Abri Herba
(Jigucao)
Canton Love-pea Vine
Canton Love-pea
Vine is the dried herb of Ahrus cantoniensis Hance (Fam. Leguminosae).
The drug is collected all the year round, removed from soil, and dried.
Description:
Roots mostly
conical, the upper part thick and the lower part thin, branched, varying in
length, 0.5-1.5 cm in diameter. Externally greyish-brown, rough, with fine,
longitudinal striations, rootlets extremely slender, some fallen off or with
remaining texture hard. Stems caespitose, 50-100 cm long, about 0.2 cm in
diameter; greyish-brown to purplish-brown, branchlets slender, sparsely
pubescent. Leaves pinnately compound, alternate, leaflets in 8-11 pairs, mostly
fallen off, oblong, 0.81.2 cm long, apex truncate, mucronulate, the lower
surface with pronated hairs. Odour, slightly aromatic; taste, slightly bitter.
Identification:
(1) Powder:
Greyish-green. Non glandular hairs unicellular> acute or acuminate at the
apex, 60-970 pm long, 12-22 pm in diameter, walls 3-6 pm thick, with distinct
striations and warty prominences. Stomata paracytic. Fibre bundles surrounded
by cells containing prisms of calcium oxalate, forming crystal fibres, walls of
crystal cells irregularly thickened. Stone cells subrounded, subsquare or
oblong, 16-40 pm in diameter, some with slightly thickened walls. Cork cells
yellowish-brown. Prisms of calcium oxalate 5-11 pm in diameter.
(2) To 2 g of the
powder add 50 ml of methanol, ultrasonicate for 1 hour, and filter. Evaporate
the filtrate to dryness, dissolve the residue in 10 ml of n-butanol, extract by
shaking with three 10-ml quantities of 2% solution of hydrochloric acid,
combine the hydrochloric acid extracts, and adjust pH to 7 with 5% solution of
sodium hydroxide Extract by shaking with three 5-ml quantities of n-butanol,
combine the n-butanol extracts, evaporate to dryness, and dissolve the residue
in 1 ml of methanol as the test solution. Dissolve abrine CRS in 80% methanol
to produce a solution containing 0. 1 mg per ml as the reference solution.
Carry out the method for thin layer chromatography (Appendix VI B), using
silica gel G as the coating substance and the upper layer of a mixture of
n-butanol, acetic acid and water (4 : 1 : 5) as the mobile phase. Apply
separately to the plate 5-10 pi of the test solution and 2 pi of the reference
solution. After developing and removal of the plate, dry in air. Spray with ninhydrin
solution TS, heat at 105oC to the spots clear. The spot in the
chromatogram obtained with the test solution corresponds in position and colour
to the spot in the chromatogram obtained with the reference solution.
Water:
Not more than 15.0
per cent (Appendix K H, method 1).
Total ash:
Not more than 7. 5
per cent (Appendix IX K).
Extractives:
Carry out the
method for determination of ethanol-soluble extractives (Appendix X A, the hot
extraction method), using dilute ethanol as the solvent, not less than 6. 0 per
cent
Processing:
Eliminate foreign
matter and legumes, and cut into sections.
Property and Flavor
Cool; sweet and
mild bitter.
Meridian tropism
Liver and stomach
meridians.
Actions:
To drain dampness
to abate jaundice, clear heat and remove toxin, soothe the liver to relieve
paia
Indications:
Dampness-heat
jaundice, discomfort in the rib- sides, distending pain in the stomach duct, acute
mastitis with swelling and pain.
Administration and dosage:
15-30 g.
Storage:
Preserve in a dryplace.
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