Gautam college of pharmacy, Hamirpur, Pin code 177001
Creating a coenzyme Q10 (CoQ10) microemulsion system with enhanced solubility, penetration, and wound healing effectiveness was the aim of this study. The material was chosen and verified to be nanosized (less than 20 nm) and thermodynamically stable using the pseudo-ternary diagram in accordance with the results of tests for thermodynamic stability and dilution. Compared to microemulsions with a surfactant/co-surfactant Greater penetration efficacy was achieved by the CoQ10-loaded microemulsion at a (S/Cos) ratio of 3:1 or 4:1 (w/w%). Additionally, fibroblasts and keratinocytes demonstrated a rather rapid wound-healing response to the CoQ10-loaded microemulsion made of isopropyl myristate (IPM), Cremophor EL, and Transcutol HP at a 2:1 S/Cos ratio." A microemulsion based on IPM, Cremophor EL, and Transcutol HP may be a useful tool for topical CoQ10 distribution and for giving other drugs that have problems with oral absorption, according to these studies.
The body's outermost layer, the body's initial defence against ambient physical, chemical, and biological factors is the skin, including moisture, UV rays, and toxins and drugs. (Pathogen and allergen) (1). The nucleated epidermis provides additional essential elements such cell-cell junctions and cytoskeletal proteins, but the stratum corneum makes up the majority of the physical barrier (2). Important to innate immunity is the chemical or biochemical barrier include macrophages, hydrolytic enzymes, lipids, acids, and antimicrobial peptides (3). Immune system components that are humoral and cellular make up the (adaptive) immunological barrier (4). Water loss in the Stratum corneum hydrates its outer layers, preserving flexibility and facilitating enzymatic reactions that drive its maturation(5). The stratum corneum layer at the outermost layer controls the flow of water and chemicals between the organism and its surroundings, determining the skin's barrier qualities(6). These include techniques like microdialysers, quantitative autoradiography, extraction, and skin layer stripping(7). Consequently, "a system of water, oil, and amphiphile which is a single optically isotropic and thermodynamically stable liquid solution" is a microemulsion(8). In microemulsions, which are carriers that are thermodynamically stable, Water and oil are stabilized by amphiphiles like co-surfactants and surfactants. These systems pharmacological stability, ease of manufacturing, and scalability make them typically beneficial(9) The creation of dispersions occurs when the appropriate amounts of oil, water, and surfactant or cosurfactant are mixed. The excipient selection is limited, and the medication The mode of administration needs to be biocompatible. Plant and vegetable oils, triglycerides, fatty acid esters, corn, cottonseed, orange, clove, peppermint, eucalyptol, and coconut (e.g., ethyl oleate, isopropyl myristate, or IPM) have all been utilized as oil components in the creation of biocompatible microemulsion.
Fig 1: Skin
Interactions that result in increased penetration include the disruption or disintegration of SC lipids, contact with SC proteins, skin hydration, strengthening drug partitioning into the skin or improving drug solubility in the vehicle (8) . For example, a lower melting point and greater solubility for testosterone resulted from a combination of eutectic production between menthol and testosterone as well as between menthol and skin lipids. Additionally, it altered the properties of the skin's barrier, which enhanced the drug's delivery Adenosine triphosphate and cellular energy are produced by Coenzyme Q10 (CoQ10), which is found inside the inner mitochondrial membrane. The poor solubility and dispersibility of CoQ10 in polar solvents like ethanol and water is one of the biggest obstacles to its use as a supplement. According to Terao et al. CoQ10 is less than 0.1 μg/m soluble in water. Intake of CoQ10 has been shown to reduce the signs and symptoms of early Parkinson's disease and Huntington's. formulations based on oil and oil-in-water (O/W) emulsions, which are aqueous solutions with a dispersed oil phase and encapsulate a variety of poorly soluble compounds, are typically made using equipment like an extruder and energy-supplying high-pressure homogenizer to expand the water/oil interfacial area.\ These conditions have been successfully treated by CoQ10, and several clinical studies are looking at its potential as a medication or dietary supplement(8). Because of their special properties, which include their ability to increase Lipids are now very sought-after options for oral formulation carriers because of their ability to transform enterocyte-based drug transport and disposition, attract intestinal lymphatic drug transport, and make water-insoluble medications soluble in the intestinal environment. CoQ10 has drawn interest for its potential use as a treatment for a number of illnesses, such as cancer, diabetes, and cardiovascular disease The benefits of CoQ10 for the skin have been clearly shown in recent research, and they are associated with improved fibroblast proliferation, shielding cells from oxidative damage and producing basement membrane constituents, such as collagen Fibers, keratinocytes, and lamina (9). In order to increase the likelihood of skin irritation, they must be effective as skin penetration enhancers they must be used in high concentrations. As a result, using cyclodextrin as a chemical penetration enhancer results in inadequate transdermal distribution of potential medication molecules Because of its biophysical qualities (hydrating power) and good sensory qualities (fast penetration, merging textures), nano emulsion is easily used in skin care. The significant potential for drug solubility(9) in the NE system may raise the skin's thermodynamic activity The NE internal phase's readily adjusted drug affinity, which separates into the stratum cornea, increases the pace at which the medicament penetrates the cornea This review's objective is to present the state of the art on microemulsions' ability to solubilize oral medications and nutraceuticals, which are naturally occurring substances that have health advantages. This review does not include theories of drug release, bioavailability, or microemulsions Numerous Additional potential medications Studies have been conducted on the use of microemulsions in cell-targeting or peptide formulations for intramuscular delivery. and pulmonary intra-vaginal or intrarectal administration delivery systems for lipophilic drugs such microslides, steroids, and hormones .The stratum corneal lipid lamellae are Oleic acid breaks down a mixture of water and ethanol, as demonstrated by this study. However, this investigation demonstrated that iontophoresis did not enhance AVP penetration via linoleic prepared skin. Drug permeation across the skin can be promoted by chemicals belonging to many different chemical groups, such as: alcohols, polyols, long-chain fatty alcohols, acids, esters and alkyl methyl sulfoxides, terpenes, a zones, surfactants, and others(9-10). Since the subsequent layer is hydrophilic, a hydrophobic material can enter the SC with ease but stays stored there. The skin's barrier qualities are determined by the outermost stratum corneum layer, which also controls the flow of water and chemicals between the body and its surroundings. When water, oil, and surfactant/cosurfactant are combined in the right amounts, the dispersions are created (9). Because surfactants and cosurfactants are present, the interfacial layer protects the encapsulated medications in the microdomains from enzymatic destruction while also facilitating membrane permeability (9). various triglycerides and fatty acid esters, including isopropyl myristate (IPM) and ethyl oleate, have been used as oil components in the production of biocompatible microemulsions. For instance, prior research has shown that consuming CoQ10 slows the development of ventricular dysfunction, arrhythmias, angina pectoris, and chronic heart failure. Small compounds that preferentially travel across the intercellular pathway are known as penetrants. Diffusion rates are determined by physicochemical properties including solubility, hydrogen bonding ability, and molecular weight or volume, as well as lipophilicity. When it comes to skin conditions, transdermal drug delivery is more practical than oral drug delivery since direct application permits more buildup of the medicine at the target with fewer negative consequences (such systemic toxicity). Furthermore, according to previous investigations, Anti-inflammatory and wound-healing properties were demonstrated by CoQ10. Consequently, improving reaching the deep layers of the epidermis by penetration into (10)the stratum corneum without producing significant absorption into the blood circulation is the true difficulty of antioxidants . Measurements of viscosity and conductivity, as well as more sophisticated techniques NMR dynamic light scattering (DLS), cryo-TEM, pulsed gradient spin echo (self-diffusion), small angle X-ray scattering (SAXS), small angle neutron scattering (SANS), and, are some of the key techniques pertinent to the characterization of the microemulsions (9)
Advantages:
Due to their extremely small droplet sizes (20–200 nm), microemulsions have a larger surface area and better allow lipophilic CoQ10 to access layers of viable skin by penetrating the stratum corneum (10).
Fig 2: Skin penetration.
Despite being poorly soluble in water, CoQ10 dissolves well in microemulsions' oil phase. This system guards against oxidation and photodegradation of CoQ10 by utilizing antioxidants, such as vitamin E (11).
By serving as reservoirs, microemulsions can release CoQ10 gradually over a longer period of time, enhancing its antioxidant effects on the skin (12).
Fig 3: Controlled Released
Glycerine, hyaluronic acid, and panthenol are examples of hydrophilic ingredients in the microemulsion that improve hydration, strengthen the skin barrier, and work in concert with CoQ10's restorative properties (13).
Fig 4 Skin Hydration
5. Thermodynamic Stability
Because microemulsions are thermodynamically stable, they are less likely to undergo phase separation while being stored than ordinary emulsion (14).
They typically have lovely skin, are transparent, and aren't oily, all of which are crucial for customer acceptability (15).
For multipurpose skin-regeneration products, formulation flexibility enables the addition of co-actives (panthenol, vitamin E) and penetration enhancers (16).
Disadvantage:
1.Potential Irritation from Surfactants
If microemulsions are not carefully chosen, their comparatively high surfactant/co-surfactant concentrations could irritate delicate skin or damage the barrier (17).
2. Limited Drug Loading
Even though CoQ10 is lipophilic, the amount that can be added without making the microemulsion unstable is still limited (18).
Fig 5: Limited drug loading
3. Stability Concerns Under Stress
Even though they are thermodynamically stable, microemulsions can become unstable when exposed to extreme temperature changes or dilution, such as when combined with other cosmetics (19).
4. Packaging Challenges To stop CoQ10 deterioration, they need non-reactive, oxygen-and light-protected packaging; the price may be greater (20)
5. Regulatory & Safety Testing
For regulatory approval, more irritation/safety studies might be necessary due to their unique nature and penetration enhancer application (21).
6.Formulation Complexity Choosing the right surfactant/co-surfactant ratios and creating a strong pseudo-ternary phase diagram can take a lot of effort and resources (22)
7. Shorter Shelf-Life Without Proper Antioxidants
Choosing the right surfactant/co-surfactant ratios and creating a strong pseudo-ternary phase diagram can take a lot of effort and resources (23).
Materials :
CoQ10, oleic acid (OA), and isopropyl myristate (IPM) were provided by Japan's Tokyo Chemical Industry (TCI); Gatepost (Gatepost, France) supplied Labrafil M1944, Labra sol, and Transductal HP; Daesung Chemicals (Daesung, Korea) supplied cottonseed oil; the Duskin Corporation (Duskin, Korea) supplied Propylene glycol (PG) and polyethylene glycol (PEG) 400 by Tween 80, Sigma–Aldrich (St. Louis, MO, USA). supplied Cremophor EL (Calliphora); and ethyl (Dusan, Korea) and HPLC-quality isopropyl alcohol were present (24).
Quantitative Analysis of CoQ10 :
A mobile phase made of a 75:25 v/v % ethyl alcohol isopropanol mixture was used to dilute each supernatant. To separate the particles, 5 μm, or 4.6 × 150 nm, particles, in the C18 column, Young Jin Biochrome Aegis Pak, Sonograms, Korea) was utilized. In all studies, The Hitachi Lunchroom Elite The HPLC L-2000 series, a pump L-2130, a column oven L-2300, and an autosampler L-2200 were utilized. " The settings were column temperature, injection volume (20 μL), detection (275 nm), and flow rate (1 mL/min) (25).
Construction of Pseudo-Ternary Phase Diagram :
At room temperature, the chosen oil, water, and the surfactant and co-surfactant mixture were all displayed in pseudo-ternary phase diagrams using the titration method. HPLC (Hitachi Lach Rom Elite, Tokyo, Japan) is an experimental surfactant and co-surfactant range chromatography method that optimally maintains hydrophilic and lipophilic balance (HLB) For creating the o/w microemulsion, the range is 10 to 13. Before using experimental testing methods, the surfactants Labra sol, Tween 80, and Cremophor EL were theoretically chosen. The experimental investigation first chose a suitable surfactant. To put it succinctly, a pipette (PIPETMAN®, Gilson, France) This approach involved adding 3 mL of each surfactant solution (15 w/v%) to 5 μL of each type of oil. while providing gentle magnetic stirring until the mixture became somewhat confused. The amount of oil required for emulsification was noted During the titration procedure, each sample was shaken until it reached an equilibrium state. In order to assess the surfactants' capacity for emulsification The oil and surfactant mixes were homogenized and then diluted(25-26) with double-distilled water A UV spectrophotometer was used to measure the transmittance at 650 nm after the produced emulsions had been stored for one hour. Additionally, an acceptable co-surfactant was chosen within the range of the microemulsion zone created by the oil and surfactant.. Following the initial 1:1 ratio of the surfactant/co-surfactant (S/cos) combination, the following weight ratios of oil and S/Cos mixtures were developed: were used to generate the pseudo-ternary diagrams: 1:8; 1:9. 1:6-7, 1:5, 1:4, 1:2, 1:1, 1:0.7, 1:0.43, and 1:0.11. We used the water titration approach to create the pseudo-ternary phase diagrams. The S/Co's mixture was chosen and stirred at room temperature after dropwise additions of double-distilled water to a specific volume of oil(26). When the solutions were hazy during titration, the microemulsion's and other phases' borders were noted and evaluated for turbidity and transparency (26).
A CoQ10-Loaded o/w Microemulsion is prepared by:
Using 5% to 15% oil, 30% to 60% S/Co’s mixture, and 40% to 60% double-distilled water, different formulations were developed using phase diagrams based on the first experiment, incorporating CoQ10(27). To put it briefly, CoQ10 was slowly dissolved into the oil and S/Coos mixture that had been previously weighed. After adding the specified amount of water, the mixture was sonicated to produce a clear liquid. The dilution test and the thermodynamic stability test were used to assess each formulation to enhance the o/w microemulsion loaded with CoQ10 (27).
Permeation Experiment
Membrane Permeation Experiment in Vitro:
There between the donor and receiver compartments of the Franz diffusion cell device was a semipermeable polycarbonate membrane (0.4 μm, Whatman 800282). Nucleopores TM, NJ, USA, GE Healthcare Bio-Sciences Corp.). Next, at 37 °C, Under the membrane, the receptor compartment was filled with 9 mL of media without creating any bubbles (28). After making the CoQ10-loaded o/w microemulsion, the donor compartment was filled. The donor compartment was filled with two grams of each microemulsion. "The control was supplied with the same quantity of CoQ10 simultaneously dissolved in a solution of 1% sodium lauryl sulphate . HPLC was used to track and quantitatively analysed the CoQ10 penetration as previously mentioned (28)
In Vitro Skin Permeation Experiment
A receptor compartment Additionally, the Franz diffusion cell equipment used to investigate skin penetration had an effective penetration area of 1.43 cm³. Inje Institutional Animal Care and Use Committee of the University (IACUC) procedure (IACUC 2019-015) was approved on September 26, 2019, so We collected and used the recently removed skin from female hairless mice (SKH-1)(28-29) .In short, the adhering Phosphate-buffered saline (pH 7.4) was used to wash the mouse skin after the fat layer was removed. Following that, In the Franz diffusion cell apparatus system, the skin was positioned in between the donor and receptor compartments. After that, The receptor space under the epidermis received 9 mL of medium without producing any bubbles(28) . After the system was ready, the donor compartment also received two grams of each chosen microemulsion. Additionally, the control group received the same quantity of CoQ10, which was diluted with 1% sodium lauryl sulphate(27-28). To get rid of the extra The skin was treated with CoQ10, removed the following day, Phosphate-buffered saline was used for washing. Each skin was cut apart and sonicated to release the CoQ10 (29)
Physicochemical analysis of the o/w microemulsion loaded with CoQ10: (30)
A dilution test and thermodynamic experiments were used to determine the best composition for three formulations (F2, F10, and F18). The CoQ10-loaded microemulsions' droplet size and zeta potential are displayed. Additionally, measurements were made of the formulations' pH and CoQ10 medication concentration. Each microemulsion's size was less than 20 nm, according to the results, and there was no discernible variation. Because of the (30) low polydispersity index close to zero, all formulations displayed uniform droplet size, even if it was relatively low in comparison to F10 and F18. Each formulation's zeta potential value, which varied from -11 to -15 mV, was rather negative . The approximately 100% showed that CoQ10 was well-entrapped in the oil phase made of IPM. drug content of each formulation, irrespective of the S/Cos ratio While their S/Cos ratios and compositions have varied so far, F2, F10, and F18 as a group showed no appreciable variations in the microemulsion's physicochemical characteristics (31).
The impact that COQ10 has on skin regeneration:
Cell proliferation Before the skin regeneration project was initially evaluated in the representative skin cell lines, NIH3T3 fibroblast cells and keratinocyte cells that are HaCaT. The representative skin cell lines are NIH3T3 fibroblast cells and the cells. Both cell lines' proliferation was enhanced in each set of trials, and F2 showed no cytotoxicity in comparison to the control. ."In order to demonstrate the improved impact the effects of CoQ10 on skin regeneration. The cell scratch test, also called the wound healing assay, was employed in vitro, was carried out following the results(30-32). "In order to evaluate the process of wound healing and mending, the cell scratch test was used in our experiment on keratinocytes and fibroblasts. Following scratching, which was observed for 36 hours, the cells in both cell lines moved in the direction of the provisional gap. "Every fibroblast and keratinocyte picture was displayed in In comparison to the F2-treated group under control (the top line)) showed a comparatively a comparatively poor influence on wound healing and a slow migration pace. The F2-treated cohort demonstrated a faster rate of wound healing in both cells as compared to the(The bottom line. Both cells showed that the F2-treated group was more effective than the control group at wound healing(32). For example, F2 had a 98.95% greater effect on wound closure in HaCaT cells than the control group. Under microscopic examination, After a 24-hour exposure, for example, F2 in HaCaT cells accelerated wound closure, producing a wound healing zone. At the same time point after a 24-hour exposure under a microscope, Of the cells in the other group, 98.95% of the wound healing region was visible, compared to 55.44% in the control group. Moreover, the control group's cells showed 55.44% of the area that is healing from the wound simultaneously(32-33)
Protransfersome (Protransf-CoQ10) loaded with CoQ10 is prepared
With Tween 80, oleic acid, and L-α-phosphatidylcholine made up the protransfersome, which was synthesized using a modified version of the Gupta method. (2012). CoQ10 was initially stirred in an oleic acid and Tween 80 solution until completely dissolved. Lastly, to create Protransf-CoQ10, The Stirring was done until the L-α-phosphatidylcholine was dissolved (34)
Emulgel preparation with a protransfersome loaded with CoQ10
To make a CoQ10-loaded protransfersome emulgel,The emulgel foundation was supplemented with Protransf-CoQ10 at a final concentration of 1% CoQ10. To create a homogenous emulgel basis, Span 80 and Tween 80 were combined 1:1 with Carbopol 940)(35). and then Triethylamine (TEA) was added to bring the pH down to 6.0 ± 0.2. The emulgel base was then mixed homogeneously with CoQ10 powder, CoQ10 solution in oleic acid and Protransf-CoQ10 to produce three distinct kinds of emulgel: CoQ10-Ole, Protransf-CoQ10, and CoQ10, in that order (36).
CoQ10-loaded protransfersome emulgel (Protransf-CoQ10 Emulgel) preparation (37)
By incorporating A protransfersome emulgel loaded with CoQ10 was produced by incorporating with a final CoQ10 content of 1%, the Protransf-CoQ10 into the emulgel base(37). In order to create a homogenous emulgel basis Triethylamine Tween 80 and Span 80 (1:1) were combined with (TEA). after Carbopol 940 was added to Reduce the pH to 6.0 +/- 0.2. After adding Protransf-CoQ10, CoQ10 solution in oleic acid, and CoQ10 powder to this emulgel foundation, they were thoroughly mixed to create Protransf-CoQ10 emulgel, CoQ10-Ole emulgel, and CoQ10 emulgel, respectively (38).
Factor to be considered of formulation
1) Therapeutic & Targeting Strategy
2. API (CoQ10) Considerations:
3.Vehicle Design (Microemulsion):
4. Skin Penetration & Regeneration Aids:
5.Rheology & Aesthetic Conversion:
6. Process & Scale-Up:
7.Critical Quality Attributes (CQAs):
8.Efficacy & Safety Testing:
9. Preservation & Compliance:
10. Packaging & Shelf-Life:
Evaluation parameter:
1). Appearance & Basic Physicochemical:
2). Globule Metrics (Critical Quality Attributes):
3). Thermodynamic/Physical Stability:
4). CoQ10 Assay & Quality:
5) In-Vitro Release & Permeation:
6) Skin Regeneration & Bioactivity Markers:µ
7) Safety & Irritation:
8) Product Performance on Skin (In-vivo/Clinical/Instrumental): (81)
9) Formulation Compatibility & Packaging:
10) Regulatory/Documentation (QbD-friendly):
Identification Test :
A) Compendial ID (Core):
1) FT-IR match (EP/JP style):
Purpose: In accordance with the official reference standard (CRS), CoQ10 functional groups are confirmed (89).
Sample preparation (from microemulsion):
2) HPLC–UV retention time match (EP/USP style):
Purpose: Chromatographic behaviour for orthogonal identification (92).
Sample preparation :
B) Supportive / Rapid Screens (Use alongside A or B):
3) UV–Vis λmax confirmation
Purpose: Look for the oxidized CoQ10 (ubiquinone) chromophore quickly. (97)
Sample preparation: In ethanol or isopropanol, extract; dilute to approximately 5–15 µg/mL.
Test:Scan200–400nm.
(98).
Acceptance:
The absorbance ratio is in line with the reference solution, and the λmax is prominent at 275–278 nm with the expected spectral shape. (Only use in complex matrices as a supporting ID; do not use it alone.) (99).
4) TLC Rf match (screen)
Plate: 60 F??? silica gel. Mobile phase (for instance): 9:1 (optimize) n-hexane: ethyl acetate Detection: UV at 254 nm; iodine vapor is optional.
Acceptance: A positive spike test (co-spot overlays) and a single orange-yellow spot for testing with the Rf ≈ reference. (The qualitative ID approach is documented as appropriate; internal validation is conducted.) (100).
C) Enhanced Specificity (when matrix is complex):
5) HPLC with peak-purity (PDA) or LC-EC
6) Orthogonal LC–MS (if available)
D) Practical notes for a Microemulsion Matrix
Minimal ID Package for Batch Release (suggested)
Current and Future Developments:
Clinical signals for anti-ageing are positive but modest
CONCLUSION
According to our research, the microemulsion was a thermodynamically stable and efficient CoQ10 carrier. Following topical treatment, the optimized CoQ10-loaded microemulsion showed improved skin accumulation and a better release profile. Better wound healing efficacy was also demonstrated by the microemulsion in fibroblasts and keratinocytes, two essential cells for skin regeneration. Given their superior solubilizing properties and thermodynamic stability, which can be applied to other pharmaceutical components, such microemulsions may be a desirable carrier for pharmaceutical and cosmetic applications. They wouldn't cause skin irritation or toxicity when used topically. Because of has enhanced penetrating effectiveness and excellent solubility, microemulsions as drug carriers have the potential to be more advantageous than traditional formulations (such as creams, lotions, and gels) from a scientific standpoint. From an industrial standpoint, this is because of its minimal preparation costs and simplicity of scaling up, which may enable a greater variety of transdermal and topical uses.
ACKNOWLEDGEMENT:
We are deeply appreciative of the Gautam College of Pharmacy's ongoing assistance and collaboration in completing this job.
REFERENCES
Kumari Varsha, Tanvi Kapil, Mohit Sharma, Dr. Sanjay Kumar, Formulation and evaluation of microemulsion based delivery system for the Co- encapsulation of coenzyme Q10 and hyaluronic acid for skin aging, Int. J. of Pharm. Sci., 2026, Vol 4, Issue 2, 3258-3274. https://doi.org/10.5281/zenodo.18714316
10.5281/zenodo.18714316
