Why is lecithin a good molecule for the formation of micelles




















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Gooding,, William F. DeGrado, and, Robin M. Chemical Reviews , 6 , Bardo,, Cruz Martinez, and, Daniel A. The Journal of Physical Chemistry B , 2 , The polydispersity index P. Tables 1 and 2 and Fig. The optimal formulation ratio for curcumin:lecithin:NaDOC was found to be However, adding lecithin increased the particle size and reduced the EE. Moreover, the F87 and F micelles were more stable and formed at a lower concentration; but adding lecithin increased the particle size.

These two optimal formulations were selected for further evaluation. The MPMs reduced the elimination rate and increased the retention time of curcumin. The potential efficacy of curcumin in treating various diseases is a valuable research topic, and several clinical trials have determined its therapeutic effect.

The pharmacological efficacy and safety make curcumin a prospective compound for treating and preventing various human diseases; however, curcumin has limited clinical applications because of its extremely low aqueous solubility, fast systemic elimination, insufficient tissue absorption, and degradation at an alkaline pH, severely curtailing the BA and limiting its clinical use.

Therefore, the relative low solubility and BA of curcumin constitute a major problem, hindering its clinical use in exerting the maximum therapeutic activity against various diseases. To investigate the potential of using micelles as a drug delivery system for enhancing solubility and BA, the present study used amphiphilic polymers for developing curcumin micelles.

Lecithin, a natural mixture of phospholipids, is a major constituent of cell membranes, nervous tissues, and brain substances. Phospholipids possess a positively or negatively charged head group and a hydrocarbon tail, which has a zwitterionic head group at a physiological pH.

Lecithin is a typical amphiphilic phospholipid with favorable biocompatibility and facilitates encapsulated drug absorption. However, the hydrophobic part alone is too short for forming a micelle. The major factors affecting the particle size, D. Combining TPGS and lecithin also caused precipitation. Furthermore, a small particle size is beneficial for passive targeting to tumor tissues through the EPR effect, cellular uptake, and intracellular trafficking.

Hence, we infer that the small size of the formulated curcumin micelles improved the circulation half-life and enabled avoiding the RES. A major challenge in delivering curcumin to cancerous tissue is its instability and biodegradation at a physiological pH.

Curcumin is stable in the stomach and small intestine but unstable in neutral and basic environments 42 , In PBS and FBS, the micelle formulation increased curcumin stability by protecting the encapsulated curcumin against hydrolysis.

Hence, the formulated system efficiently increased curcumin stability. Curcumin-loaded micelles are designed for improving the BA of the delivered curcumin. Therefore, curcumin-loaded sa MPMs and free curcumin were intravenously injected or orally administered in rats for monitoring the BA.

Our results suggested the slow release of curcumin from micelles, reduced degradation, and prolonged duration increased the BA. The degradation possibly resulted from rapid hydrolysis and biotransformation of curcumin into its glucuronide and sulfate conjugates within a short period. For oral administration, the maximum plasma concentration of curcumin was observed after 0.

The micelle biodistribution mainly depends on components of the hydrophilic shell causing the micelles to stabilize and interact with plasma proteins and cell membranes. Moreover, because of their amphiphilic characteristics, the encapsulated polymers used here have surfactant properties and offer stability and biocompatibility to micelles. For intravenous administration, the aforementioned surface-coated hydrophilic polymers are required for minimizing opsonization and for prolonging the in vivo micelle circulation.

Conclusively, we reported a simple and cost effective formulation composed of lecithin-based MPMs that was able to achieve the same degree of improvement in PK profiles and BA of curcumin as those reported PLGA formulations which was an expensive material 13 , 14 , 44 , The current sa MPMs system for curcumin demonstrated that when curcumin-loaded sa MPMs were orally administrated, the time to achieve maximum plasma concentration of curcumin Tmax was shortened from 1.

It indicates that sa MPMs is able to not only improve the solubility of curcumin but also enhance its permeability through intestinal epithelial cells resulting in a significantly shorter Tmax, higher Cmax and larger BA. Ultimately, the process to produce lecithin-based sa MPMs is also simple and easily reproducible and preparable on a large scale.

Considering the potential of micelles as a drug delivery system, the present study involved developing and characterizing lecithin-based curcumin sa MPMs for improving the curcumin BA. For intravenous administration, the absolute BA increased 2. Thus, the slow release of curcumin from micelles, reduced degradation, and prolonged duration possibly increased the BA.

Lecithin-based sa MPMs improve the solubility, stability, and BA of curcumin, representing an efficient delivery system. Therefore, increasing the curcumin BA by using lecithin-based sa MPMs can make curcumin a prominent therapeutic agent for treating human disorders.

Curcumin-loaded sa MPMs were prepared using a thin film method, as previously described The unincorporated curcumin aggregates were removed by passing the solution through a 0. The characteristics of the curcumin-loaded sa MPMs, namely the average particle size and size distribution, E. The average diameter and size distribution Polydispersity index, P. The mobile phase was a mixture of methanol and 0. On determining the curcumin concentration from the validated calibration curve, the E.

At a predetermined time-point, the particle size of the curcumin-loaded sa MPMs was analyzed for evaluating the stability of their product. At a predetermined time-point, the particle size of the curcumin-loaded sa MPMs was analyzed for evaluating their stability in plasma. Drug release from the curcumin-loaded sa MPMs was assessed using the dialysis bag method, in which 0.

One milliliter of curcumin-loaded sa MPMs or a free curcumin solution i. All measurements were conducted in triplicate. For comparison, curcumin release from a free solution under the same conditions was assessed. Blood samples were collected in heparinized tubes from the jugular vein at 0. Separation was achieved using a BEH C 18 column 2.

The system delivered a constant flow at 0. During analyses, the ESI parameters were set as follows: capillary voltage, 3. PK parameters were represented as the mean and standard deviation SD from individual rats from each group and were estimated through noncompartmental analysis. The terminal elimination rate constant K e was estimated from the slope of the log—linear phase of a graph of the declining plasma concentration of curcumin versus time. A 2-tailed p value less than 0. How to cite this article : Chen, L.

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