Pterocarpus marsupium Heartwood Powder

Pterocarpus marsupium Heartwood Powder

Proposed For Development Version 0.1

Pterocarpus marsupium Heartwood Powder



The article consists of the dried heartwood of Pterocarpus marsupium Roxb. (Family Fabaceae) reduced to powder or very fine powder. It contains NLT 0.5% of pterostilbene, calculated on the dried basis.



None known



Stilbene: Pterostilbene

Flavonoids: Pseudobaptigenin, liquiritigenin, and garbanzol

Chalcone: Isoliquiritigenin and pterosupin

Sesquiterpene alcohols: β-Eudesmol, selin-4(15)-en-1β,11-diol, pterocarpol A, and pterocarpol B



• A. Botanical Characteristics

Macroscopic: Brown to chocolate color powder

Microscopic: Fragments of bordered pitted vessels and tracheids, long thick-walled acicular fibers, often associated with idioblast containing prismatic crystals of calcium oxide, plenty of starch grains and few crystals scattered as such throughout or embedded in the cells of the parenchyma, fragment of tangentially and radially cut medullary rays.

• B. Thin-Layer Chromatography

Standard solution A: 0.5 mg/mL of USP Pterostilbene RS in methanol

Standard solution B: 1.0 mg/mL of USP Pterocarpus marsupium Heartwood Dry Extract RS in methanol. Sonicate for 10 min, centrifuge, and use the supernatant.

Sample solution: Exhaustively extract 50 g of Pterocarpus marsupium Heartwood Powder using hot methanol with reflux. Dry the extract under reduced pressure. Reconstitute 50 mg of dried extract with 10 mL of methanol.

Chromatographic system

(See Chromatography <621>, Thin-Layer Chromatography.)

Adsorbent: Use a suitable chromatographic material with an average particle size of 5 µm (HPTLC plates).

Application volume: 10 µL each of Standard solution AStandard solution B, and Sample solution, as 8-mm bands

Relative humidity: Condition the plate to a relative humidity of about 33% using a suitable device.

Developing solvent system: Chloroform and methanol (9:1)

Developing distance: 10 cm

Derivatization reagent: Use a suitable reagent, if applicable.


Samples: Standard solution A, Standard solution B, and Sample solution

Apply the Samples as bands to a suitable HPTLC plate and dry in air. Develop the chromatograms in a saturated chamber, remove the plate from the chamber, dry, and examine under UV light at 254 and 366 nm.

System suitability: Under UV light at 254 nm, Standard solution B exhibits, in the upper half, an intense dark band corresponding in color and RF to the pterostilbene band in Standard solution A. A pale dark band appears above the pterostilbene band. Under UV light at 366 nm, Standard solution B exhibits three quenching bands with the most itense and lowest RF band corresponding to the pterostilbebene band in Standard solution A

Acceptance criteria: Under UV light at 254 nm, the Sample solution exhibits, in the upper half, an intense dark band corresponding in color and RF to the pterostilbene band in Standard solution A. About three or four dark bands appear in the lower half. Under UV light at 366 nm, the Sample solution exhibits four quenching bands. In the upper half, three quenching bands appear with the lowest RF band corresponding to the pterostilbebene band in Standard solution A. One intense quenching band appears in the middle of the lower half.


Analysis: Proceed as directed in the Assay for Content of Pterostilbene.

Acceptance criteria: The chromatogram of the Sample solution exhibits peaks at the retention times corresponding to the peaks due to pterostilbene in Standard solution B.



• Content of Pterostilbene

Mobile phase: Water and acetonitrile (50:50)

Standard solution A: 0.06 mg/mL of USP Pterostilbene RS in methanol

Standard solution B: Dissolve a weighed amount of USP Pterocarpus marsupium Heartwood Dry Extract RS in methanol to obtain a concentration of 0.06 mg/mL of pterostilbene.

Sample solution: Transfer about 100 g of Pterocarpus marsupium Heartwood Powder, accurately weighed, to a 500-mL round bottom flask and add 300 mL of methanol. Reflux for 45 min. Cool and filter the supernatant. Repeat the step three times using 300 mL of methanol each time. Combine the filtrate and evaporate the solvent under vacuum.

Chromatographic system

(See Chromatography <621>, System Suitability.)

Detector: UV 300 nm

Column: 4.6-mm × 25-cm; 5 μm packing L1

Flow rate: 1.0 mL/min

Injection volume: 20 µL

System suitability

Samples: Standard solution A and Standard solution B

Suitability requirements

Chromatogram similarity: The chromatogram of Standard solution B is similar to the reference chromatogram provided with the lot of USP Pterocarpus marsupium Heartwood Dry Extract RS being used.

Theoretical plates: NLT 5000

Tailing factor: NMT 1.5 for pterostilbene peak, Standard solution A

Relative standard deviation: NMT 2.0% determined from the pterostilbene peak in repeated injection, Standard solution A


Samples: Standard solution A, Standard solution B, and Sample solution

Using the chromatograms of Standard solution A, Standard solution B, and the reference chromatogram provided with the lot of USP Pterocarpus marsupium Heartwood Dry Extract RS being used, identify the retention time of the peaks corresponding to pterostilbene in the Sample solution.

Separately calculate the percentage of pterostilbene in the portion of Pterocarpus marsupium Heartwood Powder taken:


Result = (rU/rS) × CS × (V/W) × 100


rU   = peak area of pterostilbene from the Sample solution

rS   = peak area of pterostilbene from Standard solution A

CS  = concentration of Standard solution A (mg/mL)

V    = volume of the Sample solution (mL)

W   = weight of Pterocarpus marsupium Heartwood Powder taken to prepare the Sample solution (mg)

Acceptance criteria: NLT 0.5% of pterostilbene on the dried basis



• Elemental Impurities—Procedures <233>

Acceptance criteria

Arsenic: NMT 2.0 µg/g

Cadmium: NMT 1.0 µg/g

Lead: NMT 5.0 µg/g

Mercury: NMT 0.2 µg/g

• Articles of Botanical Origin, General Method for Pesticide Residues Analysis <561>: Meets the requirements

• Microbial Enumeration Tests <61>: The total aerobic bacterial count does not exceed 105 cfu/g, the total combined molds and yeasts count does not exceed 103 cfu/g, and the bile-tolerant Gram-negative bacteria does not exceed 103 cfu/g.

• Tests for Specified Microorganisms <62>: Meets the requirements of the tests for the absence of Salmonella species and Escherichia coli

• Articles of Botanical Origin, Aflatoxins <561>: Meets the requirements



• Loss on Drying <731>

Sample: 2 g of Pterocarpus marsupium Heartwood Powder

Analysis: Dry the Sample at 80°.

Acceptance criteria: NMT 10%



• Packaging and Storage: Preserve in well-closed containers, protected from light and moisture, and store at room temperature.

• Labeling: The label states the Latin binomial and the part(s) of the plant contained in the article.

• USP Reference Standards <11>

USP Pterocarpus marsupium Heartwood Dry Extract RS

USP Pterostilbene RS

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