1.2 |
| Cnidii Rhizoma | 1.2 |
| Gardeniae Fructus | 1.2 |
| Forsythiae Fructus | 1.2 |
| Menthae Herba | 1.2 |
| Zingiberis Rhizoma | 0.4 |
| Schizonepetae Spica | 1.2 |
| Saposhnikoviae Radix | 1.2 |
| Ephedra Herba | 1.2 |
| Natrium Sulfuricum | 0.6 |
| Atractylodis Rhizoma | 2.0 |
| Platycodi Radix | 2.0 |
| Scutellariae Radix | 2.0 |
| Glycyrrhizae Radix | 2.0 |
| Gypsum Fibrosum | 2.0 |
| Kasseki | 3.0 |
| saireito (Sai-rei-To) | |
| Bupleuri Radix | 5.0 |
| Pinelliae Tuber | 4.0 |
| Zingiberis Rhizoma | 1.0 |
| Scutellariae Radix | 3.0 |
| Zizyphi Fructus | 2.5 |
| Ginseng Radix | 2.5 |
| Glycyrrhizae Radix | 2.0 |
| Alismatis Tuber | 5.0 |
| Polyporus | 3.0 |
| Poria | 3.0 |
| Atractylodis Rhizoma | 3.0 |
| Cinnamomi Cortex | 2.5 |
| shosaikoto (Sho-saiko-To) | |
| Bupleuri Radix | 6.0 |
| Pinelliae Tuber | 5.0 |
| Scutellariae Radix | 3.0 |
| Ginseng Radix | 3.0 |
| Zizyphi Fructus | 3.0 |
| Zingiberis Rhizoma | 1.0 |
| Glycyrhizae Radix | 2.0 |
| saibokuto (Sai-boku-To) | |
| Bupleuri Radix | 7.0 |
| Pinelliae Tuber | 5.0 |
| Zingiberis Rhizoma | 1.0 |
| Scutellariae Radix | 3.0 |
| Zizyphi Fructus | 3.0 |
| Ginseng Radix | 3.0 |
| Glycyrrhizae Radix | 2.0 |
| Poria | 5.0 |
| Magnoliae Cortex | 3.0 |
| Perillae Herba | 2.0 |
| kakkonto (Kakkon-To) | |
| Puerariae Radix | 8.0 |
| Ephedra Herba | 4.0 |
| Zingiberis Rhizoma | 1.0 |
| Zizyphi Fructus | 4.0 |
| Cinnamomi Cortex | 3.0 |
| Paeoniae Radix | 3.0 |
| Glycyrrhizae Radix | 2.0 |
| keishikaryukotsuboreito (Keishi-ka-ryukotsu-borei-To) | |
| Cinnamomi Cortex | 3.0 |
| Paeoniae Radix | 3.0 |
| Zizyphi Fructus | 3.0 |
| Zingiberis Rhizoma | 3.0 |
| Glycyrrhizae Radix | 2.0 |
| Fossilia Ossis Mastodi | 2.0 |
| Ostreae Testa | 3.0 |
| maoto (Mao-To) | |
| Ephedra Herba | 4.0 |
| Armeniacae Semen | 4.0 |
| Cinnamomi Cortex | 3.0 |
| Glycyrrhizae Radix | 1.5 |
| saikokeishito (Saiko-keishi-To) | |
| Bupleuri Radix | 5.0 |
| Pinelliae Tuber | 4.0 |
| Cinnamomi Cortex | 2.0 |
| Paeoniae Radix | 2.0 |
| Scutellariae Radix | 2.0 |
| Ginseng Radix | 2.0 |
| Zizyphi Fructus | 2.0 |
| Glycyrhizae Radix | 1.5 |
| Zingiberis Rhizoma | 1.0 |
| seishinrenshiin (Seishin-renshi-In) | |
| Ophiopogonis Tuber | 4.0 |
| Poria | 4.0 |
| Ginseng Radix | 3.0 |
| Plantaginis Semen | 3.0 |
| Scutellariae Radix | 3.0 |
| Astragali Radix | 2.0 |
| Glycyrhizae Radix | 1.5 |
| Nelumbis Semen | 4.0 |
| Lycii Cortex | 2.0 |
| yokukansankachinpihange (Yokukan-San-ka-chinpi-hange) | |
| Angelicae Radix | 3.0 |
| Cnidii Rhizoma | 3.0 |
| Poria | 4.0 |
| Atractylodis Rhizoma | 4.0 |
| Bupleuri Radix | 2.0 |
| Pinelliae Tuber | 5.0 |
| Glycyrhizae Radix | 1.5 |
| Citri Unshu Pericarpium | 3.0 |
| Uncariae Uncis cum Ramulus | 3.0 |
| hochuekkito (Hochu-ekki-To) | |
| Ginseng Radix | 4.0 |
| Atractylodis Rhizoma | 4.0 |
| Astragali Radix | 4.0 |
| Angelicae Radix | 3.0 |
| Citri Unshu Pericarpium | 2.0 |
| Zizyphi Fructus | 2.0 |
| Bupleuri Radix | 1.0 |
| Glycyrhizae Radix | 1.5 |
| Zingiberis Rhizoma | 0.5 |
| Cimicifugae Rhizoma | 0.5 |
| kamishoyosan (Kami-shoyo-San) | |
| Angelicae Radix | 3.0 |
| Atractylodis Rhizoma | 3.0 |
| Bupleuri Radix | 3.0 |
| Gardeniae Fructus | 2.0 |
| Zingiberis Rhizoma | 1.0 |
| Paeoniae Radix | 3.0 |
| Poria | 3.0 |
| Moutan Cortex | 2.0 |
| Glycyrhizae Radix | 1.5 |
| Menthae Herba | 1.0 |
| juzentaihoto (Juzen-taiho-To) | |
| Ginseng Radix | 3.0 |
| Astragali Radix | 3.0 |
| Atractylodis Rhizoma | 3.0 |
| Poria | 3.0 |
| Angelicae Radix | 3.0 |
| Paeoniae Radix | 3.0 |
| Rehmanniae Radix | 3.0 |
| Cinnamomi Cortex | 3.0 |
| Glycyrhizae Radix | 1.5 |
| yokukansan (Yokukan-San) | |
| Angelicae Radix | 3.0 |
| Cnidii Rhizoma | 3.0 |
| Poria | 4.0 |
| Atractylodis Rhizoma | 4.0 |
| Bupleuri Radix | 2.0 |
| Glycyrhizae Radix | 1.5 |
| Uncariae Uncis cum Ramulus | 3.0 |
| chotosan (Choto-San) | |
| Uncariae Uncis cum Ramulus | 3.0 |
| Citri Unshu Pericarpium | 3.0 |
| Chrysanthemi Flos | 2.0 |
| Saposhnikoviae Radix | 2.0 |
| Pinelliae Tuber | 3.0 |
| Ophiopogonis Tuber | 3.0 |
| Poria | 3.0 |
| Ginseng Radix | 2.0 |
| Zingiberis Rhizoma | 1.0 |
| Glycyrhizae Radix | 1.0 |
| Gypsum Fibrosum | 5.0 |
| kamikihito (Kami-kihi-To) | |
| Ginseng Radix | 3.0 |
| Poria | 3.0 |
| Longan Arillus | 3.0 |
| Angelicae Radix | 2.0 |
| Bupleuri Radix | 3.0 |
| Glycyrhizae Radix | 1.0 |
| Zizyphi Fructus | 2.0 |
| Zingiberis Rhizoma | 0.5 |
| Atractylodis Rhizoma | 3.0 |
| Zizyphi Semen | 3.0 |
| Astragali Radix | 3.0 |
| Polygalae Radix | 2.0 |
| Gardeniae Fructus | 2.0 |
| Saussreae Raidx | 1.0 |
| Moutan Cortex | 2.0 |
| ninjinyoeito (Ninjin-yoei-To) | |
| Ginseng Radix | 3.0 |
| Angelicae Radix | 4.0 |
| Paeoniae Radix | 2.0 |
| Rehmanniae Radix | 4.0 |
| Atractylodis Rhizoma | 4.0 |
| Poria | 4.0 |
| Cinnamomi Cortex | 2.5 |
| Astragali Radix | 1.5 |
| Citri Unshu Pericarpium | 2.0 |
| Polygalae Radix | 2.0 |
| Schisandrae Fructus | 1.0 |
| Glycyrhizae Radix | 1.0 |
| rikkunshito (Rikkunshi-To) | |
| Ginseng Radix | 4.0 |
| Atractylodis Rhizoma | 4.0 |
| Poria | 4.0 |
| Pinelliae Tuber | 4.0 |
| Citri Unshu Pericarpium | 2.0 |
| Zizyphi Fructus | 2.0 |
| Glycyrhizae Radix | 1.0 |
| Zingiberis Rhizoma | 0.5 |
Determination of glycyrrhizin (GL) content in 25 kinds of Kampo extracts. Each column represents the mean ± SEM of three samples
The relationship between glycyrrhizin (GL) content and amount of Glycyrrhizae Radix compounding 25 kinds of Kampo extracts. a 25 kinds of Kampo extracts, b 23 kinds of Kampo extracts excluding Sho-seiryu-To and Shakuyaku-kanzo-To, c 24 kinds of Kampo extracts excluding Sho-seiryu-To, d 24 kinds of Kampo extracts excluding Shakuyaku-kanzo-To. Each point represents the mean of three samples. Filled circle 23 kinds of Kampo extracts, open triangle Sho-seiryu-To, filled triangle Shakuyaku-kanzo-To
Effects of other crude drugs on GL content in Sho-seiryu-To
In our preliminary experiments, we prepared extracts by combining Glycyrrhizae Radix with other components compounding Sho-seiryu-To such as Pinelliae Tuber, Ephedra Herba, Cinnamomi Cortex, Schisandrae Fructus, Paeoniae Radix, Asiasari Radix, and Zingiberis Processum Rhizoma. Then, the GL content of every combination was determined by HPLC. We observed a significant decrease of GL content when Glycyrrhizae Radix was combined with Schisandrae Fructus containing Sho-seiryu-To (data not shown).
Effect of Schisandrae Fructus on the extraction efficiency of glycyrrhizin (GL) in Sho-seiryu-To. Each column represents the mean ± SEM of three samples
Effect of Schisandrae Fructus on the pH value of the decoction in Sho-seiryu-To. Each column represents the mean ± SEM of three samples
Effect of pH on the extraction efficiency of GL from Glycyrrhizae Radix
We clarified the effect of pH on the extraction efficiency of GL from Glycyrrhizae Radix using powdered crude drug and various buffers.
The relationship between the extraction efficiency of glycyrrhizin (GL) and the pH value of buffer. Each point represents the mean of three samples
Effect of pH on the extraction efficiency of glycyrrhizin (GL) from Glycyrrhizae Radix: recovery of the extraction efficiency of GL extracted with 100 mM phosphate buffer (pH = 6.8) from the residue pre-extracted with 100 mM phosphate buffer (pH = 2.1). Each column represents the mean of three samples
The relationship between the extraction efficiency of glycyrrhizin (GL) and the pH values of 25 kinds of Kampo extracts. Each point represents the mean of three samples. Open circle buffer, filled circle 22 kinds of Kampo extracts, open triangle Sho-seiryu-To, filled traingle Shakuyaku-kanzo-To, open square Keishi-ka-ryukotsu-borei-To
The relationship between the GL content and the incidence of adverse effects of Kampo medicine containing Glycyrrhizae Radix
The incidence of adverse effects of Kampo formulas containing Glycyrrhizae Radix. Closed column represents the incidence from using ethical Kampo extract formulations and opened column represents the incidence from using OTC Kampo extract formulations, respectively
Conclusion
In this study, we determined the GL content of the 25 major kinds of Kampo extracts compounding Glycyrrhizae Radix in Japan. We found that the GL content per daily dosage in each Kampo medicine is generally proportional to the compounding amount of Glycyrrhizae Radix. We also clarified that the extraction efficiency of GL in the decoction is not constant and is basically dependent on the pH value of the decoction. Moreover, the correlation analysis with Glycyrrhizae Radix-induced adverse events obtained from JADER suggested that the actual GL content is a better index to consider in order to avoid the adverse effects of Glycyrrhizae Radix-containing Kampo formulas.
Notes
Acknowledgement
This study was supported by a Health and Labour Sciences Research Grant for ‘Research on Regulatory Science of Pharmaceuticals and Medical Devices’ from Ministry of Health, Labour and Welfare.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
Supplementary material
References
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