Protopseudohypericin
Reference standards.
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Providing storage is as stated on the product vial and the vial is kept tightly sealed, the product can be stored for up to
24 months(2-8C).
Wherever possible, you should prepare and use solutions on the same day. However, if you need to make up stock solutions in advance, we recommend that you store the solution as aliquots in tightly sealed vials at -20C. Generally, these will be useable for up to two weeks. Before use, and prior to opening the vial we recommend that you allow your product to equilibrate to room temperature for at least 1 hour.
Need more advice on solubility, usage and handling? Please email to: service@chemfaces.com
The packaging of the product may have turned upside down during transportation, resulting in the natural compounds adhering to the neck or cap of the vial. take the vial out of its packaging and gently shake to let the compounds fall to the bottom of the vial. for liquid products, centrifuge at 200-500 RPM to gather the liquid at the bottom of the vial. try to avoid loss or contamination during handling.
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Phytochemical Analysis,2007,18(3): 204–208.
Simultaneous determination of total hypericin and hyperforin in St. John's wort extracts by HPLC with electrochemical detection[Reference:
WebLink]
METHODS AND RESULTS:
An analytical procedure was developed for the simultaneous determination of total hypericin (Protopseudohypericin, pseudohypericin, protohypericin and hypericin) and hyperforin in Hypericum perforatum (St. John's wort) extracts and its preparations. The determination of total hypericin and hyperforin in one step was achieved by exposing the samples to artificial daylight in amber glass vials.
CONCLUSIONS:
This procedure allows both the photoconversion of the protoforms into the appropriate hypericins and the protection of the photosensitive hyperforin. For quantification, an HPLC method with electrochemical detection was applied. As an example of the application of the principle, two preparations containing St. John's wort were assayed.
Monatshefte für Chemie, 1992,123( 8-9):731-739.
On the nature of “soluble” hypericin inHypericum species[Reference:
WebLink]
METHODS AND RESULTS:
The two red and two violet “soluble” pigments ofHypericum species were isolated by means of extraction, chromatography, and counter-current droplet chromatography. In contrast to authentic hypericin, they are soluble in common organic solvents and even in water.
Using NMR experiments it was deduced that hypericin, pseudohypericin, protohypericin, and Protopseudohypericin are present in the plant as their rapidly interconverting 3- and 4-phenolate ions. From AAS the main counter-ion of these phenolates was derived to be potassium. The potassium and N-ethyl-N,N-diisopropylammonium salts of hypericin were synthesizcd for comparison.
CONCLUSIONS:
A preparative procedure to isolate hypericin and pseudohypericin from plant material was developed.
