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6 rezultatima
[Preparation and stuctural behavior of the inclusion complex of beta-cyclodextrin and coptisine hydrochloride].
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OBJECTIVE
To optimize the preparation of Coptisine hydrochloride/beta-cyclodextrin (beta-CD) inclusion complex and analyze the structure of the inclusion complex.
METHODS
With encapsulation rate as the index of evaluation, different factors influencing the inclusion complex e. g. temperature,
Substituent effect on the dynamics of the inclusion complex formation between protoberberine alkaloids and cucurbit[7]uril.
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The kinetics of entry into and exit from the cavity of cucurbit[7]uril (CB7) was studied by the stopped-flow method in water at various temperatures using pharmaceutically important natural isoquinoline alkaloids as guest compounds. The rate constant of the alkaloid-CB7 complex dissociation was
Determination of amantadine and rimantadine using a sensitive fluorescent probe.
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Amantadine hydrochloride (AMA) and rimantadine hydrochloride (RIM) are non-fluorescent in aqueous solutions. This property makes their determination through direct fluorescent method difficult. The competing reactions and the supramolecular interaction mechanisms between the two drugs and coptisine
A competitive strategy based on cucurbit[7]uril supramolecular interaction for simple and sensitive detection of dibucaine.
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In this work, the competitive interaction between dibucaine and three fluorescent probes (i.e., berberine, palmatine, and coptisine) for occupancy of the cucurbit[7]uril (CB[7]) cavity was studied by fluorescence spectra, UV-visible absorption spectra, (1)H NMR spectra, and theoretical calculations
Development of a Selective Adsorbing Material for Binding of Pyrrolizidine Alkaloids in Herbal Extracts, Based on Molecular Group Imprinting.
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Pyrrolizidine alkaloids are secondary plant constituents that became a subject of public concern because of their hepatotoxic, pneumotoxic, genotoxic, and cytotoxic effects. Due to disregardful harvesting and/or contamination with pyrrolizidine alkaloid-containing plants, there is a high risk of
Binding of alkaloids into the S1 specificity pocket of α-chymotrypsin: evidence from induced circular dichroism spectra.
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Non-covalent binding of planar aromatic molecules into the S1 specificity pocket of the serine protease α-chymotrypsin (αCHT) can be detected by measuring induced circular dichroism (CD) spectroscopic signals. Utilizing this phenomenon, αCHT association of proflavine (PRF), the well known serine
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