Journal of Nanomaterials

Journal of Nanomaterials / 2020 / Article
Special Issue

Advanced Nano/Micro Materials for Drug Delivery Applications

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Research Article | Open Access

Volume 2020 |Article ID 2985721 |

Mai Thi-Hoang Nguyen, Khanh Loan Ly, Thoai Quoc Kieu, Hiep Thi Nguyen, Nam Cong-Nhat Huynh, "Gelatin Encapsulated Curcumin Nanoparticles Moderate Behavior of Human Primary Gingival Fibroblasts In Vitro", Journal of Nanomaterials, vol. 2020, Article ID 2985721, 11 pages, 2020.

Gelatin Encapsulated Curcumin Nanoparticles Moderate Behavior of Human Primary Gingival Fibroblasts In Vitro

Guest Editor: Anuj Kumar
Received12 Mar 2020
Revised08 May 2020
Accepted26 May 2020
Published09 Jul 2020


Objective. Currently, there is no study evaluating the effect of nano-curcumin on human oral cells in vitro. In this study, we developed gelatin encapsulated curcumin nanoparticles (GelCur) and cultured the primary human gingival fibroblasts (hGFs) to verify the effect of GelCur on the cellular events related to oral wound healing capacities, such as cell migration and proliferation of gingival fibroblasts. Materials and Methods. GelCur was produced by the sonoprecipitation method. Particle size, zeta potential, SEM morphological observation, entrapment efficiency, and drug loading were used to characterize new GelCur. Primary hGFs were cultured from the attached gingival tissue of healthy third molar teeth. The effect of different concentrations of GelCur on hGFs was investigated by cell toxicity assay (MTT), cell proliferation assay, and cell migration assays by scratch test and transwell migration assay. Results. The average particle size of GelCur was around 356 nm with a moderate zeta potential of 26.5 mV. The mean PdI value of GelCur was 0.2, while the entrapment efficiency and drug loading of curcumin in this study were around 57% and 2.4%, respectively. IC30 of GelCur on hGFs was 3.96 mg/ml, while IC50 was 12,37 mg/ml. More than 70% of cells were viable after 24 hours incubated with 1, 2, and 3 mg/ml GelCur. At the concentration of 2 mg/ml GelCur virtually limited cell proliferation and migration. Conclusions. GelCur remained physically stable and did not alter cell proliferation and migration. The concentration of GelCur <3.96 mg/ml did not cause hGF cytotoxicity. Our study showed that within appropriate doses, GelCur can be used safely for hGFs.

1. Introduction

With the current situation of drug resistance and abuse, natural medicines have been considered for patients. Turmeric (Curcuma longa), the major source of the curcumin (diferuloylmethane), has long been recognized for its beneficial pharmacological properties and is still being widely practiced as a noninvasive wound therapy in many cultures [1]. Traditionally, curcumin has been a popular remedy for the treatment of anti-inflammation, accelerate wound healing, and minimal scar formation. The wound healing potential of curcumin, which correlated to its biochemical effects such as anti-inflammatory, anti-infectious, and antioxidant activities, has been investigated over recent years, leading to a remarkable increase of clinical trials and publications [13]. Furthermore, many curcumin-based wound dressings have been developed such as PVA/Chitosan/Curcumin, PVA/SA/TiO2-CUR, or sodium alginate/PVA incorporated curcumin patch for its anti-inflammatory, antioxidant, and antibacterial properties that aid in the wound healing process [46]. Despite the medicinal biological significances, the applications of these findings into clinical treatments have so far been impeded due to several physicochemical inherent limitations of curcumin, especially its poor absorption, hydrophobicity, instability, rapid metabolism, and elimination [1, 7]. To overcome these obstacles, various curcumin formulations, including emulsified micelles, nanofibers, nanocapsules, or hydrogel, have been developed.

A variety of curcumin-based systems have been produced to resolve those problems and enhance the applications of curcumin can be referred. For instance, Slika et al. have prepared curcumin-poly (allyl amine) hydrochloride-based nanocapsules to accelerate the encapsulation and release of curcumin to enhance its effectiveness against colon cancer [8]. Mouslmani and colleagues have developed a curcumin associated poly (allylamine hydrochloride)-phosphate self-assembled nanocapsules to control curcumin release and its antioxidant activity [9]. Venkatasubbu’s group has incorporated curcumin into chitosan/TiO2 nanoparticles to control its release for infectious wound management [10]. Especially, the development of nanobiotechnology allows for the encapsulation of curcumin in drug delivery systems such as gelatin nanoparticles has emerged as a remedial approach [11]. Gelatin nanoparticles have been recognized as potential candidates for medical applications by owning biodegradable, biocompatible, and nontoxicity properties. Moreover, the encapsulation of drug in gelatin nanoparticles enhance drug stability and control drug release effectively [12].

Oral fibroblast, including gingival fibroblast, plays important role in oral tissue homeostatic maintenance, wound healing, and tissue repair by synthesizing and secreting various extracellular matrix (ECM) proteins, containing collagen, fibronectin, and proteoglycans [13]. To investigate the natural remedies, which are safe, effective to accelerate oral wound healing and reduce the treatment costs is necessary. However, there is no study to investigate the effect of nano-curcumin in oral cells regarding cell toxicity, proliferation, and migration. Ngo and colleagues have previously developed and characterized gelatin encapsulated curcumin nanoparticles (GelCur) to implement in transdermal drug delivery study [11]. Following up on those insights, in this study, we synthesized GelCur based on established work and cultured the primary human gingival fibroblasts to verify the effect of GelCur on the cellular events related to oral wound healing capacities, such as cell migration and proliferation of gingival fibroblasts.

2. Materials and Methods

2.1. Fabrication of Gelatin Encapsulated Curcumin

Curcumin powders were supplied by Shanghai Zhanyun Chemical Co. Ltd. (China). Gelatin (bovine skin, type B) and poloxamer 407 (POX 407) were obtained from Sigma-Aldrich, Inc. (USA). The method of encapsulating curcumin using gelatin followed the sonoprecipitation method in the previous study [11]. Briefly, 20 mg curcumin and 250 mg poloxamer 407 (POX407) were dissolved in 5 ml methanol to form solvent phase suspension. 20 ml of gelatin solution 1 wt% was prepared by dissolving gelatin powder in distilled water and stirring at 400 rpm at 40°C for 1 hour. The prepared solvent phase suspension (Cur/POX407) was added dropwise into antisolvent phase (gelatin solution 1 wt%) while stirring at 750 rpm. The mixture was then sonicated for 20 minutes using probe sonication (QSONICA, USA) with an amplitude of 30%. The mixture was kept in an ice-cold water bath to maintain the temperature below 30°C. After sonication, the mixture was left stirring at 30°C for 2 hours for methanol to evaporate. In the subsequent step, the mixture was centrifuged at 1000 rpm for 30 minutes to remove the pellets, then the supernatant was collected and lyophilized at -50°C for 48 hours using Labconco Freeze Dryer (USA) to obtain GelCur powders (Figure 1(a)).

2.2. Characterization of Gelatin Encapsulated Curcumin
2.2.1. Particle Size and Zeta Potential

The particle size and zeta potential (parameter correlates with the surface charge of nanosuspension) of GelCur were analyzed using Zetasizer Nano Series (Malvern Instrument Limited, UK). 10 μl of GelCur suspension was diluted with 10 ml methanol as dispersing solution, followed by vortex shaking prior analysis. Measurements were performed in triplicate at 25°C.

2.2.2. Entrapment Efficiency and Drug Loading

The quantity of curcumin was determined using Ultimate 3000 HPLC (Thermo Fisher Scientific Inc., USA) followed previous studies’ settings [11]. 23.5 mg of GelCur powders (equivalent to 1 mg of curcumin corresponding to theoretical mass) was dispersed in 25 ml distilled water, followed by ultrasonicating at 50°C for 30 minutes. Then, absolute ethanol was added into the cooled down mixture and adjusted accurately to obtain 50 ml of the total solution. 100 μl of the solution was diluted with 900 μl methanol for HPLC analysis. The measurement was performed three times for each sample; the entrapment efficiency (EE) and drug loading (DL) were calculated using the given equations:

2.2.3. Morphological Observation

A scanning electron microscope (SEM, JSM-IT100, JEOL, Japan) was employed to observe the morphology of GelCur powders at 10 kV. Before SEM observation, the samples were coated with Au using the sputter-coater (Cressington Sputter Coater 108 auto).

2.3. Primary Human Gingival Fibroblast Culture

Ten third molars from seven 18 to 25-year-old healthy volunteers were extracted as recommended by their dentist. Tissues were obtained individually as previous studies [13, 14]. Immediately after extraction, the teeth were transferred to the lab in ice-cold storage medium Dulbecco’s Modified Eagle’s Medium/Ham’s Nutrient Mixture F12 (DMEM/F12) supplemented with 10% FBS, 500 UI/ml penicillin, 500 μg/ml streptomycin (Sigma, USA). The gingival tissues attached to the cervical area were carefully removed from the tooth and rinsed twice with PBS. The tissue was minced into mm pieces with a surgical blade and seeded in DMEM/F12 supplemented with 10% FBS, 1% antibiotics. The tissue samples were incubated separately at 37°C humidified atmosphere with 5% CO2, the medium was replaced every 3 days until outgrowing cells reached confluence. The primary hGFs at the 3rd–6th passage were used for the experiments. The patients provided written informed consent for the use of discarded tissues for research purposes. Tissue samples were de-identified and analyzed anonymously. The use of gingival tissues for research purposes was approved by the Ethics Committee of the University of Medicine and Pharmacy at Ho Chi Minh City (No. 277/DHYD-HDDD).

2.4. Cell Toxicity Assay

Cell toxicity assay was assessed by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide assay (MTT, USB Corporation, USA) [15, 16]. The cells were plated at 104 cells/well in 96-well plates. Cells were incubated with 1, 2, 3, 4, and 5 mg/ml GelCur with the approximate concentration of curcumin being 66, 132, 198, 264, and 330 μM, respectively (diluted in 10% FBS DMEM/F12 and serum-free DMEM/F12). DMSO 20% was used as the control based on the ability to induce cell death of DMSO from 20% as the previous studies [17, 18]. After 24 h, the medium was replaced with 100 μl MTT solution and incubated for 30 min at 37°C. The formazan product was dissolved in solubilization/stop solution. Using a microplate reader (EZ Read 400, Biochrom, UK), the optical densities were measured at 570 nm. The relative growth rate (RGR) as ISO 10993-5 was calculated by: , in which is the optical density of GelCur treated group and is the optical density of 10% FBS DMEM/F12 group. Cells were toxic when which is lower than 70% [19].

2.5. Cell Proliferation Assay

For proliferation assay, cells were plated at 103 cells/well in 96-well plate. From the result of toxicity assay, cells were treated with a proper dose of GelCur (diluted in 10% FBS DMEM/F12 and serum-free DMEM/F12) and control groups. After 1, 3, 5, 7, 9, 11 days, cell numbers were counted by trypan blue 0.4% as previously [16]. Briefly, 20 μl of cell suspension from each well was mixed with 20 μl trypan blue solution following by 3 minutes incubation at room temperature. The cells mixture was loaded into a hemocytometer and counted by a light microscope [16].

2.6. Scratch-Test Assay (“wound healing assay”)

Firstly, 105 cells/well were seeded in 6-well-plate. After cell starving, a sterile 100 μl pipette tip was used to make a straight scratch line on the monolayer of confluent cells at the bottom of the culture plate. The debris was washed away with PBS, and the cells were then cultured at 37°C, humidified 5% CO2. The cells were treated with GelCur at the concentration of 2 mg/ml by diluting in DMEM (with or without FBS). Culture medium contains 10% FBS was used as positive control, while the serum-free medium was used as the negative control. At time point 0 h and 24 h, the whole cell-free areas of each well were observed and recorded by an inverted microscope (CKX53, Olympus, Japan) and digital camera in the same position. The area of “wound healing” was analyzed using the Image-Analysis J 1.45S software as described previously [13].

2.7. Transwell Migration Assay

3D cell migration assay was performed in 24-well size transwell inserts with 8.0-μm-pore polycarbonate membrane and 0.3 cm2 effective growth area (BD Falcon™ Cell Culture Inserts, BD Biosciences, USA). cells in a total of 200 μl medium were seeded in each insert. To prevent cell proliferation, the migration assay was performed with serum-free medium in the presence or absence of GelCur for 16 hours. On the next day, nonmigrated cells from the upper surface of the membrane were carefully removed by a cotton swab. The cells that migrated to the other side of the membrane were fixed by formaldehyde 3,7% in PBS for 2 minutes following by 100% methanol. Then, cells were stained with Giemsa’s azur eosin methylene blue solution (Merck, Germany) and washed two times in PBS [20].

2.8. Data Analysis

All experiments were repeated with three different cell lines, each line was repeated three times. For statistical analysis, Kruskal-Wallis rank sum test and Dunn Kruskal-Wallis multiple comparisons posthoc test were used to compare between groups. We analyzed by package drc (dose-response curve), R version 3.6.1 with the level of significance being 0.05. values were adjusted with Bonferroni correction for multiple testing.

3. Results

3.1. Characteristics of GelCur

Following the production of GelCur, the analysis showed that the average particle size of GelCur was around 356 nm with a moderate zeta potential of 26.5 mV (Table 1), which remained physically stable and considered to be acceptable in this study. The PdI reveals the particle size distribution of nanosuspension, where the smaller range of particle size, the smaller PdI values and the contrary. The mean PdI value of GelCur was as small as 0.2 indicating that this GelCur nanosuspension possessed a uniform size distribution for monodisperse standards.


Particle size (nm)
Zeta potential (mV)
Entrapment efficiency (%)
Drug loading (%)

The entrapment efficiency measures the amount of curcumin that can be loaded into nanoparticles. The entrapment efficiency and drug loading of curcumin in this study were around 57% and 2.4%, respectively. The entrapment efficiency is determined by the concentration of drug carriers (gelatin), in which the higher the concentration of gelatin, the higher the viscosity of nanosuspension. The increase in viscosity could prevent diffusion between solution and antisolvent, where the larger particles containing higher curcumin content were fabricated. SEM was also employed to confirm the morphology of GelCur powders (Figure 1(b)). Further characterizations of GelCur including Fourier-transform infrared spectroscopy, X-ray diffraction, and Cur release profile can be found in the previous study [11].

3.2. Primary Culture of hGFs

At day 4-8, cells appeared from gingiva tissues by outgrowth culture method (Figure 2(a)). These cells started with different shapes (star, round, elongated shapes) and then gradually exhibited uniformed typical fibroblast-like morphology with a large oval nucleus and many cytoplasmic tails on day 10 (Figures 2(a) and 2(c)). The cells were healthy growing and reached confluent at day 20, even at passage 6th (Figure 2(b)).

3.3. GelCur Induces Cytotoxicity of hGFs in a Dose-Dependent Manner

To assess the cell viability, hGFs were treated with different concentrations of GelCur (1–5 mg/ml) for 24 hours, and cytotoxicity was measured by MTT assays. Results indicated that GelCur induced cytotoxicity in a dose-dependent manner (Figure 2(e)). The alteration of the shape and morphology of hGFs upon their incubation with GelCur was observed by an optical microscope (Figure 2(d)). Different concentrations of GelCur diluted in culture medium produced different shade of yellow colors. hGFs with normal morphology (spindle shape) were observed at the concentration 1, 2, and 3 mg/ml of GelCur, which are homologous with the negative control group. Meanwhile, treated with higher concentrations of GelCur (4 and 5 mg/ml), some hGFs with abnormal morphologies (shrinkage) are detected. More particularly, hGFs viability was decreased to 88.8%, 78.7%, 72.5%, 69.9%, and 68.1% for the concentrations of 1, 2, 3, 4, and 5 mg/ml, respectively. However, there was no significant difference within serum medium and GelCur groups by adjusted values. Only DMSO 20% gave to significant cytotoxicity on hGFs. From the % of cell viability, IC50 and IC30 of GelCur on hGF were calculated (12,37 mg/ml and 3,96 mg/ml, respectively). According to ISO 10993-5:2009 standard for in vitro cytotoxicity, a dose of GelCur >3.96 mg/ml which resulting in <70% viable cells after 24 hours will be cytotoxic to hGFs [19].

3.4. GelCur Inhibits hGFs Proliferation

Base on the results of the cell toxicity assay, the concentration of 2 mg/ml was used to evaluate the effects of nano-curcumin on the proliferation of hGFs. hGFs allowed to proliferate through serum-free and serum-supplemented DMEM were used as negative and positive controls. GelCur inhibited hGFs proliferation in a time-dependent manner (Figure 3(a)). The cell number of the positive control group significantly increased and reached a peak at day 7, while a reverse trend was observed in other groups. Data indicated that from day 5 to 11, cell proliferation was significantly (adjusted ) suppressed in both hGFs treated with GelCur in serum-free and serum medium in comparison with the positive control group. Additionally, on day 9, cell numbers in GelCur/serum medium groups were higher than GelCur/serum-free group. Generally, the proliferation of hGFs was substantially reduced after curcumin administration.

3.5. GelCur Do Not Influence the Migration of hGFs

To investigate the effect of nano-curcumin in hGFs migration during the oral wound-healing process, a scratch-test assay was conducted. After 24 hours, migrated cells toward the provisional gap were observed only in the serum medium group, which indicated the natural rate of cell migration (Figure 3(b)). The migrated hGFs were noted to be the lower in the presence of GelCur. However, the analysis showed no significant difference among groups (Figure 3(c)). Overall, although at the nontoxicity level, GelCur did not influence the migration of gingival fibroblasts.

3.6. GelCur Is Not a Chemoattractant Factor Moderating hGFs Motility

To clarify whether nano-curcumin plays a role as a chemoattractant factor stimulating fibroblast migration, a transwell migration assay was performed. hGFs were seeded in the upper chamber, while the bottom chamber contained 2 mg/ml GelCur diluted in serum-free DMEM or 10% FBS DMEM. hGFs were allowed to migrate through the membrane in the medium with or without FBS as positive and negative controls, respectively. GelCur treatments were found to reduce the number of migrated hGFs after 16 hours (Figure 3(d)). The significant reduction was noted in hGFs incubated with 2 mg/ml GelCur in both serum-free () and serum-supplemented DMEM () compared with positive control group () (Figure 3(e)).

4. Discussion

The therapeutic applications of curcumin have been limited due to its low solubility, short half-life, and poor bioavailability. To overcome those problems, a variety of curcumin formulations have been developed including emulsified micelles, nanoformulations, or incorporating in hydrogels, microgels, and nanofibers [2, 10]. Among the possible approaches, we chose gelatin, a natural protein obtained from the hydrolysis of collagen, which has been well-known for its biodegradability, biocompatibility, and nontoxicity as curcumin carrier (emulsifier). The use of gelatin as a curcumin carrier can increase curcumin solubility, stability as well as control its release. Most importantly, gelatin has been commonly used as an effective drug carrier owing to its diverse functional groups within its backbone, which offers many benefits for chemical modification and drug attachment, giving the site-specificity for efficient drug delivery [21, 22].

Particle size and surface charge (represented as zeta potential) are among the two important characteristics of nanocomposite. They determine the drug loading, drug release, stability, and bioactivity of nanocomposite as well as influence cell-drug interactions [23]. In particular, the surface charge of near ±30 mV suggests that the GelCur nanocomposite is stable and has a low risk of particle aggregate. In terms of particle size, the size of submicroscale of GelCur particles can enhance their surface interaction while not enable direct penetration through the cell membrane. Once GelCur particles attach to the surface, Cur can slowly be released, thus, lower the unexpected toxicity caused by high concentrations of Cur as reported previously [24]. Due to the smaller particle size than curcumin and improved drug permeation and drug release (85% after 24 h) [11], GelCur could overcome the low oral bioavailability of curcumin and increase the level and effectiveness of curcumin. On the side note, our GelCur nanosuspension produced the lyophilized-spherical particles that were slightly larger than in reported particle size results. The increase in particle size could be due to the pressure and stress emerged during lyophilization, which altered the interactions between particles and caused particle aggregation. Therefore, the use of lyophilization protectants should be considered in further research to prevent possible alteration of nanocomposite properties [25, 26].

Toxicity of nanomaterials is a common concern during developing a new topical wound healing agent, which is essential for clinical translation. Previous clinical trials shown that receiving high oral doses of curcumin (8 g/day) does not lead to cytotoxic concentrations due to the low oral bioavailability of curcumin [27]. However, a relatively high number of reports demonstrated that curcumin, at concentrations exerts a beneficial effect, can induce DNA damage and chromosomal alterations both in normal and malignant cells. Cao et al. reported 2.5-5 μg/ml of curcumin-induced nuclear DNA damage and apoptosis in human hepatoma G2 cells [28, 29]. Curcumin nanoparticles were developed to increases the levels of curcumin in tissues by enhancing particle penetration [27]. Aimee et al. shown that keratinocytes treated with 5 mg/ml nano-curcumin exhibited 81.7% cell viability as compared to untreated cells [30, 31]. Our results from our cell toxicity assay demonstrated that the survival of hGFs gradually decreased with the subsequent increase of GelCur concentration. Notably, a dose of GelCur >3.96 mg/ml will be cytotoxic to hGFs. Previous in vitro studies used direct curcumin leading to lower safe doses than our nano-curcumin [28, 29, 31]. Additionally, human gingival fibroblasts express a specific phenotype in extracellular matrix remodeling as mentioned [13, 32, 33]. The application of nano-curcumin and human oral fibroblasts in our study may contribute to the optimal implementation of drug delivery by nanoparticles in the oral environment. As in vitro studies do not thoroughly simulate the physiologic environment, further in vivo studies and clinical trials should be conducted for providing a complete insight into the potential toxicity of GelCur.

hGFs not only enable the maintenance of the barrier function of normal oral mucosal but also play a critical role in normal wound healing [34]. Upon wounding, cells proliferate and migrate into the wound area for synthesizing and depositing newly formed matrix components. To investigate the effect of GelCur on the cellular events of hGFs related to oral wound healing capacity, including proliferation and migration, the nontoxicity concentration of GelCur (2 mg/ml) was used. Our data showed that the proliferation of hGFs was substantially reduced after GelCur administration. The results may explain the ability of curcumin to control the wound healing process and prevent scar formation. Nanoformulated curcumin inhibited the growth and mobility of several types of cells both in vivo and in vitro in previous studies [35, 36]. Fibrotic progression, characterized by fibroblast proliferation and the deposition of collagens, has been effectively reduced when treated by curcumin [37]. Most of the recent studies demonstrated that the mechanism of inhibiting fibroblast proliferation by curcumin is related to blocking the TGF-β1 signaling cascade and upregulation of cathepsin K/L expressions [38]. Furthermore, curcumin upregulated the expression and activity of p53 which associated with the inhibition of proliferation and increases apoptosis in a variety of different cell lines [39, 40]. Our data from proliferation assay correlated well with data obtained from previous studies that curcumin exhibit an antifibrotic effect by the significantly inhibited proliferation of human fibroblast [38]. We found no evidence that GelCur influences the hGF migration, in congruence with past investigations using dermal fibroblast [30]. The reason may be because gingival fibroblasts express specific molecules involved in the regulation of inflammation and extracellular matrix remodeling in comparison to other fibroblasts. It may explain the ability of gingival wounds to heal faster with less scar formation as compared to skin wounds [13, 32, 33]. From these results, our next study will focus on the anti-inflammatory and antioxidant properties of our nano-curcumin by in vitro inflammation model using LPS induced gingival fibroblasts. Additionally, more studies with shorter treatment durations of nano-curcumin on hGFs and other oral cell types need to be performed to have a comprehensive understanding of nano-curcumin.

5. Conclusion

In this study, gelatin encapsulated curcumin nanoparticles GelCur was developed which remained physically stable and did not cause hGF cytotoxicity at concentrations <3.96 mg/ml. Our study showed that within the nontoxicity dose, GelCur did not alter the proliferation and migration of hGFs. The results suggest that GelCur can be used safely in oral fibroblasts in vitro. Further studies can focus on the antibacterial and antioxidant properties of GelCur in the oral environment.

Data Availability

Requests for access to the data in this study should be made to the corresponding author.

Ethical Approval

The use of human gingival tissues for research purposes was approved by the Ethics Committee of the University of Medicine and Pharmacy at Ho Chi Minh City (No. 277/DHYD-HDDD).

Conflicts of Interest

The authors declare that they have no conflicts of interest.


We would like to thank Associate Professor Tran Le Bao Ha, Department of Physiology and Animal Biotechnology, Laboratory of Tissue Engineering and Biomedical Materials, Faculty of Biology—Biotechnology, University of Science, Vietnam National University, Ho Chi Minh City, Viet Nam for supporting this study. This work was granted in part by The University of Medicine and Pharmacy at Ho Chi Minh City as No. 175/2018/HD-NCKH.


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Copyright © 2020 Mai Thi-Hoang Nguyen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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