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Compaction and tableting properties of composite particles of microcrystalline cellulose and crospovidone engineered for direct compression

Abstract

Background

Excipients with improved functionality have continued to be developed by the particle engineering strategy of co-processing. The aim of this study was to evaluate the compaction and tableting properties of composite particles of microcrystalline cellulose (MCC) and crospovidone (CPV) engineered by co-processing.

Results

Heckel analysis of the compaction behavior revealed a decrease in plasticity of co-processed excipient (CPE) when compared to MCC due to an increase in Heckel yield pressure from 144 to 172 MPa. The compressibility-tabletability-compactibility (CTC) profile revealed a decrease in individual parameters for CPE when compared to MCC. CPE was found to be more sensitive to the lubricant effect of sodium stearyl fumarate (SSF) when compared to MCC and less sensitive to magnesium stearate (MST) when compared to MCC. A higher dilution potential was obtained for MCC (60%) compared to 44% for CPE when metronidazole was used as model drug. Tableting properties revealed that metronidazole tablets generated with CPE by direct compression disintegrated within 15 min and gave a rapid drug release when compared to MCC as a direct compression (DC) excipient.

Conclusion

The compaction and tableting properties of CPE were characterized and yielded tablets with better disintegration and drug release profile when compared to MCC. This study, therefore, confirms the suitability of co-processing as a proven strategy in engineering the performance of excipients.

Background

The development of novel excipients by co-processing has witnessed a surge in the last few decades. Co-processing as a particle engineering technique has proven to be a useful strategy in improving the functionality or performance of existing single component excipients like lactose [1], microcrystalline cellulose [2], and starch [3, 4]. Some of the functionality improvements so far recorded with co-processed excipients include enhanced flowability, compressibility, dilution potential, lubricant sensitivity, stability, moisture sensitivity, superdisintegrating ability, etc. These changes have been ascribed to physical modifications in the particle structure of excipients without recourse to their chemical properties. Hence, changes in the functionality of the developed co-processed excipients have been directly linked to changes in their fundamental properties like particle size, shape, and morphology [5]. Many of the co-processed excipients developed so far were designed for use as multifunctional excipients in direct compression formulations because of the growing preference for direct compression as the method of tablet production [6]. An ideal direct compression excipient should be multifunctional in performance, demonstrating sufficient flowability and compressibility as they constitute more than 50% of the tablet formulation and so determine to a large extent the outcome of the formulation. Hence, co-processed excipients designed for direct compression play a crucial role in tablet formation. The method of direct compression involves a two-step process of blending the formulation ingredients and compressing into tablets at suitable compression pressure. It is therefore necessary to evaluate the compaction behavior of co-processed excipients because the compaction behavior determines the tabletability or manufacturability of the formulation [7]. Compaction behavior refers to the mechanical response of a powder to the applied pressure [8]. During compaction, pressure is applied to transform the powder bed into solid compacts of suitable mechanical strength. This is a necessary step in the tablet-making process. Tableting materials under pressure may exhibit the mechanism of plastic deformation, elastic deformation, or fragmentation depending on the particle structure and chemical composition of the material [9]. Materials undergoing plastic deformation promotes the formation of tablets because they increase the bonding area between particles (compressibility) and bonding strength (compactibility) resulting in improved tabletability [10]. Hence, the present study aims to evaluate the compaction and tableting properties of the composite particles of MCC and CPV designed for use as a co-processed multifunctional excipient in direct compression formulations. Compaction behavior of the co-processed excipient will be characterized using the conventional methods of Heckel and Kawakita analysis. In addition, compressibility-tabletability-compactibility (CTC) profile of the co-processed excipient in comparison to the constituent excipients, MCC, and CPV, will be generated with data obtained from compaction studies. Tablets containing metronidazole as the model drug will be formulated by direct compression. Dilution potential studies will be carried out to determine the drug-loading capacity of the excipient that will yield tablets of sufficient mechanical strength. To the best of our literature review, no such study has been carried out.

Methods

Materials

The following materials were used for the study: metronidazole (MTZ) (Central Drug House (P) Ltd. New Delhi, India), microcrystalline cellulose (MCC), Prosolv® (PSV), crospovidone (CPV), sodium stearyl fumarate (SSF) (JRS Pharma, Germany), paracetamol (PCM), xylene, magnesium stearate (MST) (BDH Chemicals Ltd Poole, England), and colloidal silicon dioxide (Evonik Industries, Germany).

Preparation of co-processed excipient (CPE)

The co-processed excipient (CPE) was prepared by wet massing technique as described by Goyanes et al. [11] with slight modifications. The quantities of microcrystalline cellulose (MCC) and crospovidone (CPV) were calculated based on the optimized ratio, weighed out on an electronic balance (Mettler, Philip Harris Ltd, England) and pre-mixed for 5 min using a mortar and pestle. The powder blend was further massed with 20 mL of distilled water and the wet mass screened through a 0.5 mm sieve to achieve uniformity in particle size. The co-processed material was then allowed to dry in an oven (Gallenkamp Oven BS size 3, England) at 40 °C for 1 h and kept in an airtight container for further studies.

True density

True densities of MCC, CPV, and CPE were determined using the liquid displacement method as described by Olayemi et al. [12] with slight modification. The empty weight of a pycnometer (density) bottle was obtained, filled with xylene, and its weight determined. A sample of the powder weighing 2 g was added into the bottle and the excess liquid spilled wiped off. The new weight was determined, and Eq. 1 below was used to calculate true density of the material having obtained the weight of xylene displaced by the sample.

$$ {\rho}_T=\frac{\mathrm{weight}\ \mathrm{of}\ \mathrm{sample}\times \rho\ \mathrm{of}\ \mathrm{xylene}\ (0.864)}{\mathrm{weight}\ \mathrm{of}\ \mathrm{xylene}\ \mathrm{displaced}\ \mathrm{by}\ \mathrm{sample}} $$
(1)

Compaction studies

Compaction profiles of MCC, CPV, and CPE were generated using the Powder Compaction Analyser (PCA-028-1208, London, UK). Each tablet was prepared by manual filling of powder weighing ~ 80 mg into the die cavity measuring 5 mm and compressed at a speed of 120 mm/min at compression loads ranging from 100 to 500 kg (50–250MPa). For each pressure, a minimum of five tablets were compressed for reproducibility [13]. The parameters of weight, thickness, and hardness of tablets were measured using a balance (UWE serial no 136271/05), Micrometer (Mitutoyo Tokyo, Japan), and Tablet Tensile Analyser (TTA 331-1750, London, UK), respectively, and used to compute the volume [4], apparent density [14], and relative density (D) [15] of the tablets from the equations below:

$$ \mathrm{Volume}\ (V)=\pi {r}^2h $$
(2)
$$ \mathrm{Apparent}\ \mathrm{density}\ \left({\rho}_A\right)=\frac{\mathrm{weight}\ \mathrm{of}\ \mathrm{tablet}\ (w)}{\mathrm{Volume}\ \left(\pi {r}^2h\right)} $$
(3)
$$ \mathrm{Rel}.\mathrm{density}\ (D)=\frac{\rho_A}{\rho_T} $$
(4)

where r is the radius of the tablet and h is the thickness of the tablet

The compaction data obtained was used to generate Heckel [16], Kawakita [17], compressibility, compactibility, and tabletability plots for each material.

$$ \mathrm{Heckel}\ \mathrm{equation},\mathit{\ln}\left(\frac{1}{1-D}\ \right)= KP+\mathrm{A} $$
(5)

where D is the relative density of the compact, P is the applied pressure, the constant K is a measure of the plasticity of a compressed material, and constant A is related to the die filling and particle rearrangement before deformation and bonding of the discrete particles.

$$ \mathrm{Kawakita}\ \mathrm{equation},\frac{P}{C}=\frac{P}{a}+\frac{1}{ab} $$
(6)

where P is the applied pressure, C is the degree of volume reduction, parameters “a” and “b” are constants relating to the total degree of powder volume reduction and the yield strength of particles, respectively.

Lubricant sensitivity ratio (LSR)

The sensitivity of MCC and CPE to the effect of lubricant was evaluated by preparing tablets with or without MST/SSF using a Single Punch Tablet Press. Lubricant sensitivity ratio [18] was computed using the equation below

$$ \mathrm{LSR}=\frac{T_o-{T}_L}{T_o}\times 100\% $$
(7)

Where T0 = tensile strength without lubricant, TL = tensile strength with lubricant.

Dilution potential

Dilution potential of MCC and CPE was determined by preparing tablets of different formulations containing increasing concentration of the active pharmaceutical ingredient (MTZ/PCM) in the following ratios: 20:80, 40:60, 50:50, 60:40, and 80:20 [2]). Tablets were prepared for each compression blend by direct compression on a Single Punch Tablet Press and tensile strength of tablets determined after 24 h of elastic recovery. A graph of % drug composition against tensile strength was drawn, and the dilution potential of each material was extrapolated from the plot.

Tableting

Four formulations of tablets containing MTZ as the model drug were prepared by direct compression according to the formula given in Table 1. Tablets weighing ~ 500 mg were compressed on a Single Punch Tablet Press (Type EKO, Erweka, Apparatebau-G.m.b.H, Germany) using 12 mm flat-faced punches compressed at a load of 7 KN. The processed tablets were kept for 24 h and evaluated for its physical properties.

Table 1 Formula for preparing tablets containing metronidazole as model drug using MCC, CPE, PME, and PSV as DC excipients

Evaluation of tablet properties

Physical properties of tablets prepared for each formulation were evaluated according to BP requirements [19]. The weights of 20 tablets picked at random from each formulation were obtained, and the mean and standard deviations were calculated to ascertain uniformity in weight of tablets for each formulation.

The thickness and crushing strength of 10 randomly sampled tablets from each formulation was measured using the Digital Vernier Calliper and Monsanto Hardness Tester, respectively. The mean and standard deviation for each parameter was recorded. The corresponding tensile strength (TS) was calculated for each formulation using the Fell and Newton equation [20] given below:

$$ Ts=\frac{2F}{\pi dt} $$
(8)

where F is the crushing strength, and d and t are the diameter and thickness, respectively.

Ten tablets from each formulation were randomly selected, accurately weighed, placed in the chamber of Digital Friability Test Apparatus 903 (Environmental & Scientific Instruments CO., India), and allowed to rotate at 25 rpm for 4 min. Tablets were removed from the chamber, gently cleaned from dust particles, and accurately weighed. Friability was calculated in terms of percentage weight loss using Eq. 9:

$$ \mathrm{Weight}\ \mathrm{loss}\ \left(\%\right)=\frac{W_i-{W}_f}{W_i}\times 100\% $$
(9)

where, wi and wf are the weights of the tablets before and after friability test, respectively.

The time taken for six tablets from each formulation to disintegrate was determined using the BJ-3 Disintegration Tester (Ningbo Hinotek Instrument Co., Ltd, China). The experiment was conducted in a controlled temperature environment of 37 ± 0.5°C using distilled water as the medium for disintegration. The mean and standard deviation of six replicates were computed and recorded for each formulation.

In vitro dissolution studies were carried out on the four formulations using 0.1 N HCl as dissolution medium. A single tablet was placed in a beaker containing 900 mL of 0.1 N HCl set at 37 °C and allowed to rotate at 100 rpm. Five milliliters of samples was withdrawn at 5, 10, 20, 30, 45, and 60 min, respectively, and replaced with equal volume of 0.1 N HCl after each withdrawal. The samples collected were filtered and sufficiently diluted with 0.1 N HCl before taking the absorbance readings at 277 nm using the UV spectrophotometer (UV–1800 Spectrophotometer, Shimadzu Corporation, USA). The amount of drug released (%) was calculated based on the equation, y = 0.0395x + 0.1314, derived from the calibration curve of metronidazole and a plot of % drug released against time was generated for the four formulations.

Statistical analysis

Data analysis was carried out in Microsoft Excel using the analytical tool ANOVA; single factor to evaluate the differences in tableting properties across the formulations. Differences in tableting properties were considered significant at p ≤ 0.05.

Results

True density

A mean value of 1.48 g/mL was obtained as true density for both MCC and CPE in comparison to a lower value obtained for CPV (1.23 g/mL). This implies that co-processing did not significantly affect the true density of MCC.

Compaction studies

Heckel and Kawakita plots presenting the compaction profiles of MCC, CPV, and CPE are displayed in Fig. 1. The Heckel plot (Fig. 1a) shows that the degree of densification (1/1-D) increases as the compaction pressure increases while the extent of volume reduction (P/C) increased with increase in compaction pressure as seen in the Kawakita plot (Fig. 1b).

Fig. 1
figure1

a Heckel plot. b Kawakita plot

The compaction parameters resolved from both plots are summarized in Table 2. Mean yield pressure, a Heckel parameter, which measures the degree of plasticity in a material was ranked in the following order, MCC<CPE<CPV implying that MCC had the least value of 144.93 MPa corresponding to a greater degree of plasticity. The DA values representing the total degree of densification occurring at the initial stages of compression was relatively the same for MCC and CPE but differed significantly from that of CPV. Densification occurring as a result of particle slippage and rearrangement was quantified using D0 parameter, and the values obtained for MCC and CPE were similar compared to that of CPV which was relatively higher (0.49) implying that the extent of densification occurring as a result of particle slippage and rearrangement was higher with CPV compared to the other two materials. The DB parameter representing the degree of densification occurring as a result of particle fragmentation was relatively similar for MCC and CPE and higher when compared to CPV.

Table 2 Heckel and Kawakita parameters for MCC, CPE, and CPV

The Kawakita parameters shows that the degree of compressibility for all three materials represented by “a” was found to be similar. However, the compression effort (PK) required to achieve a 50% reduction in the volume of the powder bed during compression was found to be much lower for both MCC and CPE in comparison to CPV implying a greater degree of plasticity.

The CTC profile of MCC, CPV, and CPE is presented in Fig. 2. The compressibility plot denoted in Fig. 2a shows the effect of compaction pressure on the porosity of compacts. There was a decline in porosity of compacts as the applied pressure increased for all three materials. The extent of reduction in porosity was higher in MCC and CPE compared to CPV. The plot shows that the level of porosity reduction seen in MCC and CPE compacts was relatively the same.

Fig. 2
figure2

a Compressibility plot. b Compactibility plot. c Tabletability plot

The compactibility plot displayed in Fig. 2b illustrates the effect of porosity on tensile strength of compacts produced. The plot shows that the tensile strength of compacts increased with decreasing porosity. The compactibility profile of all three materials was ranked in the following order: MCC > CPE > CPV. At all levels of porosity, the compacts of MCC returned higher tensile strength values compared to those of CPE and CPV.

The tabletability plot presented in Fig. 2c shows the effect of compaction pressure on tensile strength of compacts produced with all three materials. Tensile strength of compacts increased with increase in compaction pressure. At all pressures evaluated, the tensile strength of MCC compacts were consistently higher than those of CPE and CPV. The tabletability profile of the three materials were thus ranked in the following order: MCC > CPE > CPV.

LSR

The sensitivity of MCC to SSF was 45% as against 59% for CPE while the sensitivity of MCC to MST was 79% compared to 63% for CPE. MCC was found to be less sensitive to SSF compared to CPE and more sensitive to MST compared to CPE. Overall, both materials were more sensitive to the action of MST compared to SSF because the values obtained for SSF were much lower compared to those of MST.

Dilution potential

Figure 3 is a graphical representation of the outcome of dilution potential studies. Figure 3a shows that the tensile strength of PCM tablets formulated with either MCC or CPE as DC excipient decreased as the proportion of drug in the formulation increased. About 80% of MCC was required to produce tablets having a tensile strength of 2 MPa in comparison to about 96% of CPE that was required to produce tablets of the same tensile strength. This implies that MCC had a higher dilution potential compared to CPE with respect to PCM as model drug.

Fig. 3
figure3

Dilution potential plot of MCC and CPE using a PCM and b MTZ as model drugs

In the case of MTZ as model drug (Fig. 3b), the plot shows that tensile strength of tablets also decreased with increase in the proportion of drug in the formulation. Comparing the two excipients, 40% of MCC was required to produce tablets of 2 MPa compared to 56% with CPE. This implies that MCC has a higher dilution potential compared to CPE.

Tablet properties

The tableting properties of formulations I–IV are summarized in Table 3. The mean weight of tablets ranged from 491 to 497 mg with formulations I and IV having the least tablet mean weight. Drug content of metronidazole varied from 86.72 to 106.47% with formulations III and I having minimum and maximum drug content, respectively. Tablet thickness showed that values ranged from 3.83 to 3.90 mm. The tensile strength values obtained for the formulations were ranked in the following order: III > II > I > IV, where formulations containing PME and PSV as DC excipient returned the highest and lowest mean tensile strength values, respectively. The friability values obtained were consistent with the results obtained for tensile strength and all the formulations passed the friability test by not exceeding 1% except for formulation IV (PSV) that produced weak tablets having a friability > 1%. The time taken for disintegration of tablets across the formulations ranged from 1.33 to 26.88 min, with PSV and MCC yielding the minimum and maximum values of disintegration time, respectively.

Table 3 Tableting properties of formulations I–IV

The amount of drug released (%) with time was represented in Fig. 4 as a dissolution plot. The time taken to release 80% of metronidazole was ranked in the following order: PSV < CPE < PME < MCC. The extent of drug release was highest with CPE, followed by PSV and PME and then MCC. All the formulations passed the dissolution test based on the USP requirement that 70% of the drug should be released in 45 min.

Fig. 4
figure4

Drug release profile of MCC, CPE, PME, and Prosolv showing the amount of drug released with time

Discussion

Compaction studies

As evidenced by Heckel analysis, compaction behavior of CPE was characterized by a lower degree of plastic deformation compared to MCC. This may have been caused by the introduction of CPV, a brittle material, into the particle structure of MCC during co-processing thereby increasing its hardness and making it more resistant to plastic deformation. Hence, a higher yield pressure was required to initiate deformation in CPE as compared to MCC. Reduction in plastic deformation of MCC by co-processing, however, lowered the compressibility and compactibility as seen in CPE (Fig. 2) and by extension the tabletability profile of CPE (Fig. 2). Due to a reduction in compressibility and compactibility, tablets of lower tensile strength were obtained with CPE characterized by some degree of porosity relatively higher than that of MCC. This led to a rapid disintegration of tablets prepared with CPE as opposed to those of MCC whose disintegration time exceeded the requirement for immediate release tablets (Table 3). Hence, the disintegration functionality of MCC was modified by lowering its extent of plastic deformation which created a more porous structure that facilitated the rapid uptake of water due to the wicking properties of CPV leading to rapid disintegration of tablets. This agrees with the findings of Rojas and Kumar [15] who co-processed MCC II with colloidal silicon dioxide to yield an excipient with rapid disintegrating effect.

True density of CPE and MCC were similar, suggesting that the degree of molecular packing was not affected by co-processing. True density of a material has been able to relate the tabletability profile of a material to the interparticulate bonding strength [21]. However, the tabletability profile of MCC differed significantly from that of CPE owing to reduced interparticulate bonding caused by the presence of CPV in the particulate structure of MCC. Hence, similarity in molecular packing behavior (true density) does not necessarily translate to similar tabletability.

LSR

Lubrication is a tableting operation carried out prior to compression to lower interparticulate friction and prevent sticking of the tableting material to punch and die surfaces and to facilitate ejection of tablets after decompression [22, 23]. Lubricants exert their effect externally by coating the particle surfaces or forming a film layer at interparticulate surfaces [24]. This phenomenon interferes with interparticulate bonding and manifests as a reduction in tensile strength. Lubricant sensitivity testing is therefore carried out to quantify the degree of sensitivity of the tableting material to lubricant action. Depending on the mechanical properties, materials that are plastic deforming are more sensitive to lubricants compared to brittle materials [25].

Comparing the responses of MCC and CPE to lubricant action, both materials were generally more sensitive to MST compared to SSF possibly because MST has a greater degree of hydrophobicity [26, 27]. CPE was found to be more sensitive to the action of SSF when compared with MCC. This has been attributed to flowability of CPE that generates high shear forces during mixing leading to more efficient particle coating by the lubricant resulting in higher lubricant sensitivity [18]. However, MCC was found to be more sensitive to the action of MST compared to the response of CPE. Due to the smaller particle size of MCC, a relatively larger surface area of the particles was made available for coating by the lubricant giving rise to tablets of lower tensile strength after lubrication due to a reduction in interparticulate bonding [18]. This implies therefore that SSF will be a better candidate for lubrication compared to MST.

Dilution potential

The ability of a DC excipient to incorporate a certain amount of active pharmaceutical ingredient (API) and form tablets of sufficient mechanical strength is described as the dilution potential of the excipient [28]. Dilution potential depends on the compaction behavior of the excipient and varies with API [28]. Plastic deforming materials tend to have better dilution potential compared to materials that deform by brittle fracture [18]. Dilution potential of MCC and CPE obtained with PCM were found to be significantly lower when compared to the dilution potential of MCC and CPE obtained with MTZ. This has been attributed to the brittleness and high elastic recovery exhibited by PCM upon compression [29,30,31]. On account of this, PCM, a high-dose drug, could not be compressed into tablets of convenient size by direct compression because of its low dilution potential. Hence, MTZ was selected as the drug of choice for the formulation of tablets by direct compression. Tablets designed to contain high-dose poorly compressible drugs are best prepared by wet granulation [32, 33]. A better dilution potential was obtained with MCC compared to CPE with respect to MTZ as model drug possibly because of the plastic deforming ability of MCC [34, 35]. The plastic-deforming ability of MCC was lowered, however, when co-processed with CPV into CPE thereby reducing its capacity to take up more of the poorly compressible drug resulting in tablets of lower tensile strength due to a reduction in interparticulate bonding during compression. The dilution potential of MCC with respect to MTZ was therefore lowered as a result of co-processing to yield CPE.

Tableting properties

The quality of tablets obtained correlated with the compaction properties of the excipients used in tablet formulation. Tablets of relatively higher TS were obtained with MCC because of its excellent binding and tabletability profile associated with its tendency to undergo plastic deformation during compression [36]. The hardness of MCC tablets was reflected in the disintegration time which exceeded 15 min due to the inability of the disintegration medium to overcome the tightly bound tablet matrix created by extensive bonding area and strong interparticulate bonding occurring during tablet formation. The CPE tablets, however, disintegrated in less than 15 min owing to the porous structure generated as a result of its lowered tabletability profile. This ensured the rapid uptake of water that facilitated the breakup of the tablet during disintegration. Drug-release profile was consistent with the disintegration as tablets of CPE attained maximum drug release in rapid time compared to MCC tablets that released < 90% of the drug after 60 min.

Conclusion

Co-processing of MCC and CPV yielded a composite material (CPE) that differed in its compaction and tableting behavior. The compaction behavior of CPE showed a material with a lesser degree of plasticity and tabletability when compared to MCC giving rise to tablets that disintegrated within 15 min. Hence, the tableting properties of disintegration and drug release were enhanced by reason of co-processing. This study confirms the suitability of particle engineering techniques like co-processing in developing novel excipients with improved performance pharmaceutically.

Availability of data and materials

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

API:

Active Pharmaceutical Ingredient

ANOVA:

Analysis of variance

CPE:

Co-processed excipient

CPV:

Crospovidone

CTC:

Compressibility-tabletability-compactibility

DC:

Direct compression

DT:

Disintegration time

LSR:

Lubricant sensitivity ratio

MCC:

Microcrystalline cellulose

MST:

Magnesium stearate

MTZ:

Metronidazole

PCM:

Paracetamol

PME:

Physical mixture of excipients

PSV:

Prosolv®

SSF:

Sodium stearyl fumarate

TS:

Tensile strength

USP:

United States Pharmacopoeia

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Acknowledgements

The authors acknowledge JRS Pharma, Germany, and Evonik Industries, Germany, for the gift samples of excipients provided for the study.

Funding

No external funding was received for this study. The resources used for the study were provided by the authors.

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FH collected the data and prepared the first draft of the manuscript. YEA designed the study, interpreted some of the results, and made critical revisions to the entire manuscript. CO collected and analyzed data for compaction studies. ARO and MG supervised the study and reviewed the manuscript. All the authors read and approved the final manuscript.

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Correspondence to Yonni Eshovo Apeji.

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Haruna, F., Apeji, Y.E., Oparaeche, C. et al. Compaction and tableting properties of composite particles of microcrystalline cellulose and crospovidone engineered for direct compression. Futur J Pharm Sci 6, 35 (2020). https://doi.org/10.1186/s43094-020-00055-9

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Keywords

  • Particle engineering
  • Microcrystalline cellulose
  • Crospovidone
  • Compaction studies
  • Tablet