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 Table of Contents  
Year : 2020  |  Volume : 12  |  Issue : 3  |  Page : 308-316  

Date seed extract-loaded oil-in-water nanoemulsion: Development, characterization, and antioxidant activity as a delivery model for rheumatoid arthritis

1 Department of Pharmaceutics, Faculty of Pharmacy, Integral University, Lucknow, Uttar Pradesh, India; †Present address: Department of Pharmaceutics, School of Pharmaceutical Education & Research Jamia Hamdard, New Delhi, India
2 Department of Pharmaceutics, School of Pharmaceutical Education & Research Jamia Hamdard, New Delhi, India
3 Department of Pharmaceutics, Faculty of Pharmacy, Integral University, Lucknow, Uttar Pradesh, India
4 Department of Pharmacognosy and Phytochemistry, School of Pharmaceutical Education & Research Jamia Hamdard, New Delhi, India
5 Department of Pharmaceutics and Industrial Pharmacy, College of Pharmacy, Taif University, Taif-Al-Haweiah, Saudi Arabia
6 Department of Pharmacognosy, College of Pharmacy, Taif University, Taif-Al-Haweiah, Saudi Arabia

Date of Submission14-Apr-2020
Date of Decision29-Apr-2020
Date of Acceptance03-May-2020
Date of Web Publication20-Jul-2020

Correspondence Address:
Dr. Juber Akhtar
Department of Pharmaceutics, Faculty of Pharmacy, Integral University, Dasauli Kursi Road, Lucknow 226026, Uttar Pradesh
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/jpbs.JPBS_268_20

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Rheumatoid arthritis is an inflammatory disorder, affecting around 1% of the world population. Antioxidant activity plays important role to overcome the inflammation associated with arthritis. Phoenix dactylifera (date) seeds, generally considered as a waste product or utilized as food for domestic farm animals, have been used as a source of antioxidants at different disease conditions. The aim of the present study was to enhance the release of date seed extract in order to achieve high antioxidant activity. Nanoemulsion of methanolic extract of date seed was prepared by aqueous titration method. The selected formulations were exposed to thermodynamic stability and dispersibility tests. The optimized nanoemulsions were evaluated on the basis of droplet size (23.14 ± 0.055nm), polydispersity index (0.166 ± 0.124), percent transmittance (99.12 ± 0.0163), refractive index (1.36 ± 0.046), viscosity (cP) (12.30 ± 0.75), conductivity (µS/cm) (347.46 ± 1.10), and drug content (%) (99.67 ± 0.11). The in vitro release studies revealed that final optimized formulation has cumulative release of drug (57.51% ± 2.65%), which was more significantly greater as compared to drug suspension (26.44% ± 1.15%). Further in vitro antioxidant activity studies revealed that the developed methanolic extract of date seed-loaded nanoemulsion has more antioxidant potential when compared with methanolic extract.

Keywords: Antioxidant, nanoemulsion, Phoenix dactylifera, rheumatoid arthritis

How to cite this article:
Qadir A, Aqil M, Ahmad U, Khan N, Warsi MH, Akhtar J, Arif M, Ali A, Singh SP. Date seed extract-loaded oil-in-water nanoemulsion: Development, characterization, and antioxidant activity as a delivery model for rheumatoid arthritis. J Pharm Bioall Sci 2020;12:308-16

How to cite this URL:
Qadir A, Aqil M, Ahmad U, Khan N, Warsi MH, Akhtar J, Arif M, Ali A, Singh SP. Date seed extract-loaded oil-in-water nanoemulsion: Development, characterization, and antioxidant activity as a delivery model for rheumatoid arthritis. J Pharm Bioall Sci [serial online] 2020 [cited 2020 Oct 25];12:308-16. Available from:

   Introduction Top

Rheumatoid arthritis (RA) is a most common inflammatory disorder. It is portrayed at the cell level by changes in the natural and adaptive immunity, which creates a constant synovial joint provocative reaction that may influence other organs.[1] Studies in support of RA have given the proof that RA is a dynamic insusceptible cell-intervened illness, which is started and advanced by variant actuation of T cells with related B-cell hyperactivity. The deregulation of invulnerable cell action causes incessant synovial joint inflammation that is considered fundamentally by T-cell-interceded actuation of synovial fibroblasts.[2] This drives the dynamic obliteration of cartilage and subchondral bone bringing about joint disaster.[3] Free radicals are involved in constant incendiary illnesses including RA and some other conditions. Free radicals assume a significant job in the seriousness of rheumatoid joint pain and patients, for the most part, endure with excessive oxidative stress. Antioxidants either engineered or natural are intense foragers of free radicals and effectively affect human well-being and illness avoidance.[4] It has been reported that antioxidants have plausible role for uplifting the inflammatory condition in RA patients.[5] Several literature reported that synthetic antioxidants (butylated hydroxyanisole, butylated hydroxytoluene) may be the cause of cancer development. So, natural antioxidants are extremely desirable.[6]

Phoenix dactylifera (date palm) belongs to the family Palmaceae and genus Phoenix, cultivated globally, especially in Middle East and North Africa for its palatable organic nature. A date is a high-vitality nourishment having high value of carbohydrates (70%–80%) and low fat content, and is a great wellspring of phenolic compounds, vitamins, carotenoids, zinc, iron, calcium, magnesium, phosphorous, and potassium. Date seeds are generally considered as a waste item and either disposed of or utilized in as animal feed. Nevertheless, date seeds have been appeared to have highly extractable valuable components.[7] The preventive effects of natural antioxidants in leafy foods are associated with four significant groups of compounds such as polyphenols, alkaloids, vitamins, and carotenoids.

Edible portion of date and date seed has antioxidant activity in vitro because of the existence of phenolic compounds.[8] Defensive effect of phenolic compounds as antioxidants is related to lipoperoxidative impairment, which relies on the hydrogen donating limit of hydroxyl bunch in every molecule.[9]

The nanotechnology-based drug delivery system such as nanomicelles, nanoemulsions, nanosuspension, nanoparticles, and some other nanoformulations has displayed a promising value in enhancing the delivery of hydrophobic and hydrophilic molecules since past decades.[10] Nanoemulsion provides very low interfacial tension with substantial oil-in-water interfacial regions, high dynamic strength, and optical transparency approximating to microemulsion.[11],[12] Nanoemulsions offer a higher solubilization limit than a straightforward micelle arrangement and their thermodynamic steadiness offers favorable circumstances over flimsy scatterings, for example, emulsion and suspension.[13] Nanoemulsions may also be employed as an alternate for lipidic nanocarriers (liposomes and vesicles) to enhance bioavailability of many active biomolecules when compared with the traditional formulations.[14] Thus, to improve the antioxidant activity of date seed, a robust and stable nanoemulsion system containing date seed extract was developed and optimized. The developed nanoemulsions were further evaluated for mean droplet size and its surface morphology, viscosity, conductivity, refractive index (RI), in vitro drug release, and in vitro antioxidant activity.

   Materials and Methods Top

Materials and chemicals

Date seeds were purchased from local in a full ripe condition and authenticated by Dr. Y. T. Kamal, Assistant Professor, Department of Pharmacognosy and Phytochemistry, College of Pharmacy, Sattam Bin Abdul Aziz University, KSA (accession no. PSA/PHAR/COG/15/04). Sefsol 218 and Kolliphor RH40 were acquired as a bequest from Nikko Chemicals (Tokyo, Japan) and BASF (Mumbai, India), respectively. PEG 400 was procured from S.D. Fine-Chem (India). All chemicals used were of analytical grade like Isopropyl myristate (IPM), Olive oil,Methanol (HPLC grade) were purchased from Merck (Mumbai).


Methanolic extract of date seeds

Date seeds (200g) were extracted with 500 mL of methanol using Soxhlet apparatus for 24 h at 50°C–60°C. After extraction, the solvent was evaporated to dryness using a rotary vacuum evaporator (HAHN SHIN, HS-2005 V-N) at 40°C under an inert atmosphere to obtain a dark brown-colored residue. This obtained material was weighed and percentage yield was calculated.[15]

Nanoformulation development and its characterization

To achieve stable and robust nanoemulsion, a through screening of various components was done. For this, solubility studies of methanolic extract of date seed were performed with different oils, surfactants, and cosurfactants. Afterward, construction of pseudoternary phase diagram was carried out followed by testing of their thermodynamic stability of developed nanoemulsions.

Screening of oil, surfactants, and cosurfactants by solubility studies

An important criterion for a stable nanoemulsion is to find out the solubility of a drug in selected oils. In this sequence, solubility of date seed extract was analyzed in different oils (Sefsol 218, Capryol 90, oleic acid, and isopropyl myristate [IPM]). An excess quantity of date seed extract was poured in stoppered vials containing 2 mL of each oil and blended utilizing a vortex.[13] To get equilibrium, these vials were further kept at 25°C ± 1.0°C in an isothermal shaker (IKA KS 400i, Germany) for 72 h. Afterward, these vials were centrifuged (REMICM are -8 Plus and CM-12 Plus, India) at 10,000rpm for 15 min. The supernatant obtained was filtered over a 0.45-µm membrane filter and the quantity of date seed extract was further estimated in various oils by a UV spectrophotometer (UV-1800, Schimadzu) at a wavelength of 280nm. A qualitative solubility test was performed for selecting a surfactant and cosurfactant. Final selection was done based on the miscibility of extract loaded oil with surfactants.

Preparation of nanoemulsion

Nanoemulsions were formulated by aqueous titration method followed by construction of pseudoternary phase diagrams to determine the concentration range of oil, Smix (surfactant–cosurfactant mixture), and distilled water.[13] Different Smix ratios were prepared by mixing surfactants and cosurfactants in different quantities (1:0, 1:1, 1:2, 2:1), one or the other in increasing concentration with respect to each other. For every phase diagram, oil and a definite Smix ratio were blended properly in distinct volume ratios from 1:9 to 8:1 in individual glass vials. Then the blend (1:9, 2:8, 3:7, 4:6, 5:5, 6:4, 7:3, 8:2, 9:1, 1:2, 1:3, 1:3.5, 1:5, 1:6, 1:7, and 1:8) was titrated slowly with aqueous phase. Each titration was visually examined for transparency and flowability. The physical condition of the nanoemulsion was set apart on the phase diagrams with three pivots demonstrating an aqueous phage, oil, and Smix. For each stage graph, nanoemulsion territory was drawn and the more extensive district showed the improved self-nanoemulsifying proficiency. From every phase diagram, constructed, various formulations were selected from nanoemulsion region altering the proportion of oil (10-30%v/v) at minimum concentration of Smix. Furthermore, the selected nanoemulsions were studied for stability and dispersibility.

Thermodynamic stress stability studies

Designated nanoemulsions were analyzed for the stress stability tests (heating–cooling cycle, centrifugation, and freeze–thaw cycle):

Heating–cooling cycle: Formulations were exposed to 45°C and 0°C for 48 h for each temperature round and examined for any type of precipitation or phase separation.

Centrifugation study: Selected nanoemulsions were further centrifuged at 5000rpm (REMI) for 30 min and diagnosed for any possible non-homogeneity of formulations.

Freeze–thaw cycle: In this study, nanoemulsions were maintained at the temperatures −20°C and +20°C for three cycles and each cycle for 24 h and these formulations were observed for homogeneity.[16]

Dispersibility tests

Every selected formulation (1 mL) was gently added to a medium of 0.1N HCl (500 mL) in an USP Type II dissolution apparatus (75rpm) at 37°C ± 0.5°C, in order to evaluate its proficiency of self-emulsification.[17] All formulations were observed visually as per the grading system given in [Table 1].
Table 1: Dispersibility test

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Formulations that agreed with the stability and dispersibility criteria were selected for preparation of date seed extract-loaded nanoemulsion followed by further characterization.

Preparation of drug-loaded nanoemulsion by aqueous titration method

The drug-loaded nanoemulsion (DLN) was fabricated by dissolving 50 mg (single dose)[8] of methanolic date seed extract in oil (5%, 10%, 15%, 20% vol/vol). Respective Smix ratio was mixed with oil using vortex followed by gently adding aqueous phase to achieve nanoemulsion.

Physicochemical characterization and evaluation of nanoformulation

Visual inspection

Visual inspection was performed to distinguish the drug-loaded nanoemulsion and macroemulsion.

Droplet size measurement

The average droplet size of nanoemulsions was established by dynamic light scattering method with the help of zetasizer ZS 90 (Malvern Instruments, Worcestershire, UK). Scattering of light was done at the room temperature at a 90° angle. Polydispersity index (PDI) of the formulations was also recorded.[16]

Viscosity measurement

Viscosity of the developed nanoemulsions was also determined by a Brookfield DV III ultra V6.0 RV cone and plate rheometer (Brookfield Engineering Laboratories, Middleboro, Massachusetts) with spindle #CPE40 at 25°C ± 0.5°C.

Electro conductivity studies

To find the type of developed nanoemulsions, conductivity (σ) studies were performed using a CDM 230 conductometer (Radiometer, Copenhagen, Denmark) with the cell constant value of 0.11/cm and the frequency of 94 Hz at 25°C ± 1°C.

Refractive index and percent transmittance

RI of the developed nanoemulsions was measured by placing a single drop of nanoemulsion on the slide and analyzed using an Abbe refractometer (Bausch and Lomb Optical Company, Rochester, New York) at 25°C. In order to get % transmittance, the sample was examined using a UV spectrophotometer (Shimadzu, Japan) at 280nm with respect to distilled water.[18]

Surface morphology

Surface morphology of the developed formulation was explored by transmission electron microscopy (TEM; TOPCON 002B, Topcon).[13] One drop of the selected formulation was taken and attenuated with distilled water (1:100); after filtering with a syringe filter (0.22 μm), the sample was placed on the carbon grid with 2% phosphotungstic acid and allowed to stay for 30s. This dried grid was placed on a slide and covered up with a cover slip. The prepared slide was analyzed using the microscope.

Drug content

There is a possibility of precipitation of active drug due to the presence of surfactant and cosurfactant in the formulation by the centrifugation method. Hence, the amount of drug in the developed formulations was calculated by using UV spectroscopy. The selected formulations were diluted with methanol and the absorbance was recorded at 280nm. Drug content was expressed as a percentage of date seed extract determined in the formulation to the theoretical quantity of the drug added.

In vitro drug release profile

The optimized nanoformulations were further investigated for the drug release profile by the dialysis bag method. Dialysis membrane was preactivated in a solvent system of phosphate buffer (pH 7.4) and methanol (3:1) for 1 h . One milliliter of date seed extract-loaded nanoemulsion and suspension was placed into a separate preactivated dialysis bag (MW: 12,000–14,000Da). Both the ends of dialysis bag were tied properly and suspended in a baker filled with solvent system (20 mL). The whole set up was affirmed at 37°C ± 1°C with continuous stirring at 75rpm for 24 h. At predetermined time intervals (0, 0.5, 1, 2, 4, 6, 8, 10, 12, and 24 h), drug samples (1 mL) were withdrawn and filtered over a 0.22-μm membrane filter. Withdrawn quantity of medium was replaced with an equal volume of fresh medium to achieve the sink condition. The analysis was done in triplicate. The withdrawn samples were analyzed by a UV spectrophotometer (UV-1800, Shimadzu) at 280nm for the drug content. The release profile of the nanoemulsions were compared with the drug suspension.[19]

Antioxidant activity

The radical scavenging potential of methanolic extract of date seed in contrary to 1,1-diphenyl-2-picrylhydrazyl (DPPH) was determined by analytical techniques UV spectrophotometry, at 517nm. An aliquot (20, 40, 60, 80, 100, and 120 μg/mL) for methanolic extract of date seed was dissolved in different test tubes comprising 5 mL of methanol and 0.5 mL of 1mM DPPH. α-Tocopherol (vitamin E) was used as the standard with the identical concentrations as that of test samples. A placebo solution with equal volume of methanol and DPPH was made, and this solution mixture was incubated at room temperature for half an hour.[20] The antioxidant activity was estimated using the following equation:

where Ab denotes absorbance of blank and As denotes absorbance of sample.

All experiments were done in triplicate. The calculated IC50 values are stated as mean ± SD.

   Result and Discussion Top

Extraction of components from date seed

Methanol was used as a solvent for extraction of components using Soxhlet apparatus for 24 h. After 24 h, the solvent was evaporated under reduced pressure to obtain chocolate-colored solid mass and the percent yield was calculated to be 12% wt/wt [Figure 1].
Figure 1: Methanolic extract of crown

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Solubility studies

Solubility examinations were carried out to identify an appropriate oil phase for the effective formulation of date seed extract-loaded nanoemulsion to attain the drug in the solubilized form with optimal drug loading. In the selected oils, the solubility of the date seed extract was observed maximum in Sefsol 218 (70 mg/mL) followed by IPM (32.48 mg/mL), triacetin (18.5 mg/mL), and oleic acid (20 mg/mL) [Figure 2]. Therefore, Sefsol 218 was chosen as oil phase for the formulation development. It has been reported that nanoemulsion comprising Sefsol 218 as oily phase provides a broader and stable nanoemulsion region when combined with a surfactant, Kolliphor RH40, and cosurfactant, PEG400.[21] Therefore, after performing a miscibility test of Sefsol 218-solubilized extract with Kolliphor RH40 and PEG400, it was observed that the selected surfactant and cosurfactant were completely miscible to each other.
Figure 2: Quantitative solubility studies of date seed extract in different oils

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Ternary phase diagram study

Ternary diagram is utilized to ascertain the presence of different zones of nanoemulsion. It graphically delineates the proportions of the three factors as positions in a symmetrical triangle. Typically, three distinct types of phages are observed during construction of a ternary phage diagram that is nanoemulsion state (transparent bluish nature), coarse emulsion (unstable, milky white) and liquid crystal (translucent gel like state). However, in this study, our interest was only in the nanoemulsion region and therefore only those points have been marked, which clearly showed the formation of nanoemulsion [Figure 3].
Figure 3: Ternary phase diagrams of date seed extract nanoemulsions, F1 (Smix 1:0), F2 (Smix 1:1), F3 (Smix 2:1), and F4 (Smix 1:2)

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In this study, four different triangles were observed for the nanoemulsion region. F1 formulation contains Sefsol 218 as oil phase and kolliphor RH40 as surfactant, and no cosurfactant was used in this case. It was found from the diagram that low quantity of oil might be solubilized with a higher concentration of surfactant. It generated a constricted range for nanoemulsion formation. Addition of a cosurfactant helps in improving the nanoemulsion region. An amphiphilic short-chain molecule is used for lowering the surface tension. Cosurfactants enter inside the surfactant monolayer, giving extra fluidity to the interfacial film and hence disturbing the liquid crystalline stages which are established when the surfactant film is excessively inflexible. This could be ascribed to the way that transient negative interfacial tension and liquid interfacial film are once in a while accomplished by the utilization of single surfactant, generally requiring the addition of a cosurfactant. The ternary plot of F2 formulation, which was composed of Sefsol 218 (oil phase), kolliphor RH40 (surfactant), and PEG 400 (cosurfactant) with an Smix ratio of 1:1, demonstrated the development of a wider region of nanoemulsion. Transparent nanoemulsions with light bluish shade with the maximum solubilization of oil were achieved in this region. The formation of maximum nanoemulsions in this region may be accredited to lower interfacial tension among oil and water phases, because maximum volumes of oil were solubilized with surfactant in this region. Furthermore, surfactant and cosurfactant blending in optimized amount causes massive oil phase solubilization. The availability of PEG 400 as cosurfactant diminishes the bending strain of interface and creates the interfacial film adequately adaptable to use up various arches obligatory to develop nanoemulsion over a wide scope of compositions. Observations from the ternary plot of F3 phase diagram showed higher nanoemulsion formation in the higher surfactant area; however, this section was relatively lower when compared with F2 diagram. Hence, lesser quantity of water was able to solubilize in this region; the nanoemulsion area was limited to boundaries adjacent to the surfactant area. This might be because of enhanced quantity of kolliphor RH40 in the formulation. Phase diagram achieved from F4 formulation (Smix ratio: 1:2) demonstrates the development of nanoemulsions in the watery-rich locale. It might be due to an enhanced amount of PEG 400 which causes a much reduced interfacial tension when compared with other systems.

Thermodynamic stability tests

All the developed nanoemulsions were evaluated for thermodynamic stability. Stable formulations were selected for preparation of drug-loaded nanoemulsion followed by further characterization. Stability test findings are reported in [Table 2].
Table 2: Thermodynamic stability test of different formulation selected from phase diagrams

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Preparation of drug-loaded nanoemulsion

Formulations that cleared all the stability tests and contained minimum amount of surfactant were selected for drug incorporation. Since it is assumed that a dose of drug is easily soluble in one mL of oil, therefore, drug was loaded in various oil concentrations which passed stability tests [Table 3].
Table 3: Optimized formulation selected from phase diagram and thermodynamic stability study test at a difference of 3% vol/vol of oil

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Physicochemical characterization of nanoemulsions

Visual appearance

Physical observations were made for the developed formulations; clear and transparent nanoemulsions were found without any turbidity [Figure 4].
Figure 4: Comparison of a (A) nanoemulsion (clear) and (B) macroemulsion (turbid) prepared by aqueous titration method

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Droplet size measurement and morphology

Droplet size and size distribution were analyzed as shown in [Figure 5] and [Figure 6]. It was observed that all the formulations were in the nano size range with a low PDI value. The formulation F11 exhibited the lowest droplet size (23.14 ± 0.055nm) with PDI, 0.166 ± 0.124 [Table 4]. The lower PDI value reflects the uniformity of nanoemulsions. The TEM image revealed that drug-loaded nanoemulsions were spherical in shape with the agreement of droplet size as noted by a zetasizer. Therefore, the outcomes were indicative of the fact that proper selection of oil, surfactant, and cosurfactant with definite concentrations are the crucial factors for achieving smaller droplets size with a stable nanoemulsion as shown in [Figure 7].
Figure 5: Droplet size distribution of optimized nanoemulsion

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Figure 6: Zeta potential of optimized nanoemulsion

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Table 4: Mean (±SD, n = 3) droplet size, polydispersity index, percent transmittance, refractive index, viscosity, conductivity, and drug content

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Figure 7: Transmission electron microscopy image of optimized nanoemulsion

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Drug content

Drug content (date seed extract) in the optimized nanoemulsions was evaluated spectrophotometrically, which was in the range of 98.11%–99.61%. The drug content differed up to 1.0% between different formulations [Table 4].

In vitro drug release

Release studies of optimized formulations (F3, F6, F8, and F11) and conventional suspension of date seed extract were performed, and data revealed that release of drug from optimized formulations is tremendously significant (P < 0.001) than release of drug from conventional suspension as depicted in [Figure 8]. Drugs released from the nanoemulsions were significantly higher as compared to that from drug suspension due to its nano-sized droplets, which offers a high surface area for solubilization, subsequently boosting solubility as well as dissolution rate. Comparative drug release data showed that the formulations F3, F6, F8, and F11 and drug suspension released 36.46% ± 1.82%, 39.43% ± 2.14%, 41.54% ± 1.78%, 57.51% ± 2.65%, and 26.44% ± 1.15% of cumulative drugs, respectively, at 24 h. It is probably due to the larger droplet size and viscosity of F3, F6, and F8, which could limit the drug release. On the basis of release studies, F11 formulation was selected for antioxidant activity.
Figure 8: In vitro release profile of date seed extract from different optimized nanoemulsion formulations (F3, F6, F8, and F11), and pure drug suspension (standard) in phosphate buffer, pH 5.6

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Antioxidant activity

Antioxidant potential of date seed extract was determined by the DPPH assay in which the utilization of a stable free radical (DPPH) was assessed. Antioxidant activity was assessed based on the principle that when mixing the DPPH solution (used as an indicator) with an antioxidant, it donates hydrogen atom, which contributes to the reduced form “diphenylpicrylhydrazine” (non-radical). The color of the reaction mixture changed from purple to yellow and its absorbance was measured at a wavelength of 517nm. The standard α-tocopherol compound was taken to compare the antioxidant activity of methanolic extracts of date seed. The IC50 for DPPH scavenging action was determined graphically [Figure 9]. Methanolic extract of date seed and nanoemulsion formulation at the concentration of 120 μg/mL showed 83.6% and 75.1% activity comparable to positive control (α-tocopherol; 98.1%). It was observed that antioxidant activity of date seed extract was directly proportional to the concentration of extracts. A lower IC50 value indicates higher antioxidant activity. The antioxidant activity of date seed is ascribed to the presence of phenolic compounds and terpenes. The phytoconstituents existing in the extracts were verified by GC-MS, and it was found that extracts were rich in antioxidant principles, which are responsible for anti-inflammatory and anti-arthritics activity.[15]
Figure 9: Dose-dependent scavenging of 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals by the methanolic extract of date seed and compared with standard drug α-tocopherol. Each value represents mean ± SD (n = 3). IC50 values of methanolic extract of date seed, nanoemulsion formulation, and α-tocopherol were 83.6 ± 1.78, 75.1 ± 1.09, and 98.1 ± 1.14 µg/mL, respectively

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   Conclusion Top

In this research work, nanoemulsion containing date seed extract was successfully developed by utilizing Sefsol 218 as oil phase, kolliphor RH40 as surfactant, and PEG 400 as cosurfactant and further characterized for in vitro performance. The developed nanoemulsions were in nanometric size with a high drug content range (98.11%–99.61%) and were also thermodynamically stable. The in vitro release study showed significantly enhanced drug release when compared with drug suspension. Results from antioxidant activity indicate that optimized nanoemulsion has more antioxidant potential when compared with drug suspension. On the basis of our research findings, it could be concluded that the developed methanolic extract of date seed nanoemulsion was found to have more antioxidant potential and high drug release when compared with conventional suspension. The enhanced detailing could be a substitute for the treatment of RA. However, there is a need for further studies in terms of preclinical data to make it clinically reasonable.

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Conflicts of interest

There are no conflicts of interest.

   References Top

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  [Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5], [Figure 6], [Figure 7], [Figure 8], [Figure 9]

  [Table 1], [Table 2], [Table 3], [Table 4]


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