Methyl reserpate
1. Methyl reserpate and reserpinediol, derivatives that incorporate the alkaloid ring system, also competitively inhibit norepinephrine transport into chromaffin vesicles with Ki values of 38 +/- 10 nM and 440 +/- 240 nM, respectively.
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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.
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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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Other References Information
J Neurochem. 1987 Mar;48(3):949-53.
Inhibition of norepinephrine transport and reserpine binding by reserpine derivatives.[Pubmed:
3806108]
Reserpine, a competitive inhibitor of catecholamine transport into adrenal medullary chromaffin vesicles, consists of a trimethoxybenzoyl group esterified to an alkaloid ring system. Reserpine inhibits norepinephrine transport with a Ki of approximately 1 nM and binds to chromaffin-vesicle membranes with a KD of about the same value. Methyl reserpate and reserpinediol, derivatives that incorporate the alkaloid ring system, also competitively inhibit norepinephrine transport into chromaffin vesicles with Ki values of 38 +/- 10 nM and 440 +/- 240 nM, respectively. Similar concentrations inhibit [3H]reserpine binding to chromaffin-vesicle membranes. 3,4,5-Trimethoxybenzyl alcohol and 3,4,5-trimethoxybenzoic acid, derivatives of the other part of the reserpine molecule, do not inhibit either norepinephrine transport or [3H]reserpine binding at concentrations up to 100 microM. Moreover, trimethoxybenzyl alcohol does not potentiate the inhibitory action of Methyl reserpate. Therefore, the amine binding site of the catecholamine transporter appears to bind the alkaloid ring system of reserpine rather than the trimethoxybenzoyl moiety. The more potent inhibitors are more hydrophobic compounds, suggesting that the reserpine binding site is hydrophobic.
