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Results for “Macromolecular Substances”

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At least 19 recordsLinked to original sources
PubMed1981

Urinary macromolecular substances as natural inhibitors of calcium oxalate crystal aggregation.

We studied the inhibitory effect of urinary macromolecular substances (UMM), more than 10,000 mol. wt., on aggregation of calcium oxalate crystals in a crystal-seed system and a non-crystal-seed system. In both assay systems, UMM from non-stone-farmers showed a marked inhibitory activity on crystal aggregation, whereas UMM from recurrent stone-formers showed a weak inhibitory activity. The distinction between the two types of UMM was greater in the non-crystal-seed system. The macromolecular inhibitors seemed to be composed of proteins or protein-complexes inasmuch as approximately 70 to 90 per cent of the macromolecular inhibitory activity was destroyed by protein digestion with pronase. Urinary acid glycosaminoglycans, which have been considered possible inhibitors, played a small role in the inhibition of crystal aggregation.

Adult↗
PubMed2000

[Effect of macromolecular substances on pharmaceutical availability of a potential local anesthetic].

Within the framework of the study of the derivatives of phenylcarbamic acid with a local anaesthetic effect, one of them, a potential medicinal agent with the working name of XX B, chemically N-[2-(3-heptyloxyphenylcarbamoyloxy)-ethyl]-dimethylammoniumchl oride, was investigated. Linking up with the previous studies, the paper investigated the effects of two auxiliary substances--cellulose derivatives (hydroxyethylcellulose, methylcellulose)--and their concentration on the pharmaceutical availability of the potential drug XX B from the dosage form. At the same time the effect of the employed concentration of the macromolecular substances on the viscosity of the dosage form was examined. The study revealed that with the growing concentration of cellulose derivatives the viscosity of the prepared dosage forms was increased, and the release of the active ingredient was decelerated. Both auxiliary substances influenced the pharmaceutical availability of the potential drug XX B in an approximately identical manner, and thus both could be employed for the same purpose.

Anesthetics, Local↗
PubMed1999

Imaging of humic substance macromolecular structures in water and soils

Humic substances (HSs) are the natural organic polyelectrolytes formed from the biochemical weathering of plant and animal remains. Their macromolecular structure and chemistry determine their role in biogeochemical processes. In situ spectromicroscopic evidence showed that the HS macromolecular structures (size and shape) vary as a function of HS origin (soil versus fluvial), solution chemistry, and the associated mineralogy. The HSs do not simply form coils in acidic or strong electrolyte solutions and elongated structures in dilute alkaline solutions. The macromolecular structural changes of HSs are likely to modify contaminant solubility, biotransformation, and the carbon cycle in soils and sediments.

Journal Article↗