This product is the dried above-ground part of the mint plant, Mentha haplocalyx Briq., from the Lamiaceae family. During the summer and autumn, when the stems and leaves are lush or the flowers have bloomed for the third time, they are harvested in batches on sunny days and then dried in the sun or in the shade.
NMM ID | nmm-022w |
Systematic Name | Mentha canadensis Part-aerial |
Systematic Chinese Name | 薄荷地上部（bò hé dì shàng bù） |
Generic Name | Bo-he |
Generic Chinese Name | 薄荷（bò hé） |
NMM Type | plant |
Species Origins | Mentha canadensis | 薄荷 |
Medicinal Parts | part aerial | 地上部 |
Special Descriptions | |
Processing Methods | |
Systematic Name Explanation | This product is the dried above-ground part of the mint plant, Mentha haplocalyx Briq., from the Lamiaceae family. During the summer and autumn, when the stems and leaves are lush or the flowers have bloomed for the third time, they are harvested in batches on sunny days and then dried in the sun or in the shade. |
Generic Name Explanation | NMMGN follows the Chinese name of the relevant Chinese medicinal materials in the Chinese Pharmacopoeia: 2020 edition: Volume I. |
Parent NMM | |
Child NMMs | |
Creators | |
Reviewers |
薄荷
English text reference: Chinese Pharmacopoeia (2020 Edition)
Overview
Field Mint Herb is the dried aerial part of Mentha haplocalyx Briq. (Fam. Labiatae). The drug is collected in summer and autumn when the stems and leaves are luxuriant or when the flowers are in full bloom, dried in the sun or in the shade.
Description
Stems square, with opposite branches, 15-40 cm long, 0.2-0.4 cm in diameter; surface purple-brown or pale green, with pubescence at the angles, internodes 2-5 cm long; texture brittle, fracture white, hollow in the pith. Leaves opposite, with short petioles; leaf blades wrinkled, curled, when whole, broadly lanceolate, long elliptical or ovate, 2-7 cm long, 1-3 cm wide; upper surface dark green, lower surface greyish-green, sparsely pubescent, with glandular scales in pitted depressions. Cymes axillary; calyx campanulate, 5-toothed at the apex; corolla pale purple. Odour, special and cool; taste, pungent and cool.
Identification
(1) Observation of the leaf surface: The head of glandular scales consists of 8 cells, with a diameter of about 90 μm, and the stalk is composed of a single cell; the head and stalk of non-glandular hairs are also single cells. Non-glandular hairs consist of 1-8 cells, often curved, with thick walls and slightly verrucose. Stomata of the lower epidermis are mostly of the paracytic type.
(2) Take a small amount of the powder of the drug, sublime it in a microquantity, add 2 drops of sulfuric acid and a small amount of vanillin crystals, initially showing yellow to orange-yellow, then add 1 drop of water, which turns purple-red.
(3) Take 1 g of the coarse powder of the drug, add 10 ml of anhydrous ethanol, treat with ultrasound for 20 minutes, filter, and take the filtrate as the test solution. Take 1 g of the reference drug of Field Mint Herb, and prepare the reference drug solution in the same way. Take the reference substance of Menthol, add anhydrous ethanol to make a solution containing 2 mg per ml as the reference solution. Carry out the method for thin layer chromatography<0502>, using silica gel G as the coating substance and a mixture of toluene and ethyl acetate (9:1) as the mobile phase. Apply separately to the plate 5-10 μl of each of the above three solutions. After developing and removal of the plate, dry in air. Spray with a 40% solution of p-dimethylaminobenzaldehyde in 10% sulfuric acid in ethanol, heat at 80°C to the spots clear. Examine under ultraviolet light at 365 nm. The fluorescent spots in the chromatograms obtained with the test solution correspond in position and colour to the spots in the chromatograms obtained with the reference drug and the reference solution.
Examination
Leaf
Not less than 30 per cent.
Water
Not more than 15.0 per cent <0832,method 4>.
Total ash
Not more than 11.0 per cent <2302>.
Acid-insoluble ash
Not more than 3.0 per cent <2302>.
Assay
Volatile oil
Take an appropriate amount of this product, about 5mm in length. Add 600ml of water to 100g of the test product, and determine the volatile oil content by the method for determination of volatile oil <2204> under the condition of maintaining a slight boiling for 3 hours.
The content of volatile oil in this product shall not be less than 0.80% (ml/g).
Menthol
Determine by gas chromatography <0521>.
Chromatographic conditions and system suitability test
A capillary column with polyethylene glycol as the stationary phase (column length: 30m, inner diameter: 0.32mm, film thickness: 0.25μm); temperature program: initial temperature 70℃, hold for 4 minutes, then increase at a rate of 1.5℃ per minute to 120℃, then increase at a rate of 3℃ per minute to 200℃, finally increase at a rate of 30℃ per minute to 230℃, hold for 2 minutes; injection port temperature 200℃; detector temperature 300℃; split injection, split ratio 5:1; the theoretical number of plates calculated based on the peak of menthol should not be less than 10000.
Preparation of reference solution
Take an appropriate amount of the reference substance of menthol, accurately weigh, and add anhydrous ethanol to make a solution containing 0.2mg per 1ml.
Preparation of test solution
Take about 2g of the powder of this product (passed through a No. 3 sieve), accurately weigh, place it in a stoppered conical flask, accurately add 50ml of anhydrous ethanol, seal the flask, weigh it, subject it to ultrasonic treatment (power: 250W, frequency: 33kHz) for 30 minutes, let it cool, weigh it again, make up for the weight loss with anhydrous ethanol, shake well, filter, and take the filtrate to obtain the test solution.
Assay
Accurately take 1μl of the reference solution and the test solution, respectively, inject them into the gas chromatograph, determine, and obtain the result.
Calculated on the dried product, the content of menthol (C10H20O) shall not be less than 0.20%.
Prepared slices
Peppermint
Processing
Remove old stems and impurities, lightly spray with water, slightly moisten, cut into short sections, and dry at low temperature in time.
Description
The product is in irregular segments. The stem is square and cylindrical, the surface is purple-brown or light green, with longitudinal ribs, and the corners are velvety. The cut surface is white, hollow. Leaves are much broken, dark green on the upper surface, grey-green on the lower surface, sparsely velutinous. Verticillasters axillary, calyx campanulate, apex 5-toothed, corolla lavender. There is a special cool aroma after rubbing, and the taste is pungent and cool.
Examination
Water
Same as the crude drug.Not more than 13. 0 per cent.
total ash
Same as herbs.
acid-insoluble ash
Same as herbs.
Assay
volatile oil
Same herb, containing not less than 0.40% volatile oil (ml/g).
Menthol
The same herb, calculated according to the dry product, containing menthol (C10H20O) shall not be less than 0.13%.
Identification
Same as herbs.
Property
cool.
Flavor
Pungent.
Meridian tropism
Lung and liver meridians.
Actions
To disperse wind-heat, clear and benefit the head and eyes, promote throat, promote eruption, and regulate liver and qi.
Indications
Used for wind-heat common cold, early stage of wind-heat, headache, red eyes, sore throat, mouth ulcers, wind rash, measles, chest and hypochondriac distention.
Dosage
3～6g.
Administration
Add when the decoction is nearly done.
Storage
Store in a cool and dry place.
薄荷
Text reference: Chinese Pharmacopoeia (2015 Edition)
Overview
Peppermint is the dried aerial part of Mentha haplocalyx Briq. (Fam. Labiatae). The drug is collected in summer and autumn when foliage branch growing luxuriantly or in the third round of flowering, collected in several times on fine days, and dried in the sun or in the shade.
Description
Stems square, with opposite branches, 15-40 cm long, 2-4 mm in diameter； externally purplish-brown or pale green, the angular regions pubescent, internodes 2-5 cm long； texture fragile, fracture white, pith hollowed. Leaves opposite, short petioled, lamina crumpled and rolled, when whole, broadly lanceolate, long-elliptical or ovate, 2-7 cm long, 1-3 cm wide； the upper surface dark green and the lower surface greyish-green, sparsely pubescent, bearing concavely dotted glandular scales. Verticillaster axillary, calyx campanulate, with five terminal teeth, corolla pale purple. Odour, characteristic and aromatic after rubbing； taste, pungent and cool.
Identification
（2）取本品叶的粉末少量，经微量升华得油状物，加硫酸2滴及香草醛结晶少量，初显黄色至橙黄色，再加水1滴，即变紫红色。
Examination
Water
Not more than 15.0 per cent <0832, method 4>.
Total ash
Not more than 11.0 per cent<2302>.
Acid-insoluble ash
Not more than 3.0 per cent<2302>.
Assay
It contains not less than 0.80 per cent (ml/g) of volatile oil.
Prepared slices
Peppermint
Processing
Remove the old stems and foreign matter, spray with a small quantity of water, soften briefly, cut into short sections, and dry at a lower temperature in time.
Property
Pungent and cool.
Flavor
Pungent and cool.
Meridian tropism
Lung and liver meridians.
Actions
To disperse wind-heat, clear and sooth head and eyes, soothe the throat, promote eruption, soothe the liver, and move qi.
Indications
Common cold caused by wind-heat, early onset of wind-warmth disease, headache, red eyes, throat bi disorder, mouth sore, rubella, measles, distention and oppression in the chest, and the hypochondrium.
Dosage
3-6 g.
Administration
Add when the decoction is nearly done.
Storage
Preserve in a cool and dry place.
This product is the dried above-ground part of the mint plant, Mentha haplocalyx Briq., from the Lamiaceae family. During the summer and autumn, when the stems and leaves are lush or the flowers have bloomed for the third time, they are harvested in batches on sunny days and then dried in the sun or in the shade.