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Solubility of mesalazine in pseudo-binary mixtures of choline chloride/ethylene glycol deep eutectic solvent and water at 293.15 K to 313.15 K
BMC Chemistry volume 17, Article number: 171 (2023)
Abstract
Mesalazine (5-ASA) is a medication utilized to treat inflammatory bowel diseases involving ulcerative colitis and Crohn’s disease. Mesalazine has fewer side effects but the low solubility and bioavailability of it is responsible for its delayed onset of action. Hence, the goal of this study is to determine the molar solubility of 5-ASA in aqueous pseudo-binary mixtures containing low toxic biocompatible choline chloride/ethylene glycol deep eutectic solvent (ChCl/EG DES) with DES mass fraction of 0.0–1.0 using a shake-flask technique at 293.2–313.2 K and approximately 85 kPa. The experimental results indicated that the solubility of 5-ASA enhanced by addition of DES mass fraction and also increasing temperature. The molarity values of 5-ASA were then modelled by some traditional cosolvency models, and regressed each model parameters. The back-computed molarity of 5-ASA using the selected cosolvency models presented a good consistency with the experimental data (lower mean percentage deviation than 5.14%). Moreover, the Gibbs and van’t Hoff equations were employed to compute the thermodynamic functions of 5-ASA dissolution process in ChCl/EG DES + water from the temperature dependency of solubility data. This analysis presented an endothermic and entropy-driven process of 5-ASA dissolution in ChCl/EG DES + water. Furthermore, enthalpy-entropy compensation analysis represented non-linear enthalpy dissolution vs. Gibbs free energy compensation plots with positive and negative slopes for 5-ASA whereas the positive and negative slopes were probably due to the enhance in solvation of 5-ASA by ChCl/EG DES molecules and the solvent-structure loosing, respectively.
Introduction
Mesalazine (mesalamine or 5-aminosalicyclic acid) is an aminosalicylate drug applied for treating mild to moderate inflammatory bowel disease involving active ulcerative colitis and Crohn's disease along with also to maintain remission once achieved [1]. Mesalazine (5-ASA) can also act as an intermediate drug for synthesizing some drugs [2]. This drug as a class IV drug has a low solubility in water [3] which affected its bioavailability and absorption and so the improvement its solubility in water has more importance in the pharmaceutical industry. It is known that measuring drug solubility in different aqueous and non-aqueous solvent mixtures can provide some useful information regarding the purifying raw drug in the production procedure and pre-formulation investigations [4]. In the literature, the solubility of 5-ASA has been increased by various ways including salt formation, pH adjustments [5], solid dispersion [6], and cosolvents [7, 8]. Among these methods, cosolvency is a traditional way to increment the drug solubility [9].
To date, the solubility profile of 5-ASA has been reported in different binary mixtures including propylene glycol (PG), polyethylene glycol 400 (PEG 400), ethanol, 1-or 2-propanol, acetonitrile, ethylene glycol (EG), polyethylene glycol dimethyl ether 250 (PEGDME 250) or N-methyl-2-pyrrolidone + water [4, 9,10,11,12,13,14,15,16], N-methyl-2-pyrrolidone, carbitol or PG + ethanol [17, 18]. However, some of these reported binary mixed solvents contain the volatile, high-toxic and costly organic solvents which has a negative effect on the environment. In this respect, the use of deep eutectic solvents (DESs) as a safer solvent (5th concept from green chemistry [19]) have been developed for the solubilization of some drugs [20, 21]. In the case of 5-ASA, its solubility in choline chloride/PG (ChCl/PG), betaine/PG, betaine/EG or betaine/glycerol DESs and their aqueous mixtures have investigated and reported an increase in solubility of 5-ASA in water after addition of DESs [20, 21]. Among the different H-bond acceptor used for the formation of DESs, ChCl is a cheap, renewable, non-toxic, and biodegradable quaternary ammonium salt and the corresponding DESs utilized broadly as a drug solubilization agent [20, 22,23,24]. As above-mentioned, the solubility of 5-ASA has been determined in neat ChCl/PG DES and its aqueous mixtures [20]; however, the high viscosity of this DES (72.10 mPa s at 298.15 K) [25] can be affected the drug solubilization in mixtures. For identifying the role of ChCl-based DESs viscosity on their solubilization powers, this study aimed reporting 5-ASA solubility in molarity terms in neat ChCl/EG DES (in a molar ratio 1:2) (viscosity of DES is about 48.59 mPa s at 298.15 K [25]), water and their pseudo-binary mixtures in DES mass fractions from 0.1 to 0.9 employing a shake flask way at 293.2–313.2 K and 85 kPa. The molarity of 5-ASA were also represented by some cosolvency models including van’t Hoff [26], mixture response surface (MRS) [27], Jouyban-Acree [28], Jouyban-Acree-van’t Hoff [29], the modified version of Jouyban-Acree-van’t Hoff [30, 31], the combined nearly ideal binary solvent/Redlich–Kister (CNIBS/R-K) [32], \(\lambda h\) equation [33, 34], the modified Wilson and modified Wilson-van’t Hoff [35]. Aiming to report a main driving force of 5-ASA dissolution process in the above-mentioned mixtures the modified van't Hoff and Gibbs equations [36, 37] were utilized to compute the apparent thermodynamic parameters. The outcomes of this study can expand the available data for 5-ASA solubility in aqueous binary mixtures.
Materials and methods
Materials
5-ASA, EG and ChCl were the used materials in present study which a brief summary of their purities and chemical structures, sources are provided in Table 1 along with the more details regarding ethanol and deionized water utilized for diluting the saturated solutions before spectrophotometric experiments.
ChCl/EG DES was prepared in a molar ratio of 1:2 by mixixng a certain amount of ChCl and EG, as described with details in our previous work [38].
Solubility determination
The shake-flask method was used to determine the solubility of 5-ASA in ChCl/EG DES (in a molar ratio 1:2), water and ChCl/EG DES + water mixtures. In this respect, an extra amount of 5-ASA was added to tubes containing mono-solvents or binary mixed solvents (with a DES mass fraction of 0.1–0.9 prepared with a digital analytical balance (precision 0.0001 g, Shimadzu, 321-34553, Shimadzu Co., Japan). Then, the mixtures were shacked with a shaking speed of 85 rpm by shaker (rotator 2002, Behdad, Tehran, Iran) placed into incubator equipped with a temperature controlling system with the uncertainty of 0.1 K (Nabziran Industrial Group, Tabriz, Iran) for 48 h to attain an equilibrium, as previously reported in Refs. [9, 20]. After the equilibration, the drug precipitate was separated using centrifugation (Hettich D-7200 centrifuge) to collect the saturated solution followed then by diluting the obtained solutions with water: ethanol mixture (1:1) and assayed by a UV–visible spectrophotometer (Shimadzu UV-1800, Kyoto, Japan) at 299 nm. The concentrations of the diluted solutions in terms of molarity (C1, T) were achieved through the calibration curve (Absorbance = 2911C1, T + 0.016). A mean value was taken from three experiments at 293.2–313.2 K.
X-ray powder diffraction
For characterizing the solid phase equilibrated with water, neat ChCl/EG DES in compared with the raw 5-ASA, X-ray powder diffraction (XRD) analysis was utilized. To collect the XRD patterns a Siemens D500 X-ray diffractometer (Germany, Cu Kα radiation (λ = 1.54 A°), 2θ = 10–55°) was utilized. To perform this analysis the excess amounts of 5-ASA were equilibrated with mono-solvents of ChCl/EG DES and water at the same conditions described in the previous subsection. Then, these supernatant mixtures were centrifuged at 10,000 rpm for 30 min to separate the solid drug phase from the mixtures followed by washing the solid drug phases with distilled deionized water for three times and eventually dried at 298.15 K for 96 h.
Solubility models
The experimental molar solubilities of 5-ASA (C1,T) in ChCl/EG DES + water were represented utilizing some cosolvency models involving van’t Hoff [26], MRS [27], Jouyban-Acree [28], Jouyban-Acree-van’t Hoff [29], the modified version of Jouyban-Acree-van’t Hoff [30, 31], CNIBS/R-K [32,33,34], the modified Wilson and modified Wilson-van’t Hoff [35]. Descriptions of these models are provided in the following text:
The Jouyban-Acree model Eq. (1) correlates the drug solubility as a function of temperature and compositions [28].
Aiming to provide a more comprehensive model for representing the solubility of drugs in binary mixtures, Eq. (1) can combine with the van’t Hoff equation Eq. (2) [26] as Eq. (3) called the Jouyban-Acree-van’t Hoff model [29].
in these equations, \(C_{{_{1,T} }}\), \(C_{2,T}\) and \(C_{3,T}\) denote the molarity of 5-ASA in ChCl/EG DES + water, neat ChCl/EG DES and water, respectively, at temperature T/K. Ji terms were obtained from a linear regression of \(\ln C_{{_{1,T} }} - w_{2} \ln C_{2,T} - w_{3} \ln C_{3,T}\) or \(\ln C_{{_{1,T} }} - \left( {w_{2} \left( {A_{2} + \frac{{B_{2} }}{T}} \right) + w_{3} \left( {A_{3} + \frac{{B_{3} }}{T}} \right)} \right)\) against \(\frac{{w_{2} w_{3} }}{T}\), \(\frac{{w_{2} w_{3} }}{T}(w_{2} - w_{3} )\) and \(\frac{{w_{2} w_{3} }}{T}(w_{2} - w_{3} )^{2}\), respectively. \(w_{2}\) and \(w_{3}\) correspond to the mass fractions of ChCl/EG DES and water in the absence of 5-ASA. A1, B1, A2, B2 are the parameters of Eq. (2).
Also, the molar values of 5-ASA at different compositions of temperatures were modelled with the modified version of Jouyban-Acree-van’t Hoff model Eq. (4) [30, 31] with D1 to D7 as the model parameters.
To represent the drugs solubility at an isotherm condition the CNIBS/R-K equation Eq. (5) [32] and MRS model Eq. (6) were employed [27].
where Si and also \(\beta_{1}\) to \(\beta_{5}\) are correspondingly the model parameters of Eqs. (5) and (6). In Eq. (6), the values of \(w^{\prime}_{2}\) and \(w^{\prime}_{3}\) were archived from \(w^{\prime}_{2} = 0.96w_{2} + 0.02\) and \(w^{\prime}_{3} = 0.96w_{3} + 0.02\), respectively [27].
The modified Wilson Eq. (7), modified Wilson-van't Hoff Eq. (8) [35] and \(\lambda h\) equation Eq. (9) [33, 34, 38] are non-linear models for fitting the experimental molar values of 5-ASA in ChCl/EG DES + water mixtures.
in these models,\(\lambda_{23}\) and \(\lambda_{32}\) are the model parameters of Eqs. (7) and (8) whereas \(\lambda\) and \(h\) correspond to the model constants of Eq. (9) which obtained through a non-linear least square’s regression.
To evaluate the capability of each model in representing of 5-ASA solubility values in molarity terms, the mean percentage deviation (MPD), Eq. (10), is utilized.
where N is the number of mixtures considered in each case.
Thermodynamic properties of dissolution
Thermodynamic properties of 5-ASA dissolved in ChCl/EG DES + water including dissolution enthalpy (\(\Delta_{sol} H^{ \circ }\)), Gibbs free energy of dissolution (\(\Delta_{sol} G^{ \circ }\)) and dissolution entropy (\(\Delta_{sol} S^{ \circ }\)) were obtained from the temperature dependency of molar solubilities to provide some useful information regarding the molecular mechanisms involved in the solution processes. At the harmonic temperature (Thm = 303.0 K), the values of \(\Delta_{sol} H^{ \circ }\), \(\Delta_{sol} G^{ \circ }\) and \(\Delta_{sol} S^{ \circ }\) were calculated from the van’t Hoff and Gibbs equations Eqs. (11–14) [36, 37].
here R is the universal gas constant (8.314 J K−1 mol−1).
The contributions of enthalpy (\(\zeta_{H}^{sol}\)) and entropy (\(\zeta_{TS}^{sol}\)) toward dissolution process follow as [39]:
Results and discussions
XRD results
The patterns of raw 5-ASA and their equilibrated with liquor are presented in Fig. 1. Based on this figure, all the XRD patterns of solid of 5-ASA in equilibrium with ChCl/EG DES and water have the same characteristic peaks with the raw 5-ASA. Thereby, no polymorph transformation or solvate formation is found during the whole experiment processes.
Solubility of 5-ASA in aqueous solutions of ChCl/EG DES
The experimental molarity of 5-ASA (C1,T) in ChCl/EG DES + water at 293.2–313.2 K are summarized in Table 2 and visually plotted in Fig. 2. As presented in this Table, the solubility of 5-ASA is raised by raising DES mass fraction and also temperature reaching to the highest value in neat ChCl/EG DES at 313.2 K (0.0394 mol L−1).
The experimental C1,T values in water at 293.2–313.2 K were converted to the mole fraction unite (x1,T) and compared the mole fraction values reported in Refs. [4, 9, 11, 21, 40] to check the accuracy of present data. Table 3 gives the obtained results together with the individual percentage deviations (IPDs) computed with Eq. (17).
where \({\text{x}}_{1,T}^{\exp }\) and \({\overline{\text{x}}}_{1,T}^{rep}\) are correspondingly the experimental and mean mole fractions of 5-ASA. Also, the mole fraction solubility of 5-ASA determined in this work were compared graphically with the mole fractions reported in the literature [4, 9, 11, 15, 21] and the result is shown in Fig. 3. According to Table 3, the experimental and reported mean values of 103. x1,T in Refs. [4, 9, 11, 15, 21] are 0.083 and 0.095 at 293.2 K; 0.103 and 0.103 at 298.2 K; 0.118 and 0.113 at 303.2 K; 0.136 and 0.125 at 308.2 K and 0.153 and 0.133 at 313.2 K. From Table 3, the minimum and maximum of IPDs belong to 293.2 (≈ -14.7%) and 313.2 K (≈ 12.9%), respectively, which these differences may be attributed to the person-to-person error and the employed methodology. Figure 3 and the IPDs of Table 3 show that the measured solubility of 5-ASA in present study are not very different from the ones reported in the literature.
For the investigation of the influence of cosolvent type on the molarity values of 5-ASA, two defined parameters by Yalkowsky (\(\sigma\)) [41] Eq. (18) and our group (\(\omega\)) [8] Eq. (19) were calculated and compared for this drug. Since, the solubility of 5-ASA reported in the literature were in terms of mole fraction, the measured molarity of 5-ASA in this study has been first converted to the mole fraction unit and then utilized in these calculations. For this conversion, the density of ChCl/EG (1.116995 g cm−3) and water (0.997050 g cm−3) at 298.2 K reported in Ref. [42] was used and the results are summarized in Table 4.
where \(w_{\cos olvent,\max }\) is the mass fraction of cosolvent which achieves the highest 5-ASA solubility. Based on Table 4, the solubility of 5-ASA in the binary mixtures is increased in the order: N-methyl-2-pyrrolidone + water [15] (σ = 2.42 and ω = 2.42) > betaine/EG + water (σ = 2.10 and ω = 2.10) [21] > PEG 400 + water [40] (σ = 1.84 and ω = 1.84) > betaine/PG DES (σ = 1.80 and ω = 1.80) [21] > ChCl/EG DES (this work) (σ = 1.42 and ω = 1.42) > EG + water [4] (σ = 1.15 and ω = 1.15) > PG + water [9] (σ = 0.76 and ω = 0.91) > ChCl/PG + water [20] (σ = 0.70 and ω = 0.70) > 1-propanol + water [12] (σ = − 0.21 and ω = 1.74) ≥ ethanol + water [11] (σ = − 0.21 and ω = 1.05) > 2-propanol + water [13] (σ = − 0.26 and ω = 1.71) > acetonitrile + water [14] (σ = − 0.90 and ω = 1.80). This order shows that the mixtures containing DESs more solubilize 5-ASA in compared with the organic solvents and also the presence of EG as a HBD favors the solubilization of 5-ASA in compared with PG.
Solubility modelling
In the following, the solubilities of 5-ASA in ChCl/EG DES + water were correlated with the above-mentioned models and the results are tabulated in Tables 5, 6, 7, 8. In these correlations, the ChCl/EG DES was considered as an associated molecule according to the recent report by Jouyban et al., in regarding with the maintenance of H-bonding ChCl-EG interactions in the most of aqueous binary mixtures (except water mass fractions ≥ 0.7). On the other hand, by considering DES as an associated molecule the number of model’s parameters were also decreased. According to the colected reuslts in Tables 5, 6, 7, 8, the overral MPDs (OMPDs) of models follow the order: CNIBS/R-K (1.4%) < van’t Hoff (1.6%) < modified Wilson (2.1%) < MRS (≤ 2.6) < modified version of Jouyban-Acree-van’t Hoff (3.2%) < Jouyban-Acree (3.7%) < Jouyban-Acree-van’t Hoff (3.9%) < modified Wilson-van’t Hoff (≤ 3.8) < λh (5.1%). The low values of OMPDs in Tables 5, 6, 7, 8 (≤ 5.1%) prsesnted a good reliability of each model.
Moreover, the minimum number of experimental data, i.e. the C1,T values in mono-solvents of water and ChCl/EG DES at 293.2 and 313.2 K and also in ChCl/EG DES + water mixtures at w2 = 0.3, 0.5 and 0.7 at 298.2 K were selected and trained the models of Jouyban-Acree, Jouyban-Acree-van’t Hoff and the modified Wilson-van’t Hoff models to obtain the models parameters (see Table 9). The trained models were then utilized to predicted the molarity of 5-ASA in other w2 at each temperature (w2 = 0.1 to 0.9 at 293.2 K, 303.2 K, 308.2 K and 313.2 K and also w2 = 0.0–0.2, 0.4, 0.6, 0.8–1.0 at 298.2 K). From Table 9, it is concluded that the prediction ability of models is acceptable; however, Jouyban-Acree-van’t Hoff model with a lower MPD% (≤ 3.9%) is more applicable than the others. A good performance of the Jouyban-Acree-van’t Hoff model in predicting of solubility data can be visually observed by plotting the predicted solubility of 5-ASA from this trained model and the experimental solubility, as seen in Fig. 4.
Thermodynamic functions of dissoultion and mixxing of 5-ASA
The apparent thermodynamic parameters of 5-ASA dissolution in ChCl/EG DES + water mixtures including ΔsolG°, ΔsolH° and ΔsolS° were calculated from plotting the lnC1,T against the 1/T-1/Tm using their slopes and intercepts presented in Fig. 5. According to this Figure, all mixtures presented a linear trend with a negative slope, showing that the solubility of 5-ASA increase by increasing temperature (\(\Delta_{sol} H^{ \circ }\) > 0). Table 10 gives the thermodynamic parameters calculated in the studied mixtures. The positive values of parameters for all mixtures illustrated that the solubility of 5-ASA was an endothermic and entropy-driven procedure (higher values of \(\Delta_{sol} S^{ \circ }\) in compared with the values of \(\Delta_{sol} H^{ \circ }\)) in ChCl/EG DES + water. From Table 10, it is clearly obvious that the values of ΔsolG° ranged from 8.51 to 12.72 kJ mol−1 with the lowest and highest values observed in neat ChCl/EG DES and neat water, respectiely, indicating that the dissolution of 5-ASA in ChCl/EG DES + water mixtures was feasibile at neat DES in good agreement with the solubility measurements.
Table 10 reports also the values of \(\zeta_{H}^{sol}\) and \(\zeta_{TS}^{sol}\) which computed with Eqs. (15) and (16), respectively. For all mixtures \(\zeta_{H}^{sol}\) > \(\zeta_{TS}^{sol}\) which shows that the enthalpy is the main contributor of \(\Delta_{sol} G^{ \circ }\) in 5-ASA dissolution process.
The enthalpy-entropy compensation analysis were carried out and the result is plotted in Fig. 6. From this Figure, the non-linear trend observed with the negative slopes in 0.0 ≤ w2 ≤ 0.3 and 0.4 ≤ w2 ≤ 1.0 along with the positive slopes in the other compositions. The negative and positive slopes in this plot presented that the driving mechanism is the entropy as a results of hydrophobic hydration around the non-polar groups of 5-ASA and enthalpy as a consequent of better solvation of 5-ASA by the cosolvent, respectively.
Conclusions
Equilibrium solubility of mesalazine (5-ASA) in pseudo-binary mixed solvents of choline chloride/ethylene glycol deep eutectic solvent (ChCl/EG DES, molar ratio of 1:2) and water were measured at 293.2–313.2 and ambient pressure. After that, the experimental solubility was modelled and the solubility data were back-computed with the cosolvency models including van’t Hoff, mixture response surface (MRS), Jouyban-Acree, Jouyban-Acree-van’t Hoff, the modified version of Jouyban-Acree-van’t Hoff, the combined nearly ideal binary solvent/Redlich–Kister (CNIBS/R-K), \(\lambda h\) equation, the modified Wilson and modified Wilson-van’t Hoff. The following results were obtained from this study:
-
From surveying the solubility profile of 5-ASA, a solvent composition and temperature dependency was observed; so that, more solubilization of 5-ASA achieved in high mass fraction of DES and temperature (0.0394 mol L−1 at 313.2 K).
-
From investigating the thermodynamic parameters of 5-ASA dissolution process in the investigated mixtures, observed an entropy-driven and endothermic process with the lowest Gibbs free energy in neat ChCl/EG DES.
-
According to the low mean percentage deviation of models (≤ 5.14%) for the back-computed data with the cosolvency models, an acceptable ability of the models for modelling of 5-ASA solubility was confirmed.
The measured data in this study not only expanded the solubility database of 5-ASA in cosolvency mixtures but also can be used for the selection of a suitable mono- or binary solvent mixtures to purify of 5-ASA through the crystallization.
Availability of data and materials
The datasets utilized and/or analyzed during this study are available from the corresponding author on reasonable request.
Abbreviations
- 5-ASA:
-
Mesalazine
- ChCl/EG DES:
-
Choline chloride/ethylene glycol deep eutectic solvent
- XRD:
-
X-ray powder diffraction
- PG:
-
Propylene glycol
- PEG:
-
400 Polyethylene glycol 400
- EG:
-
Ethylene glycol
- PEGDME 250:
-
Polyethylene glycol dimethyl ether 250
- CNIBS/R-K:
-
The combined nearly ideal binary solvent/Redlich–Kister
- MPD:
-
Mean percentage deviation
- IPDs:
-
Individual percentage deviations
- OMPDs:
-
Overall mean percentage deviation
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This report is a part of the results of E. Armani’ Pharm. D. Thesis submitted to the Faculty of Pharmacy, Ardabil University of Medical Sciences, Ardabil, Iran. The work is supported by Ardabil University of Medical Sciences under grant number of 400000650.
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EA: Performed the experiments, Investigation, PJ: Formal analysis, Writing-original draft. Salar Hemmati: Materials, Writing-review & editing, ER: Analyzed and interpreted the data, MBJ: Writing-review & editing, Funding acquisition. AJ: Conceptualization, Writing-review & editing, Supervision.
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Armani, E., Jafari, P., Hemmati, S. et al. Solubility of mesalazine in pseudo-binary mixtures of choline chloride/ethylene glycol deep eutectic solvent and water at 293.15 K to 313.15 K. BMC Chemistry 17, 171 (2023). https://doi.org/10.1186/s13065-023-01064-4
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DOI: https://doi.org/10.1186/s13065-023-01064-4