atorvastatin calcium, the lipid lowering agent, is taken as a model drug characterized by poor water solubility and bioavailability. in this study an attempt was made for preparation of nanocrystals using high pressure homogenization. a number of stabilizers were included as well as polymers at different concentrations, and the formulations were homogenized for ten cycles at a pressure of 1000 ...

Approximately 40 % of newly discovered chemical entities have low solubility and possess bioavailability after oral administration. Lipid-based drug delivery systems (LBDDS) recently become very popular because their remarkable ability to deliver drugs with poor absorption using lipids as carriers. Self-emulsifying (SEDDS) are one type LBDDS employed for the incorporation hydrophobic drugs. SED...

Abstract The objective of present study was to evaluate pharmacokinetic parameters of dibudipine Phytosolve after oral administration in rats. The solubility test was carried out to select suitable oily solvent for dibudipine. Phytosolve formulation was prepared with a medium chain triglyceride (MCT) oil (20%), soybean phospholipids (5%) and a 70% fructose solution (75%). The effect of polyol c...

Abstract Natural products are major molecules for drug discovery due to their structural diversity and interaction with various biological targets, yet clinical application is limited by poor water solubility or low lipophilicity, inappropriate molecular size, dissolution rate permeation, instability, high metabolic rapid clearance. These issues can be solved nanomedicine, improving bioavailabi...

solid lipid nanoparticles (slns) have emerged as an alternative colloidal carriers for sustained release of lipophilic drugs with poor absorption and water solubility. this manuscript describes the effect of process variables on the production of solid lipid nanoparticles (slns) from beeswax and carnauba wax and ketoprofen release from these carriers. it was found that by increasing drug conten...

Drug delivery research areas is continuously broaden and modified as a results of the realization of many factors (such as poor drug solubility and/or absorption, rapid metabolism, high fluctuation in the drug plasma level and variability) adversely affect in-vivo results, in conventional drug delivery system. Lipids are one of the basic building blocks of biological membranes. Nanoscale-based ...

The incorporation of cholesteryl oleate and triolein into phospholipid vesicles was studied in cosonicated mixtures of 94 weight % egg phosphatidylcholine and 6 weight % neutral lipid (0-6% triolein and 6-0% cholesteryl oleate). 13C NMR spectroscopy was used to quantitate both neutral lipids in vesicles containing 90% isotopically substituted [carbonyl-13C]cholesteryl oleate and [carbonyl-13C]t...

Abstract Pyrazinamide (PZA), a medication for tuberculosis, has high aqueous solubility and low permeability, undergoes extensive liver metabolism, exhibits toxicity through its metabolites. To avoid this, PZA in lipid core-shell nanoarchitectonics been formulated to target lymphatic uptake provide metabolic stability the incorporated drug. The UPLC-MS/MS method reliable vitro quantitative anal...

In any lipid bilayer membrane, there is an upper limit on the cholesterol concentration that can be accommodated within the bilayer structure; excess cholesterol will precipitate as crystals of pure cholesterol monohydrate. This cholesterol solubility limit is a well-defined quantity. It is a first-order phase boundary in the phospholipid/cholesterol phase diagram. There are many different solu...

1. A new and rapid continuous assay of rat liver microsomal UDP-glucuronyltransferase (EC 2.4.1.17) has been developed. It is based on measurement of UDP production from UDP-glucuronate during the glucuronidation reaction; UDP production was continuously measured by coupling it to the conversion of NADH into NAD+ through pyruvate kinase and lactate dehydrogenase. This assay is independent of th...