application of direct crystallization for racemic compound ketoprofen
TRANSCRIPT
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Chapter 7
Application of direct crystallization for racemic
compound ketoprofen
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7.1 Introduction
As mentioned before, the direct crystallization for partially resolvedenantiomers can be used for the racemic compound. According the phase diagram,
whether we can obtain the desired pure enantiomer depends on the partially resolved
mixtures initial position and eutectic composition. When the crystallization initial
solution composition is located inside the existence region of pure enantiomers, this
crystallization process will afford a pure enantiomer. In the last chapter, a systematic
preferential crystallization process was successfully applied for the favorable racemic
compound mandelic acid. In this chapter this strategy was extended to another
racemic compound system: unfavorable racemic compound. For this compound, the
solubility of racemate is smaller than that of pure enantiomer and it shows the most
narrow operation region to obtain pure enantiomers by crystallization. Ketoprofen
was chosen for this study.
There were some methods already applied for the ketoprofen enantioseparation,
including chiral chromatography and enzymatic separation.
For a chromatography, several direct/indirect liquid chromatographic methods
involving a variety of chiral phases have been reported for the ketoprofen
enantioseparation and its enantiomer analysis. For example, a new chiral stationary
phase using flavoprotein, a glycoprotein present in chicken egg-white, was developed
for high-performance liquid chromatography by Nariyasu et al. in 1992. The column
with this chiral stationary phase could achieve baseline separations for ketoprofen.
Also, Zhu (1999) reported that -cyclodextrin (CD) and its derivatives HP- -CD,
DM- -CD, and TM- -CD had been employed as chiral selectors for the separation
of ketoprofen by capillary zone electrophoresis. And also, Pehourcq (2001) found that
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flurbiprofen and ketoprofen were resolved from their racemic forms using a
vancomycin chiral stationary phase known as ChirobioticV. In addition, according to
Aboul-Enein (2003), ketoprofen was also resolved on Kromasil tartardiamide-DMB
chiral stationary phase. In this process, optimum resolution was achieved using a
mobile phase consisting of hexane: tert-butyl methyl ether: acetic acid (75 :25: 0.1
v/v/v) at flow rate of 1 ml/min.
An enzymatic separation can be used for ketoprofen enantioseparation too.
Antona et. al. (2002) observed that Immobilized lipase from Candida antarctica
(Novozym 435) can catalyze the enantioselective etherification of (RS)-ketoprofen.
He found that the use of methanol in dichloropropane allows large scale separation for
ketoprofen. This method gave the desired (S)-ketoprofen with 96% ee as unreacted
enantioform. The (R)-enantiomer, recovered as ester, can easily undergo chemical
racemising hydrolysis and can be reused in the process.
Though several chiral separation methods were used for the enantioseparation
of ketoprofen, few studies have reported on using direct crystallization for partially
resolved enantiomers to get the pure (S)-ketoprofen. And there is little information
available on whether the coupling the directly crystallization with chromatography
could be used for chiral separation of ketoprofen.
Therefore, this chapter presents a study to obtain a enantiomerically enrichedketoprofen by using the HPLC with a semi-preparative column for the subsequent
systematical study of direct crystallization process. The critical supersaturation
control strategy and crystallization progression were investigated.
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7.2 Experiment and methods
7.2.1 HPLC collection of ketoprofen
The collection experiments were carried out with a Shimadzu chromatographic
system and used a chiralpak preparative HPLC AD-H column (dimension 250mm L x
10mm I.D) to collect ketoprofen whose mole fraction should be more than 0.96. The
mobile phase contained 90%hexane and 10% IPA. The temperature was 25oC and
flow rate was 3.5ml/min.
7.2.2 Direct crystallization process
The crystallization experiments were carried out in the same crystallization set-
up as described in Fig. 4.2. The controlled cooling profile (convex) was used on the
batch direct crystallization operation of ketoprofen. The start point was the sameenantiomeric composition with the partially resolved ketoprofen from HPLC
collection. It was the 96% mole percent (S)-MA saturated solution at 20 oC in the
mixed solvent ethanol and water with volume ration 0.9/1.0. Five batches direct
crystallization experiments were carried out starting from the same solution with
different modes, which are (a) Exp_01: with seeding and final temperature at 10 oC;
(b) Exp_02: with seeding and final temperature at 7.3 oC; (c) Exp_03: with seeding
and final temperature at 6.0 oC; (c) Exp_04: with seeding and final temperature at 0.7
oC; (f) Exp_05: without seeding until nucleation occurred.
The optical purity of crystal products were also measured by using HPLC. For
HPLC, the analyze AD-H column was also used to analyze product ee values. The
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separation conditions are as followed: hexane/IPA (90/10 v/v) as mobile phase, at
25C column temperature, flow rate of 0.8ml/min and UV-Vis detection at 254nm.
7.3 Result and discussion
7.3.1 Semi-preparative HPLC separation of Ketoprofen
As discussed in chapter 6, the loading capacity of ketoprofen on Chiralcel AD-
H was determined by injecting different amount of sample onto the column. It was
found that ketoprofen shows partial separation when sample loading reaches to 5.0mg,
shown in Fig. 7.1.
Fig 7.1 Partial separation of Kp on Chiralcel AD-H semi-preparative HPLC column(dimension 250mm L x 10mm I.D) at loadings 5.0mg per injection using hexane/IPA(90/10 v/v) as mobile phase, at 25C column temperature, flow rate of 3.5ml/min and
UV-Vis detection at 254nm.
Through semi-preparative chiral HPLC separation, the 96% mole percent S
enantiomer and pure Renantiomer of Kp were obtained by collecting two different
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fractions at two different retention time, t =17-22 mins and t =15.3-17mins, as
presented in Fig. 7.2. The optical purity of 96% mole percent Senantiomer collection
was analyzed on analytical chiral column with hexane/IPA (90/10 v/v) as the mobile
phase and a flow rate of 0.8ml/min, shown in Fig. 7.3. Then, the volume enough 0.96
mole fraction SKp can be obtained by using continuous HPLC separation with an
antosampler and automated fraction collector.
Fig 7.2 Fraction collection under semi-preparative HPLC separation of Kp onChiralcel AD-H column (dimension 250mm L x 10.00 mm I.D.) under separationconditions: hexane/IPA (90/10 v/v) as mobile phase, at 25C column temperature,flow rate of 3.5ml/min and UV-Vis detection at 254nm.Fraction (a) collected atretention time 15.3-17 minutes and fraction (b) is collected at 17-22 minutes.
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Fig 7.3 Chromatogram of fractions (b) obtained through semi-preparative HPLCseparation of ketoprofen on Chiralcel AD-H analytical column (dimension 250mm Lx 4.6 mm I.D.) under separation conditions: hexane/IPA (90/10 v/v) as mobile phase,at 25C column temperature, flow rate of 0.8ml/min and UV-Vis detection at 254nm.
7.3.2 Preferential crystallization operation for ketoprofen
Based on the phase diagram of Kp in the chapter 4, if we want to get the pure S
enantiomer, the initial composition of the cooling crystallization should be between
pureSand eutectic composition. At first, three different start compositions (96%, 94%,
and 92% mole percent Sketoprofen) were tried at same cooling process in order to
determine from which one pure Senantiomer products can be obtained. The HPLC
analyzing results for the final crystal products of different initial composition are
shown in Fig. 7.4.
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(a)
(b)
(c)
Fig 7.4 The HPLC analyzing results for the crystal products of different initialcomposition, (a) 92% mole percent (S)-Kp; (b) 94% mole percent (S)-Kp; (c) 96%
mole percent (S)-Kp.
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The first peak in these figures presents theRenantiomer of ketoprofen, while
the second one is S enantiomer. We can see from these HPLC results that the first
peak area was almost negligible compared with the second peak only in Fig. 7.4 c.
That means only final crystal product from 96% mole fraction (S)-Kp initial
composition was almost pure S enantiomer considering the measure error in HPLC
and impurities in products.
It can be explained by the Fig. 7.5 (Lorenz and Seidel-Morgenstern, 2002). If
we want to get the pure (S)-Kp, the system point should locate inside the pure
enantiomer existence region at ending temperature. When start point P cooling to a
lower temperature T2, the pure Senantiomer will come out. Then, The start point at
high temperature, such as T1should be higher than the eutectic point. The bigger the
cooling temperature range, the higher the start point. Generally the start point always
need higher than the eutectic point. Therefore, in this work, the crystallization
operations with start composition of 92% and 94% can not produce the optical pure
ketoprofen, though their start composition was higher than eutectic point.
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(a)
(b)
(c)
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Table 7.1 The optical purity of the final crystal products with different cooling degreefor ketoprofen
Experiment
Optical purity of product
(% Senantiomer) from
HPLC
Cooling degree
Exp 01 99.3
Exp 02 99.2
Exp 03 99.8
WithinTcritWith seeds
Exp 04 96.1 OutsideTcrit
Without seeds Exp 05 92.5
Primary
nucleation
occurred
From these results, the same situation found for mandelic acid in section 6.3.2.1
was observed for ketoprofen. The product crystals were almost pure (S)-enantiomer
when the end temperature was higher than 0.7oC (Exp_01-03), which was saturated
temperature for the (RS)-Kp. In this region, only (S)-Kp is supersaturated. When the
crystallization final temperature was lower than this (RS)-Kp saturated temperature,
(RS)-Kp began to supersaturate which resulted in the product crystals in the form of
mixture of (RS)-Kp and (S)-Kp, for example Exp 04. It may further prove that there is
no selectivity of crystal growth of the pure enantiomer and racemate for a racemic
compound when both (S) and (RS) reach supersaturation. The primary nucleation
occurred in Exp 05 when the solution was cooled to around 0.2oC without seeding.
The products of Exp 05 were not optical pure enantiomer because of the racemic
compound property: no selectivity of nucleation between pure enantiomer and
racemate. All these results prove that the key factor to obtain pure enantiomer
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products in direct crystallization of racemic compound is its solubility characteristic.
Only within the safe supersaturation critical limit, can pure enantiomer crystal
products be obtained from the preferential crystallization with seeding.
For the optimal cooling profile consideration, based on the ketoprofen MSZW
data in chapter 4, the supersaturation should be kept within circa 2oC to avoid
spontaneous nucleation of both its enantiomer and racemate. However, as discussed
before, the supersaturation should be kept lower than it measured under homogenous
condition. So, a suitable critical supercooling chosen for ketoprofen was controlled at
around 0.5-1 oC. The corresponding c should be ca. 0.0015-0.0025g/ml. It is very
narrow feasible supersaturation control range compared with 0.027g/ml for mandelic
acid. It suggests that it is more difficult to control the supercooling for the preferential
crystallization for ketoprofen and the nucleation of enantiomer and racemate of
ketoprofen may be easy to occur. On the other hand, considering the crystal growth
kinetics of the ketoprofen (Eq 5-23), the crystal growth rate should be very small in
order to control the supersaturation level within the chosen narrow range. It means the
batch operation time should be very long which can result in the low efficient for the
whole crystallization operation.
In addition, some researchers (Strhlein et al., 2003) proposed a general design
method for the hybrid process of a chromatographic and a crystallization unit. Theypoint that coupled chromatography and crystallization processes in which both units
contribute to purification are useful and efficient, only if the considered crystallization
system possesses a low eutectic point. But, for the ketoprofen, an unfavorable racemic
compound system, the eutectic point is high about 92% more percent (S)-Kp, which
leads to our crystallization unit should start at very high composition, even as 96%
more percent (S)-Kp in order to obtain the pure desired enantiomer. That situation
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may make the whole coupling process less effective and less economical for the
ketoprofen separation.
7.4 Conclusion
In this chapter, a system preferential crystallization was applied for the
unfavorable racemic compound ketoprofen coupling with the HPLC. The partially
resolved 96% mole percent (S)-Kp was obtained by HPLC collection with semi-preparative column. Then the subsequent direct crystallization started from this initial
composition, which located inside the existence region of pure Senantiomers in the
phase diagram. Based on the solubilities and MSZWs of ketoprofen, the direct
crystallization progression was clearly investigated. The optical purities of the final
crystals product were analyzed by HPLC. It was found that the optical pure product
could be obtained by direct crystallization with seeding within certain safe
supersaturation limit. It may be further proved that there was no selectivity of crystal
growth and nucleation of the pure enantiomer and racemate for a racemic compound.
On the other hand, the supersaturation control is especially critical for the unfavorable
ketoprofen system due to its high eutectic composition and narrow metastable zone
widths, which cause narrow feasible region and more difficulty to control for direct
crystallization. Direct crystallization could be less effective and less economical as an
enantioseparation process for the ketoprofen system.
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Chapter 8
Conclusions and Future work
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8.1 Conclusions
In this present work, the preferential crystallization process itself was studied
for the two racemic compound systems, namely more favorable racemic compound
mandelic acid and unfavorable racemic compound ketoprofen, combining the aspects
of thermodynamics, kinetics, and optimal operation. A systematic preferential
crystallization was studied on solubility, metastable zone, kinetics and supersaturation
control profile to obtain crystal product with good quality.
In Chapter 3, two kind of racemic species, namely mandelic acid and
ketoprofen, were characterized by the various spectroscopic techniques, thermal
analysis, thermodynamic calculation and binary phase diagram. The spectra of FTIR,
Raman and PXRD were different between the pure enantiomer and racemate for the
mandelic acid and ketoprofen, which indicates that the mandelic acid and ketoprofen
both belong to the racemic compound. Through the thermal analysis and calculation,it was found that the G0was negative and the enthalpy of fusion difference between
(RS) and (S) were positive for both of mandelic acid and ketoprofen. Their Tfwere
both far away from -30oC which implies that the racemic species is likely to be a
conglomerate. All these results suggest that the mandelic acid and ketoprofen are in
form of racemic compound. The binary melting phase diagrams were constructed for
the mandelic acid and ketoprofen based on Schrder-Van Laar equation, the
Prigogine-Defay equation and DSC measurements. The calculated results were in
good agreement with the DSC experiment data. The shape of binary phase diagrams
of mandelic acid and ketoprofen both show the typical shape of racemic compound
system, just the more favorable racemic compound system for mandelic acid and
unfavorable racemic compound system for ketoprofen. From the binary phase
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scale chromatography is rapidly moving the emphasis to supercritical fluid
chromatography (SFC).
SFC has two main advantages for preparative separations. One is speed: a
higher production rate can be obtained from a given column since the mobile phase
viscosity is very low and fast, efficient separations can be achieved. The other
advantage is the small quantity of organic solvent used: between 10% and 20% of that
needed for a HPLC separation. This not only decreases the total quantity of solvent
used for the separation, but also makes it easier and faster to recover the products
from the small modifier volumes remaining after condensation from the CO2.
Therefore, Coupling the SFC and preferential crystallization will be suggested for the
racemic compound system in the future.
In addition, the different seeding preparation methods were suggested to be
studied in order to obtain the optimal operation strategy and get the good quality of
final products.
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List of publications
Lu Yinghong and Ching Chi Bun, Physicochemical properties, binary and ternary
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Lu Yinghong and Ching Chi Bun, Investigation on the metastable zone width in
crystallization of ketoprofen, Presented in the RSCE2004 InternationalConference, Bangkok, Dec. 1-3, 2004.
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Lu Yinghong, Ching Chi Bun, Study on crystallization phase diagrams and kinetics
behaviors of ketoprofen, presented in the 2006 AIChE Annual Meeting, San
Francisco, Nov. 12-17, 2006.
Lu Yinghong, Wang Xiujuan and Ching Chi Bun, Application of preferential
crystallization for different types of racemic compounds, Industrial & Engineering
Chemistry Research, Revision submitted.