Nanoemulsion Formulation Research Articles

Interfacially Modified Hybrid Nanoemulsion-Based Alginate Capsules: A Novel Food Grade System with Enhanced Oxidative Stability of Linoleic Acid with a Potential Antioxidant Property

Development of hybrid formulations of hydrogels, antioxidants, and nanoemulsions containing polyunsaturated fatty acids is highly demanding. Herein, we report the formulation of quercetin-loaded oil-in-water nanoemulsions fabricated with surfactants like Tween 20 (nonionic), sodium salt of lauroyl sarcosine (anionic), and 3-(N,N-dimethylmyristylammonio)propanesulfonate (zwitterionic) for controlling autoxidative degradation of linoleic acid. Having a droplet size <200 nm, nanoemulsions containing anionic and zwitterionic surfactants were more effective in controlling lipid peroxidation at 37 °C. The size of their hybrid alginate capsules ranged from 2.00 to 2.30 mm that released quercetin and scavenged DPPH· (1,1-diphenyl-2-picrylhydrazyl) in saline media with a free radical scavenging activity of ∼80% from capsules rich in zwitterionic surfactants. High percent swelling of capsules (approximately 600–700%) and >90% percent recovery make the capsules highly robust. These formulations have potential to provide promising platforms for the enhancement of shelf life of linoleic acid and rational formulation of quercetin-containing supplements in food and pharmaceutical industries.

Natural Oil Nanoemulsion-Based Gel Vehicle for Enhancing Antifungal Effect of Topical Luliconazole

Background: Luliconazole, a newer class of imidazole anti-fungal agent, is very effective against several species of fungi, especially dermatophytes. It has very low aqueous solubility acting as barrier for topical delivery and limiting its dermal availability. Aim of the study: This study aimed to formulate luliconazole oil/water nanoemulsion by the aqueous titration method. Methods: Solubility study resulted in selecting peppermint oil, tween 80 and transcutol p as oil phase, surfactant and cosurfactant respectively, although pseudoternary phase diagram construct nanoemulsion area for picking formulations. Fifteen o/w nanoemulsion formulations prepared and characterised for droplet size, polydispersity index, pH values, percent transmittance, luliconazole content. Among formulations, eight preparations introduced to enhance the viscosity of prepared nanoemulsion by combining 0.5% carbopol 934 as gelling agent. Results: The selected preparations demonstrated homogeneous nanoemulgels with pH values appropriate for skin application and accepted luliconazole content. Viscosity results manifested non-newtonian pseudo plastic behavior with shear-thinning viscosity profile. In vitro release studies revealed dissimilar release profile (f2˂50) than that of pure luliconazole dispersion. The results revealed that the formula NG-1 with oil: Smix(2:1):water (15:40:43.5) ratio containing 1% drug and 0.5% carbopol 934 was the optimised formula with excellent spreadability. Conclusion: The study concluded that nanoemulsion-based gel is contemplated an encouraging and proceed technique for the topical preparation and upgrade solubility, dissolution rate and permeability of insufficient water-soluble drugs across the skin.

Ultrasonication for preparing high-performance phase change material nano-emulsions: Optimization and characterization

This work was aimed to optimize the formulation of phase change material nano-emulsions by ultrasonic emulsification that has not been investigated systematically. The optimization was performed using response surface methodology on two response parameters, average droplet size and apparent viscosity, and three independent variables including ultrasonic amplitude (X1), treatment time (X2), and surfactant content (X3). The significance of three variables on both droplet size and apparent viscosity followed the order of X3 > X1 > X2. At the optimal variable levels (X1 = 58 %; X2 = 9 min; X3 = 8 wt%), the droplet size of 118.2 nm and apparent viscosity of 7.3 mPa·s were predicated by the regression model and also well verified by experiments. The 25 wt% phase change nano-emulsion formed by ultrasonication exhibited the best emulsion stability and the lowest apparent viscosity compared with those formulated by high-energy rotor-stator homogenizer and low-energy method of phase inversion temperature. In addition, the rheological behavior associated with the average droplet size and the solid/liquid state of phase change material was illustrated numerically for the first time. In general, a threshold of 170–180 nm was found for the transition of liquid-in-water emulsions from a shear-thinning non-Newtonian fluid to a Newtonian fluid in the shear rate range of 0.6–73 s−1. All solid-in-water suspensions showed shear-thinning fluid behavior, though the shear-thinning degree was dramatically reduced to a flow behavior index of about 0.95 as the particle size was below 100 nm. These findings may be useful for designing high-performance phase change material nano-emulsions with long service life, high energy storage capacity, and low pumping power consumption for applications.

Quantitative PET tracking of intra-articularly administered 89Zr-peptide-decorated nanoemulsions.

Intra-articular (IA) administration of drugs for the treatment of diseases such as rheumatoid arthritis, osteoarthritis and psoriatic arthritis is a common strategy; however, the rapid clearance from the synovial fluid restricts their effectivity due to the limited retention time. Drug Delivery Systems (DDS) are currently being developed to increase their joint retention time. This study compares the biodistribution and retention time of a senolytic peptide (PEP), with potential application in osteoarthritis disease, and this senolytic peptide encapsulated in a DDS based on a lipid nanoemulsion (PEPNE) by using positron emission tomography (PET) imaging. To this aim, the PEP was conjugated with a chelating agent (DFO) and radiolabeled with zirconium-89 (89Zr). Then, [89Zr]-PEP was encapsulated in a novel nanoemulsion formulation, composed by vitamin E, sphingomyelin, and a lipid-PEG. Afterward, healthy rats were administered with either the [89Zr]-PEP or the [89Zr]-PEP-NE via IA injection and underwent PET scans at 0.5-, 24-, 48-, 72-, 168-, 240- and 336h post-injection. To assess the biodistribution of both radiotracers, several volume-of-interest were manually drawn in different organs of the rat body and the %ID/organ was calculated. The [89Zr]-PEP was successfully encapsulated in the NE and their physicochemical properties were minimally affected by the radiolabeling buffer. Adequate stability of both [89Zr]-PEP and [89Zr]-PEP-NE was found in synovial fluid over 72h. Quantitative data from PET images revealed a significantly higher [89Zr]-PEP-NE retention in the injected knee than with [89Zr]-PEP in all follow-up PET scans. The [89Zr]-PEP %ID/organ values in the liver and kidney were significantly higher than those from [89Zr]-PEP-NE, which might indicate a faster elimination of the [89Zr]-PEP. Therefore, the study highlights the higher retention time on the target site of the [89Zr]-PEP-NE which may improve the therapeutic effects of the peptide. Thereby, the novel nanoemulsion formulation seems to be a successful DDS for IA injection. In addition, these results represent the first study that evaluates the distribution of a PET-guided DDS after its IA administration.

Formulation Development and Evaluation of Apremilast Nanoemulgel for Enhancing Permeability

Background: Oral apremilast, a selective phosphodiesterase-4 inhibitor, is effective in the treatment of moderate to severe plaque psoriasis and acute psoriatic arthritic disease. According to BCS categorization, it is a class IV medication, which denotes low solubility and lesser permeability through the skin. Objective: The objective of the research is to develop a nanoemulsion that will increase apremilast’s skin permeability. Utilizing a simplex lattice design, an optimised nanoemulsion has been developed, and then transformed into a gel form and created as a nanoemulgel. Method: The nanoemulsion was developed by selecting the oil, surfactant, co-surfactant, and cosolvent, in that order, based on the solubility study, and was then evaluated based on various criteria. Different grades and concentrations of carbopol polymer were used to make nanoemulgel, which was then tested for physicochemical parameters like pH, viscosity, spreadability, extrudability, percentage of drug content, percentage of drug diffusion, skin permeation, and skin retention. For skin irritancy tests, male Wistar albino rats weighing between 200 and 250 g were used to find out how likely it was that apremilast-loaded nanoemulgel would cause skin irritation. Result: The nanoemulsion formulation A5 containing 10% Captex 355 and 40% Smix in a 3:1 ratio of Cremophore RH 40: Labrafil showed the smallest particle size and greatest drug diffusion. In comparison to other formulations of emulgel, the 0.75 % concentration of carbopol 940 produced the best results. Conclusion: A stable nanoemulgel system with apremilast loaded was created, and a number of process factors were assessed. The optimised batch produced repeatable results when evaluated, exhibited no skin irritation, and was shown to be stable after three months at ambient conditions of temperature and humidity.

Loteprednol-Loaded Nanoformulations for Corneal Delivery by Quality-by-Design Concepts: Optimization, Characterization, and Anti-inflammatory Activity.

Loteprednol etabonate (LE) is a topical corticosteroid that uses inflammatory conditions of the eye. It has a low ocular bioavailability and side effects such as corneal disorder, eye discharge, and ocular discomfort. Therefore, it was decided to select the delivery systems, which are solid lipid nanoparticles (SLN), nanostructured lipid carriers (NLC), and nanoemulsion (NE). Design of experiments (DoE) of SLN, NLC, and NE formulations were formulated by using the quality by design (QbD) approach. Precirol® ATO 5 and oleic acid were used as solid and liquid lipids, respectively, in SLN, NLC, and NE formulations. Physiochemical characterization was performed on the formulations. The optimized formulations' inflammatory effects have been appraised on human corneal epithelial cells employing the ELISA test. Physicochemical characterization studies and inflammatory effects were appraised. The sizes of optimized formulations of SLN, NLC, and NE were 86.19nm, 82.38nm, and 126.35nm, respectively, with minimum polydispersity. The release behavior of the formulations is composed of both diffusion and erosion. ELISA test results proved that the formulations significantly reduced IL-1 and IL-6 levels (p < 0.05). D-optimal mixture experimental design allowed us to develop the most precise formulations of SLN, NLC, and NE. Furthermore, the optimized formulations could be promising candidates for treating an inflammation-based corneal disease of the eye.

Formulasi dan Karakterisasi Nanoemulsi Ekstrak Etanol Buah Wualae (Etlingera Elatior (Jack) R.M. Smith)

Wualae (Etlingera elatior (Jack) R.M. Smith) has a high flavonoid content, so it has the potential as an antioxidant and can be used in drug delivery systems, namely nanoemulsions. Nanoemulsions can improve absorption, help dissolve lipophilic drugs and increase bioavailability. This study aims to determine the formulation and characterization of wualae nanoemulsion. The research method used is a low-energy emulsification method. The nanoemulsion is formulated into four formulas with a concentration ratio of tween 80 and PEG 400, namely 50%: 30% (F1), 50%: 10% (F2), 10%: 30% (F3), and 10%: 10% (F4). The characterizations included organoleptic tests, nanoemulsion type tests, viscosity tests, transmittance tests, particle size tests, polydispersity index tests, potential zeta and physical tests, and centrifugation and cycling tests. The results obtained sequentially are F1 has a characteristic odour of clear yellow, type of oil-in-water nanoemulsion, 150 cPa.s, 99%, 14.56 ± 0.666 nm, 0.061 ± 0.017, 1.453 ± 1.23 mV and is stable in the test. F2 has a characteristic odour of clear yellow colour, oil-in-water nanoemulsion type, 900 cPa.s, 97.2%, 13.8 ± 0.781 nm, 0.126 ± 0.066, -5.503 ± 0.57 mV and is stable in difficult tests. F3 has a dirty white type of nanoemulsion oil in 9.5 cPa and is unstable in typical tests. F4 has a characteristic odour of cloudy white colour, oil-in-water nanoemulsion type, 6 cPa.s and is inconsistent in stability testing. Based on the data above, the best wualae fruit extract nanoemulsion formulation is formula 1.

Nanoemulsion Formulation of Lefl unomide for Transdermal Delivery: Preparation and Characterization

Lefl unomide (LEF) is an antirheumatic drug belonging to a class of drugs known as disease modifying antirheumatic drugs, indicated for moderate to severe psoriatic arthritis and rheumatoid arthritis. Orally administrated LEF causes many side eff ects that could result in treatment failure. Hence, in this study, lefl unomide was formulated as a nanoemulsion to develop a transdermal dosage form that can circumvent such side eff ects and increase the rate of successful treatment by improving patient compliance with the medication. The nanoemulsion area was constructed by using pseudo-ternary phase diagrams. A total of 20 nanoemulsion formulas were prepared. These formulas’ mean particle size, zeta potential, and droplet morphology were studied. Thermodynamic stability studies were performed to test the stability of the prepared formulations. Also, the in-vitro release of the drug from the formulations was evaluated using phosphate buff er saline pH 7.4 as the release medium. According to the saturation solubility study results, capryol TM 90 was selected as oil, labrasol and Tween 20 as surfactants for formulation coded A1 and A2, respectively, and transcutol p as cosurfactant together with deionized water as the aqueous phase for the preparation of nanoemulsions. The LEF-nanoemulsion formulations were in the nanosize range (from 54.7–210.2 nm). Images for the chosen formulas revealed dark spherical nanoemulsion droplets against bright surroundings. All of the preparation showed a complete drug release by the end of 220 minutes and the release was highly dependent on the particle size. Based on the result of this study, the prepared LEF-nanoemulsion is successfully prepared and can be considered a promising approach to developing a transdermal preparation.

Enhancing Oil Solubility of BCS Class II Drug Phenytoin Through Hydrophobic Ion Pairing to Enable High Drug Load in Injectable Nanoemulsion to Prevent Precipitation at Physiological pH With a Potential to Prevent Phlebitis

This work investigates the micellar titration of phenytoin (a weakly acidic drug) with cetyltrimethylammonium hydroxide (CTAH) to form a hydrophobic ion-pair to enhance oil solubility of phenytoin, followed by an effort to formulate nanoemulsion that could potentially prevent precipitation of phenytoin at physiological pH. The ion-pair formulated in nanoemulsion was evaluated for in vitro precipitation during serial dilution at physiological pH. The formation of ion-pair during titration was explained in context of pH-solubility data. The mathematical model successfully integrated ionization and micellization equilibria to reflect on dominant mechanisms for solubilization. The micellar phenomenon during titration was confirmed using Dynamic Light Scattering (DLS). The phase changes of the excess undissolved solids during titration were evident from X-Ray Powder Diffraction (XRPD) and Fourier Transform Infrared Spectroscopy (FTIR). This analysis confirmed the conversion of phenytoin into ionized state and its subsequent ionic interaction with CTAH forming hydrophobic ion-pair complex (HIP). The complete ion pair formation was evident at pHmax (8.8 to 9.2), and its 1:1 stoichiometry was confirmed using HPLC (Phenytoin and CTAH) and H1 NMR, hence could also be called as a lipophilic salt. The ion-pair (salt) was insoluble in water and showed remarkably high partition coefficient (log P) in octanol/water. As characterized by Hot Stage Microscopy (HSM), the melting point of the ion-pair complex was lowered to 150.8⁰C compared to the free acid (> 300οC), this was even further lowered to 81.1 °C when evaluated in castor oil. This led to approximately eight-fold higher solubility of hydrophobic ion pair (HIP) in castor oil compared to the free acid form. The high miscibility in castor oil was suitable to formulate a high drug load injectable dispersed system. This was successfully achieved with lecithin and polysorbate as emulsifiers without leaching drug into continuous phase at pH 7.4. This nanoemulsion (<300 nm, and > +30 mV zeta potential) remain stable when evaluated over a period of one month. A serial dilution study of the nanoemulsion was performed in PBS buffer, microscopic observations suggested no birefringence despite incubation at 25°C for several hours. This result indicated that Phenytoin remained strongly partitioned within dispersed oily phase with a higher drug loading when ion-paired phenytoin was used. The higher drug load could enable a small volume slow bolus injection to meet 50 mg/min or lower delivery rate criteria for Phenytoin in the clinical set up. This provided a pathway to further explore potential injectable nano-emulsion formulations that could alleviate typical phlebitis issue associated with the injectable phenytoin solution administration at physiological pH.

Preparation of pumpkin oil-based nanoemulsion as a potential estrogen replacement therapy to alleviate neural-immune interactions in an experimental postmenopausal model

As estrogen production decreases during menopause; the brain's metabolism tends to stall and become less effective. Estrogen most likely protects against neurodegeneration. Consequently, a comprehensive study of the benefits of hormone replacement therapy as a neuroprotective effect is urgently required. This study was designed to fabricate pumpkin seed oil nanoparticles (PSO) in nanoemulsion form (PSO-NE) and investigate their potential role in attenuating the neural-immune interactions in an experimental postmenopausal model.Sixty female white albino rats were divided into six groups: control, sham, ovariectomized (OVX), and three OVX groups treated with 17β-estradiol, PSO, and PSO-NE respectively. Transmission Electron Microscopy (TEM), and particle size analyzer were performed for nanoemulsion evaluation. Serum levels of estrogen, brain amyloid precursor protein (APP), serum levels of nuclear factor kappa B (NF-κβ), interleukin 6 (IL-6), transthyretin (TTR), and synaptophysin (SYP) were evaluated. The expression of estrogen receptors (ER-α, β) in the brain tissue was estimated. The findings revealed that the approached PSO-NE system was able to reduce the interfacial tension, enhance the dispersion entropy, lower the system free energy to an extremely small value, and augment the interfacial area. PSO-NE, showed a significant increase in the levels of estrogen, brain APP, SYP, and TTR accompanied with a significant increased in the expression of brain ER-α, β compared to the OVX group. In conclusion, the phytoestrogen content of PSO exhibited a significant prophylactic effect on neuro-inflammatory interactions, ameliorating both estrogen levels and the inflammatory cascades.

Cinnamon bark oil in water nanoemulsion formulation, characterization, and antimicrobial activities

The nano-emulsion of cinnamon bark oil (CBON) was formulated and investigated for stability and antimicrobial properties. The requisite hydrophilic lipophilic balance (rHLB) and surfactant concentration (Smix) of CBON were found to be 10 and 15%, respectively. A nano-emulsion prepared using 10 g/100 mL CBO and 15 g/100 mL Smix at ultrasonication for 2 min resulted in the smallest droplet size and polydispersity index (PDI) (d = 94.51 ± 0.19 PDI = 0.283 ± 0.009). The droplet size and PDI of the CBO was found to be influenced by HLB value, treatment time, and smix concentration. This study also aimed to evaluate the antimicrobial properties of the prepared oil-in water nano-emulsion of cinnamon oil against E. coli, S. aureus, and S. cerevisiae. The CBON were found to be more efficient in inhibiting and inactivating microorganisms than the crude CBO. The sensitivity of microorganism towards CBON depend on the type of microorganism with S. cerevisiae being the most sensitive followed by E. coli and S. aureus. S. aureus were inhibited with a complete 6 log reduction within 60 min of incubation with CBON. Whereas in the case of E. coli, and S. aureus a reduction of 6 log CFU and 5 log CFU respectively were reported after 120 min of exposure.

Polymer nanoparticles from low-energy nanoemulsions for biomedical applications.

The formulation of nanoemulsions by low-energy strategies, particularly by the phase inversion composition method, and the use of these nanoemulsions as templates for the preparation of polymer nanoparticles for biomedical applications are reviewed. The methods of preparation, nature of the components in the formulation, and their impact on the physicochemical properties, drug loading, and drug release are discussed. We highlight the utilization of ethyl cellulose, poly(lactic-co-glycolic acid), and polyurethane/polyurea in the field of nanomedicine as potential drug delivery systems. Advances are still needed to achieve better control over size distribution, nanoparticle concentration, surface functionalization, and the type of polymers that can be processed.

Loteprednol loaded nanoformulations for corneal delivery: Ex-vivo permeation study, ocular safety assessment and stability studies

Loteprednol etabonate (LE) is a topical corticosteroid that is used in inflammatory and allergic conditions of the eye. Nanoformulations including solid lipid nanoparticles (SLN), nanostructured lipid carriers (NLC), and nanoemulsion (NE) of LE were prepared for increasing its ocular bioavailability and minimizing the risk of side effects. Nanoformulations were prepared using hot emulsification and ultrasonication technique. The stabilities of the SLN, NLC, and NE were studied at different thermal conditions for 180 days. In this context, alterations in particle size (PS), zeta potential (ZP), viscosity, pH, %EE, and thermal behavior of the formulations were determined. Ex vivo corneal permeation study was performed, subsequently, the tape stripping approach was conducted for defining the LE amount that was blocked by the tear film layer. In addition, to determine the LE amount in epithelial tissue, a homogenization test was performed. the PS of the formulations was between 82.23 and 126.9 nm, and ZPs were between −20.8 mV and −24.6 mV. Furthermore, SLN, NLC, and NE formulations were found to be 2.05, 1.86, and 1.39 times higher LE retained in the cornea against the marketed product, respectively. SLN, NLC, and NE might be alternative delivery systems by reducing the amount of LE for each dose and being used safely based on the results both of MTT and histopathological examinations as well.

A Novel Nanoemulsion Formula for an Improved Delivery of a Thalidomide Analogue to Triple-Negative Breast Cancer; Synthesis, Formulation, Characterization and Molecular Studies.

Thalidomide (THD) and its analogues were recently reported as a promising treatment for different types of solid tumors due to their antiangiogenic effect. In this work, we synthesized a novel THD analogue (TA), and its chemistry was confirmed with different techniques such as IR, mass spectroscopy, elemental analysis as well as 1H and 13C NMR. To increase solubility and anticancer efficacy, a new oil in water (O/W) nanoemulsion (NE) was used in the formulation of the analogue. The novel formula's surface charge, size, stability, FTIR, FE-TEM, in vitro drug release and physical characteristics were investigated. Furthermore, molecular docking studies were conducted to predict the possible binding modes and molecular interactions behind the inhibitory activities of the THD and TA. TA showed a significant cytotoxic activity with IC50 ranging from 0.326 to 43.26 µmol/mL when evaluated against cancerous cells such as MCF-7, HepG2, Caco-2, LNCaP and RKO cell lines. The loaded analogue showed more potential cytotoxicity against MDA-MB-231 and MCF-7-ADR cell lines with IC50 values of 0.0293 and 0.0208 nmol/mL, respectively. Moreover, flow cytometry of cell cycle analysis and apoptosis were performed showing a suppression in the expression levels of TGF-β, MCL-1, VEGF, TNF-α, STAT3 and IL-6 in the MDA-MB-231 cell line. The novel NE formula dramatically reduced the anticancer dosage of TA from micromolar efficiency to nanomolar efficiency. This indicates that the synthesized analogue exhibited high potency in the NE formulation and proved its efficacy against triple-negative breast cancer cell line.

Nano Emulsion Drug Delivery System: A Review

Abstract: In nanoemulsions, both oil and water droplets are stabilised by an amphiphilic surfactant. Ultrafine dispersions with varying drug loading, viscoelastic properties, and aesthetic characteristics may be useful for the administration of medication. A 20-500-nanometer droplet size range for nanoemulsions has been established. The biological behavior of a nanoemulsions formulation is heavily influenced by its droplet diameter and surface properties. Small droplet size results in clear emulsions; therefore, the appearance of the product is unaffected even by the addition of an oil phase. Nanoemulsions are oil-in-water dispersions that are transparent or translucent and are stabi-lized by an interfacial layer of surfactants and cosurfactant particles with droplet size smaller than 100 nm. New nanoscience-based technologies are becoming increasingly popular as a means of im-proving food safety, quality, and nutrition. In this field, nanoemulsions have been a key focus since they can be readily manufactured using current food components and technology. Food nanoemul-sions, which are tiny oil droplets distributed in water, are being used as delivery methods for a vari-ety of hydrophobic compounds, including nutrients, nutraceuticals, antioxidants, and antimicrobial agents. The present review is focused on the formulation, characterization, and applications of nanoemulsions.

Nanoemulsion formulation of Lawsonia inermis extract and its potential antimicrobial and preservative efficacy against foodborne pathogens

Formulating plant extracts as nanoemulsions would maximize their use in different applications. This work aimed at formulating henna ( Lawsonia inermis ) extract as nanoemulsion (HENE) and studying its antimicrobial activity on some food-borne pathogens in comparison to the bulk henna extract (HE). The active compounds in henna leaves were extracted by cold solvent extraction method using ethanol and was analyzed using high performance liquid chromatography (HPLC), Fourier transform infrared spectroscopy (FTIR) and UV–visible spectrophotometry (UV–Vis). It was found that the extract is rich in phenolic compounds, mainly, catechin, methyl gallat, elagic acid and coumaric acid. The ultrasonic emulsification was used to prepare HENE with average droplet size of 90 nm as measured by dynamic light scattering (DLS) and transmission electron microscopy (TEM). The antimicrobial activities of HENE on seven pathogenic bacteria ( Bacillus cereus, Staphylococcus aureus, Listeria monocytogenes, Salmonella typhimurium, Escherichia coli, Pseudomonas aeruginosa and Yersinia enterocolitica ) and seven fungi ( Trichoderma reesei, Aspergillus terreus, Penicillium digitatum, Aspergillus niger, Candida albicans, Aspergillus flavus and Saccharomyces cerevisiae ) were compared with HE and penicillin. The preservative efficacy of HENE at 0.03% and 0.05% v/v on yoghurt as a model system over a cold storage period of 15 days was studied. HENE showed higher antibacterial efficacy (P < 0.05) against B. cereus, E. coli and P. aeruginosa . The antifungal effect of HENE exceeded that of both penicillin and HE (P < 0.05), in particular, against P. digitatum, S. cerevisiae and A. terreus (P < 0.001). During storage period of yoghurt, no mold or yeast were detected. • Cold extraction of active compounds of Lawsonia Inermis. • Nanoemulsion formulation of Lawsonia Inermis extract. • Antimicrobial activity of Lawsonia Inermis extract nanoemulsion. • Lawsonia Inermis extract nanoemulsion as natural preservative.

Antibacterial and Anti-Acne Activity of Benzoyl Peroxide Nanoparticles Incorporated in Lemongrass Oil Nanoemulgel.

The goal of this study was to make Benzoyl Peroxide (BPO) nanoemulgel to improve its ability to kill bacteria. BPO has trouble getting into the skin, being absorbed by the skin, staying stable, and being spread out. A BPO nanoemulgel formulation was prepared by combining BPO nanoemulsion with Carbopol hydrogel. The drug was tested for solubility in various oils and surfactants in order to select the best oil and surfactant for the drug, and then the drug nanoemulsion formulation was prepared using a self-nano-emulsifying technique with Tween 80, Span 80, and lemongrass oil. The drug nanoemulgel was looked at in terms of its particle size, polydispersity index (PDI), rheological behavior, drug release, and antimicrobial activity. Based on the solubility test results, lemongrass oil was the best solubilizing oil for drugs, while Tween 80 and Span 80 demonstrated the highest solubilizing ability for drugs among the surfactants. The optimum self-nano-emulsifying formulation had particle sizes of less than 200 nm and a PDI of close to zero. The results showed that incorporating the SNEDDS formulation of the drug with Carbopol at various concentrations did not cause a significant change in the particle size and PDI of the drug. The zeta potential results for drug nanoemulgel were negative, with more than 30 mV. All nanoemulgel formulations exhibited pseudo-plastic behavior, with 0.4% Carbopol exhibiting the highest release pattern. The drug nanoemulgel formulation worked better against bacteria and acne than the product on the market. Nanoemulgel is a promising way to deliver BPO because it makes the drug more stable and increases its ability to kill bacteria.

Formulation of eucalyptus oil-zinc sulfide hybrid nanoemulsion and evaluation of its larvicidal potential against Aedes aegypti

The growing threat of vector- borne diseases and environmental pollution has prompted the nanotechnology based investigations. The present study aimed to use one of the nanotechnological applications with larvicidal potential against Aedes aegypti by preparing aqueous hybrid nanoemulsion of zinc sulfide nanoparticles and Eucalyptus globulus oil. The mean droplet size of prepared and most stable hybrid nanoemulsion (9.5 ppm) was found to be 60±10.00 nm with rectangular shape. The hybrid nanoemulsion exhibited LC50 and LC90 values of 7.63 and 9.22 ppm respectively against larval stages of Aedes aegypti. The findings obtained from the larvicidal assay were corroborated with SEM, histological and biochemical profiles of Aedes larvae after treating with hybrid nanoemulsion. Under simulated conditions, nanohybrid treatment demonstrated optimum larvicidal potency after 48 hrs of exposure. Further, biosaftey studies of hybrid nanoemulsion were carried out against Scapholebris kingi and this larvicidal concentration of nanohybrid was found to be non-toxic to this species. Thus, the following research explains the larvicidal efficacy of zinc sulfide based hybrid nanoemulsion of eucalyptus oil formulated during the present study is a step towards safe and efficient approach against dengue spreading vector mosquito, Aedes aegypti.

Gingerol and Shogaol Nanoemulsion of Ginger Extract-based Subcritical Water Extraction

The aim of the present study was determine optimum processing conditions and nanoemulsion formulation for the preparation of gingerol and shogaol nanoemulsion from ginger extract-based subcritical water. For this purpose, nanoemulsions were prepared with rotor-stator homogenizer and varied surfactant and cosurfactant concentrations (24%, 26% and 28% v/v), and stirring speed (22,000 rpm, 24,000 rpm). The stirring time is adjusted to 30 minutes. The density, viscosity, pH, % transmittance, nanoemulsion type test, centrifugation test, particle size, zeta potential, and polydispersion index was observed. Nanoemulsion with 28% emulsifier has a % transmittance value closest to 100% indicating that the particle size is estimated at nanometers. The results of test showed that the formed ginger extract nanoemulsion was unstable. Therefore, further studies are needed to find the optimum process conditions and nanoemulsion formulations to form stable

Formulation and characterization of nanoemulsions stabilized by nonionic surfactant and their application in enhanced oil recovery

Nanoemulsions are kinetically stable emulsions with droplet size distribution in the range of 10–500 nm. Low interfacial tension (IFT), small droplet size, and wettability alteration properties of nanoemulsions have led to their application for enhanced oil recovery (EOR) EOR. The current study deals with the formulation and characterization of Tergitol 15-S-9 surfactant stabilized oil/water nanoemulsion (NE). Optimal surfactant concentration accompanied by optimal salinity determination was done by observing long-term stability. The stability of the nanoemulsions was analyzed by Turbiscan and Zeta potential analysis. The optimal nanoemulsion was characterized in terms of droplet size, rheology, wettability, miscibility, and IFT. All the prepared nanoemulsion showed particle size < 300 nm. optimized nano emulsion, that is, 0.5 wt.% surfactant +0.5 wt.% salinity showed good IFT reduction and wettability alteration capability. Nanoemulsion also showed good miscibility behavior with actual crude oil at 60 °C. Rheology of the formed emulsion shows a mixed nature that is shear thinning as well as shear thickening nature which is favorable for heterogeneous reservoirs. Core-flooding experiments were conducted at optimized nanoemulsion formulation, and additional oil recovery of 13.93% of the original oil in place was obtained after the conventional water flooding. Highlights Experimental and mechanistic investigation of nanoemulsions for oil recovery. Enhanced miscibility of Tergitol 15-S-9 stabilized nanoemulsion with crude oil. Viscosity enhancement by macromolecular and supramolecular network structures. Low IFT achieved for the nanoemulsion resulting enhanced oil displacement. Encouraging oil displacement by injection of formulated nanoemulsion.