WO2006011528A1 - 固体試料の核磁気共鳴測定方法 - Google Patents
固体試料の核磁気共鳴測定方法 Download PDFInfo
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- WO2006011528A1 WO2006011528A1 PCT/JP2005/013764 JP2005013764W WO2006011528A1 WO 2006011528 A1 WO2006011528 A1 WO 2006011528A1 JP 2005013764 W JP2005013764 W JP 2005013764W WO 2006011528 A1 WO2006011528 A1 WO 2006011528A1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/64—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using cyclotron resonance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/44—Arrangements or instruments for measuring magnetic variables involving magnetic resonance using nuclear magnetic resonance [NMR]
- G01R33/46—NMR spectroscopy
- G01R33/4641—Sequences for NMR spectroscopy of samples with ultrashort relaxation times such as solid samples
Definitions
- the present invention uses a receiving coil to excite a nuclear spin of a solid sample placed in a static magnetic field, and receives a FID (Free Induction Decay) signal from the excited nuclear spin.
- the present invention relates to a method of measuring nuclear magnetic resonance of a solid sample by obtaining an IR (Inversion Recovery) -NMR (Nuclear Magnetic Resonance) spectrum by subjecting the FID signal to frequency conversion processing.
- NIR near-infrared spectroscopy
- powder X-ray diffraction method powder X-ray diffraction method
- solid CMR method solid CMR method and the like have been used as physical measurement means for solid samples.
- these measurement methods have problems such as incapability of quantification without reference, high detection limit, signal intensity depending on crystal size, and inability to detect specific crystal forms such as amorphous.
- the proton NMR (PMR) method is widely used as a means for measuring a sample dissolved in a solution.
- protons are advantageous for use in analyzes with high detection sensitivity.
- the PMR method irradiates a proton placed in a static magnetic field with an RF magnetic field, and records the change in the energy of the proton that resonates with the RF magnetic field as an electrical signal.
- the nucleus has a micro magnet (spin magnetic moment). Without a magnetic field! In the environment, the proton spin magnetic moment is in a random direction. When it is placed in a static magnetic field (+ Z direction), the magnetic moment begins to precess Lamour at an angle slightly inclined with respect to the magnetic field axis H0. The angular velocity ⁇ ⁇ is proportional to the magnetic field strength ⁇ 0.
- ⁇ 0 ( ⁇ / 2 ⁇ ) ⁇ 0
- ⁇ is called the gyromagnetic ratio and is a constant unique to nuclides.
- Rotation phase is rose It is a rose and is uniformly distributed in a conical shape.
- an NMR signal a radio wave with the same angular velocity as the precession is irradiated from the X axis.
- the spin group absorbs the energy of the radio wave, and causes Mx and My vector components. If the My component is detected by a receiving coil in the y direction, an NMR signal can be obtained.
- radio wave When the radio wave is a pulse, it is called 90 ° pulse and force, 180 ° pulse irradiation.
- tilt angles such as 90 ° and 180 ° are defined by the angle at which the spin tilts from the + Z direction.
- the tilt angle can be changed by the pulse width (sec) and the pulse intensity.
- the current detected by the receiving coil is called FID (Free Induction Decay). The intensity becomes the maximum when the irradiation pulse is cut off, and decays with time.
- the orbit of the magnetic moment M during the relaxation process records the current intensity induced in the detection coil during 90 ° pulse irradiation, and this measurement method is called the IR method (Inversion Recovery).
- the force (180 °- ⁇ 90 °), which is often used, is measured using a pulse sequence of ⁇ , and is also used for research on the physical properties of compounds and MRI in the medical field.
- T1 is the time when the nuclear spin is in the Z0 direction and returns to the first + ZO direction, which is the spin-lattice relaxation time or longitudinal relaxation time (T1).
- FIG. 7 is a graph of this longitudinal relaxation curve.
- the value of the longitudinal relaxation curve becomes zero after 0.693 Tl (sec) and recovers to the point, and after 5 Tl (sec) it becomes almost saturated.
- T1 Since the value of T1 gives a unique value to the proton environment, it can be used for molecular recognition.
- the value of T1 reflects the intermolecular distance in powders and can be used as information indicating a difference in molecular structure.
- the recorded force FID (Free Induction Decay) signal is the time domain spectrum signal with the horizontal axis being time.
- the FID signal is a force that decays with exp (— / T2). This T2 is called the transverse relaxation time, which also changes in the environment where the protons are placed, and is one of the important pieces of chemical information. .
- Non-Patent Document 1 Journal of American Chemical Society 121, 11554-11557 (1999)
- Non-Patent Document 2 ustralian Journal of Soil Research 38, 665-683 (2000)
- Non-Patent Document 3 Solid State Nuclear Magnetic Resonance 15, 239-248 (2000)
- Non-Patent Document 4 Journal of Chemometrics 13, 95-110 (1999)
- the spectral signal of the FID signal is affected by the protons of the water molecules contained in the solid sample, and other necessary proton signals do not appear clearly.
- the FID signal is a force that has a mixture of signals with multiple transverse relaxation times T2.
- the present invention selectively installs a specific proton in a molecule when a cell is installed in a receiving coil for NMR signals, a solid sample is inserted into the cell, and an IR-NMR spectrum is measured. It is an object of the present invention to provide a method for measuring nuclear magnetic resonance of a solid sample that can be measured.
- the present inventor has noted that if only the NMR signal of a certain range of transverse relaxation time T2 can be captured as the FID signal, proton information at a specific site can be obtained.
- the present invention obtains information on protons at specific sites by analyzing IR-NMR spectra, and measures the abundance ratios of constituents such as crystalline polymorphs and non-crystalline components present in solid samples.
- An object of the present invention is to provide a nuclear magnetic resonance measurement method for a solid sample.
- a pulse for nuclear spin excitation is applied to the solid sample inserted in a cell in a magnetic field, and the sample is read at a later time. After applying the pulse for reading the FID signal, set the reception delay time Dd.
- a 180 degree pulse is often used for the excitation pulse, and a 90 degree pulse is often used for the reading pulse.
- the present invention is not limited to numerical values such as 180 degrees and 90 degrees.
- one reading pulse is used for excitation.
- the first excitation pulse brings the proton energy state into a high energy state. afterwards, As the proton energy level decreases, the NMR signal gradually changes from a negative signal to a positive signal. Eventually the steady state is restored. To observe the return to the steady state, observe the irradiation with the reading pulse after a while after the excitation pulse is applied.
- reception delay time Dd it is desirable to set the reception delay time Dd within the range of 1 to 20 ⁇ sec, particularly within the range of 5 to 20 sec. After about 20 seconds, most proton FID signals disappear, so there is no point in making the reception delay time Dd longer.
- reception delay time Dd is more desirable to set the reception delay time Dd within the range of 10 to 15 sec.
- measured FID signals from protons in the environment can be extracted by selecting FID signal forces from other protons.
- the analysis can easily analyze the crystal polymorph of a solid sample.
- the nuclear magnetic resonance measurement method for a solid sample according to the present invention obtains a plurality of FID signals at different times, and based on the plurality of FID signals, IR / NMR spectra are obtained respectively.
- the longitudinal relaxation curve is obtained by plotting the spectral intensity against the time ⁇ at a specific frequency of the IR-NMR spectrum, and the longitudinal relaxation curve is obtained from a plurality of longitudinal relaxation times. This is a method for estimating the component ratio of each component substance of the solid sample by performing regression analysis assuming that it is the sum of relaxation curves.
- a solid sample to be measured is composed of a mixture of crystalline polymorphs by using the proton longitudinal relaxation time T1 as a value for evaluating the mobility of each constituent component, the component is measured.
- the ratio can be specified.
- the near-infrared spectroscopy (NIR) method derives and analyzes very complex principal components! /, Whereas the analysis target of this method is a mathematical expression that is represented only by the value of the longitudinal relaxation time T1. It is a curve, and its simplicity is no comparison with the NIR method. The component ratio can be obtained even when there is no reference at all.
- the solid crystal polymorph including the amorphous molecule can be quantified with high accuracy without requiring an expensive apparatus.
- the longitudinal relaxation curve is analyzed, for example, by the nonlinear least square method, and the strength coefficient f for each component is obtained.
- the component ratio is expressed as the ratio of these strength factors f.
- the longitudinal relaxation time of each constituent component as well as the constituent component ratio in the solid sample can be obtained simultaneously.
- the actual motion of the magnetic vector of the FID signal observed in the nuclear magnetic resonance measurement method is rotational motion.
- the angle from the observation direction to the first observation point (0th order phase value, PhCO) and the angle from the first observation point to the second observation point (primary order) Phase value, PhCl) is required. Therefore, in the present invention, by adjusting the 0th order phase and the baseline at the same time, the correct 0th order phase is found, and the phase-adjusted FID signal is obtained.
- a correct frequency spectrum can be obtained by Fourier transforming this.
- the obtained frequency spectrum may contain a considerable amount of noise.
- a digital smoothing filter is used for the IR-NMR ⁇ vector, a frequency spectrum from which noise has been removed can be obtained.
- the step of measuring the FID signal it is effective to obtain a frequency spectrum from which noise has been removed by performing smoothing processing on the time axis.
- FIG. 1 is a system configuration diagram of a measuring apparatus for performing a nuclear magnetic resonance measuring method for a solid sample of the present invention.
- FIG. 2 is a longitudinal sectional view showing a sample tube 21 for installing a sample that is a solid powder.
- FIG. 3 is a diagram showing the internal structure of an NMR measurement chamber 29.
- FIG. 4 (a) is a diagram showing the waveform of the high-frequency signal supplied to the receiving coil 7 and the waveform of the received FID signal.
- Figure 4 (b) shows the observed FID signal before phase adjustment.
- FIG. 5 (a) shows the frequency spectrum waveform of the received FID signal when the reception delay time Dd is zero.
- FIG. 6 is a graph of longitudinal relaxation time showing crystal polymorph analysis of arginine powder.
- FIG. 7 is a graph showing a longitudinal relaxation curve derived from one proton.
- FIG. 1 is a block diagram of an NMR measurement apparatus for carrying out the nuclear magnetic resonance measurement method for a solid sample of the present invention.
- the NMR measurement equipment consists of an RF generator 2 that generates a continuous high-frequency signal at a constant frequency (for example, 300 MHz), a pulse programmer that generates a pulse signal for modulation such as 90 ° and 180 °, and a high-frequency signal generated by the RF generator. It has an RF gate 4 that applies pulse modulation to the signal, and an RF power amplifier 5 that amplifies the high-frequency signal modulated in noise to several tens of watts.
- the high-frequency pulse signal amplified by the RF power amplifier 5 passes through the TZR switch 6 and is applied to the receiving coil 7 in the transmission mode.
- the high-frequency pulse signal applied to the receiving coil 7 is irradiated to the sample inserted in the receiving coil 7.
- the RF current induced in the receiving coil 7 due to the proton spin flip of the sample due to the irradiation of the high-frequency pulse signal passes through the TZR switch 6 and passes through the RF-AMP8 and IF-AMP9 in the receiving mode. Enters detector 10.
- This received signal is a time domain FID signal.
- the FID signal phase-detected by the phase detector 10 becomes an audible frequency band signal
- the RF component After passing through the C-AMP 11, the RF component is removed by the low-pass filter 12, and after passing through the AZD change 13, is input to the CPU 14 as a time domain digital signal and stored in a predetermined memory.
- the time domain digital signal stored in the memory of the CPU 14 is Fourier-transformed by the CPU 14 and becomes a so-called NMR vector signal in the frequency domain.
- FIG. 2 shows a sample tube 21 for installing a sample that is a solid powder.
- the sample tube 21 comprises a thick glass tube 22 and a resin cap 23 for closing the entrance.
- a resin cap 23 for closing the entrance.
- tetrafluorinated styrene resin can be used as the resin.
- the cap 23 has a thin hole for moisture to pass through.
- the thin hole is connected to a resin tube connected to a dehydrating agent described later.
- FIG. 3 is a view showing the inside of the NMR measurement chamber 29.
- the NMR measurement chamber 29 is filled with a gas such as air or nitrogen, and a magnetic field H penetrates the measurement chamber vertically.
- the sample tube 21 containing the sample is installed obliquely in the NMR measurement chamber 29.
- a resin tube 24 is inserted into the cap 23 fitted to the sample tube 21.
- the sample tube 21 should be controlled to maintain a constant temperature. All samples to be compared must be measured at the same temperature.
- the upper part of the NMR measurement chamber 29 is used to measure moisture-sensitive samples. Is equipped with a container 27 containing a desiccant. The tip of the resin tube 24 of the sample tube 21 is connected to a container 27 containing this desiccant. This eliminates the formation of hydrates during the measurement period and provides data with less influence of adhering water. Note that the sample tube 21 may be sealed without using a desiccant.
- the sample tube 21 is installed so that the sample comes to the center of the receiving coil 7 wound in a solenoid shape.
- Each terminal of the receiving coil 7 is connected to the capacitor 28 of the tuning circuit board 30 attached to the chamber 29 and the other terminal 31.
- FIG. 4 (a) shows the waveform of the high-frequency signal supplied to the receiving coil 7 and the waveform of the received FID signal.
- the receiving coil 7 is first supplied with a 180-degree pulse signal, whereby the energy state of the proton in the sample becomes a so-called high energy state, and the directions of the magnetic moments all at once in the negative direction. Invert the degree.
- the computer sets the reception delay time Dd and starts accumulating the reception FID signal. Therefore, signals collected from the time when the reception delay time Dd elapses after entering the reception mode are excluded from the accumulation target.
- the reception delay time Dd is fixed during measurement.
- reception delay time Dd is too short, noise may be mixed in the vicinity of the center of the frequency spectrum, and a weak signal may be hidden. For this reason, it is better to set Dd longer. If it is set too long, the signal strength itself becomes weak, so set the value within an appropriate range (for example, 5 to 20 / z sec, preferably 10 to 15 ⁇ sec). This maximizes the ratio of spectral intensity (signal) to unwanted signal (noise).
- the accumulated received FID signal is Fourier-transformed by a computer to form an NMR signal waveform of a frequency domain.
- the NMR signal waveform is output and recorded.
- the pulse sequence of (180 ° ⁇ 90 °) may be applied only once for each lever, or may be repeated n times.
- the time domain digital signal input to the CPU 14 is subjected to Fourier transform as it is.
- the time domain digital signal input to the CPU 14 is n-averaged and then Fourier transformed. .
- the latter is more time consuming, but is preferred because it can eliminate values that are far from the average force by averaging received FID signals.
- a received FID signal waveform with time ⁇ as a variable is obtained.
- the computer performs a Fourier transform on the received FID signal waveform to obtain a frequency spectrum waveform.
- the obtained FID signal may be subjected to a Fourier function such as Exponential or Gaussian having an appropriate strength to remove noise components and then subjected to Fourier transform.
- a Fourier function such as Exponential or Gaussian having an appropriate strength to remove noise components and then subjected to Fourier transform.
- the frequency spectrum obtained by Fourier transform often has a baseline distortion.
- the observed FID signal is a force that looks like that shown in Fig. 4 (b). This is the rotational motion of the magnetization vector observed from one direction, and the actual motion is rotational motion. is there.
- the angle from the observation direction to the first observation point (0th order phase value, PhCO) and the first observation point force to the second observation point (first order phase value, PhC) 1) is required.
- a correct frequency spectrum can be obtained by Fourier transforming this.
- provisional phase adjustment is performed for the FID signal using the first-order phase value specific to the measurement condition and the zero-order phase value that can also set the intensity forces at both ends of the spectrum roughly.
- the first-order phase value used here is an extreme spectral shape change between the range where the aliasing signal is affected and the range where it is not affected by using a vector measured with an appropriate digital filter. This can be determined by adjusting the phase so that it disappears. You can. Once this value is set, the same value can be used as long as the measurement condition (capture condition) is not changed.
- the zero-order phase value is different for each measurement. This can change gradually and continuously even during a series of measurements. Therefore, suppose that precise zero-order phase adjustment is performed for a spectrum in which the primary and secondary phases are adjusted. Precise zero-order phase adjustment is performed simultaneously with obtaining a distorted baseline of the spectrum. The real part of the spectrum whose phase has been adjusted is r, the imaginary part is i, and is corrected from the current state.
- a sin curve baseline considered to be V due to inaccuracy of the signal intensity immediately after the start of capturing can be applied.
- the baseline ba si is
- the baseline term uses many variables, it is difficult to generate errors due to the influence of noise.
- the baseline offset is proportional to the overall signal intensity, there is no change in the results when the longitudinal relaxation curve is analyzed without performing baseline correction.
- the frequency spectrum in which the phase and the like are corrected may still contain a considerable amount of noise.
- an appropriate digital smoothing filter is applied to the frequency spectrum to remove noise.
- Digital smoothing filters that can be used here include FFT, Savitzky-Golay, and moving average. If the FFT filter is used here, it is equivalent to smoothing the time axis spectrum (FID signal). Even if the smoothing process itself is performed when the time-axis spectrum is obtained, it does not matter.
- FIGS. 5 (a) and 5 (b) show examples of the frequency spectrum waveform of the obtained received FID signal.
- Figures 5 (a) and 5 (b) show the frequency spectrum waveform when the reception delay time Dd is 0 in the frequency spectrum waveform of the IR-NMR reception FID signal, and the reception delay time Dd is set to sec. It is a graph which shows the comparison with the frequency spectrum waveform in the case.
- the vertical axis shows the spectrum intensity
- the horizontal axis shows the relative frequency (unit: ppm) based on the proton signal peak (4.5 ppm) of water!
- the four waveforms in FIG. 5 (a) are frequency spectrum waveforms when the reception delay time Dd is zero.
- the leftmost waveform in Fig. 5 (a) and Fig. 5 (b) is 90 ° pulse signal with a pulse width PW of 2 ⁇ sec.
- the second waveform from the left is 90 ° pulse signal with a pulse width PW of 5 For ⁇ sec, left
- the third waveform shows the case when the pulse width PW of the 90-degree pulse signal is 10 ⁇ sec, and the rightmost waveform shows the case where the pulse width PW of the 90-degree pulse signal is 13 sec.
- the pulse width PW is 13 ⁇ sec, it functions most as a pulse signal that rotates the proton spin by 90 degrees, so the rightmost waveforms in Figs. 5 (a) and 5 (b) are shown below. Pay attention to the explanation.
- FIG. 5 (a) no spectral waveform other than unnecessary protons such as water appears remarkably at any time ⁇ . In other words, most of them are signals of protons in water near Oppm. However, in Fig. 5 (b), a spectral waveform with a peak at a frequency other than the proton of water appears on the left and right of the NMR ⁇ vector of protons in 1S water.
- ⁇ is plotted on the horizontal axis, and the spectrum intensity is plotted on the vertical axis to create a longitudinal relaxation curve.
- the longitudinal relaxation curve of the selected proton is sometimes referred to as a “selected longitudinal relaxation curve”.
- the selected longitudinal relaxation curve has a different slope from the longitudinal relaxation curve of water protons, and can be distinguished from the longitudinal relaxation curve of water protons.
- the measured solid sample is a mixture of a plurality of component substances having different crystal forms.
- the protons of each component substance have different longitudinal relaxation times T1.
- the selected longitudinal relaxation curve is composed of a linear sum of a plurality of longitudinal relaxation curves with different T1
- fitting is performed using a regression curve, and a plurality of longitudinal relaxation curves constituting the selected longitudinal relaxation curve are formed.
- the value of T1 and the composition ratio can be automatically obtained.
- the regression analysis method of the present invention will be described in more detail.
- the signal intensity corresponding to the variable waiting time ( ⁇ ) is plotted to obtain the selected longitudinal relaxation curve.
- the “specific frequency” it is desirable to use a frequency that maintains a certain degree of strength in the vicinity of Oppm as described above and is less affected by water signals and other noises.
- the signal strength integral value in a specific frequency range can be used instead of the signal strength at a specific frequency. In this case, it can be considered that the smoothing process has been applied here.
- the obtained selection longitudinal relaxation curve is regarded as the sum of components having respective T1 values, and regression analysis is performed to determine the abundance ratio of each component.
- the formula used in this case is [0060] [Equation 1]
- the second term is a constant term that does not depend on time. You may do arithmetic.
- each component can be calculated with a certain degree of accuracy even if calculation is performed for only one sample.
- the T1 value and abundance ratio of the component can be obtained.
- the longitudinal relaxation times T1 of each component are similar, or if the sample has few specific components, the error will increase.
- the nonlinear least-squares analysis is performed on multiple samples containing common components. In this way, the accuracy of the T1 value of each component can be increased, and the abundance ratio can be measured with high accuracy.
- the measurement was performed with an INOVA300 NMR measuring apparatus manufactured by Norian. Arginine was used as a sample.
- FIG. 6 is a graph of longitudinal relaxation time showing crystal polymorph analysis of arginine powder.
- the vertical axis is The signal intensity and the horizontal axis represent the time (logarithm) from the end of applying the 180 ° pulse to the start of applying the 90 ° pulse.
- a is a crushed product of arginine raw powder ground in a mortar
- b is a sample of 70% crushed product added to the arginine raw powder
- c is a sample of 50% crushed product added to the arginine raw powder
- d is A sample of 20% pulverized product added to arginine raw powder
- e is a graph of arginine raw powder.
- Each graph is based on the sum of FID signals of these components having different relaxation times.
- These powder samples contain three types of arginine crystal, arginine amorphous, and aggregate.
- the longitudinal relaxation time T1 of the arginine crystal is Tla
- the longitudinal relaxation time T1 of the arginine amorphous is Tlb
- the longitudinal relaxation time of the aggregate is Tic.
- Signal strength Gtotal is
- fa, fb, and fc are component ratios.
- a plurality of equations can be formed. Since simultaneous equations with Tla, Tib, Tic, fa, fb, and fc as unknowns can be obtained, Tla, Tib, Tic, fa, fb, and fc can be obtained by solving these simultaneous equations. Needless to say, the more measurement points, the higher the accuracy because statistical methods such as nonlinear least squares and maximum likelihood estimation can be used.
- Indomethacin was used as a sample. Indomethacin purchased Wako Pure Chemical Industries reagent for biochemistry. Based on this, samples were prepared by the following seven methods.
- Indomethacin lg was dissolved in Et20 (Jetyl ether) (50 ml) while warming. Undissolved crystals were removed by filtration, and the filtrate was allowed to stand at room temperature. Three days later, the precipitated crystals were collected by filtration, washed with Et20, and dried under reduced pressure.
- Crystals were deposited in the same manner as Sample 3. What was incapable of stirring was kept stirring with a magnetic stirrer. At first it was impossible to stir, but gradually changed to a stirrable state. After stirring at room temperature for 18 hours, the crystals were collected by filtration, washed with 50% EtOH, and dried under reduced pressure.
- a part of the crystal obtained in Sample 3 was pulverized in an agate mortar to obtain a pulverized product.
- a part of the crystal obtained in Sample 4 was pulverized in an agate mortar to obtain a pulverized product.
- the inserted reagent was used as it was.
- the shim was adjusted using another NMR tube containing CDC13 to the same height as the sample, and the target sample was set on the probe. Measurements were taken with SWEEP OFF, SPIN OFF, and LOCK OFF. The sample temperature was adjusted to 23 ° C using a temperature controller. Measured with the following parameter values using the tlir pulse program provided by Bruker as standard! The time axis spectrum (FID signal) was obtained.
- the time axis spectrum obtained above was subjected to Fourier transform ( ⁇ 2) with the following parameter values, and a frequency spectrum was obtained at each time ⁇ .
- PhCO -99.56 (Value where the intensity at both ends of the spectrum is almost the same. Different values for each measurement.)
- PhCl 130 (DigMod: Value similar to the spectrum measured with Digital. Always constant.
- this spectrum is a two-dimensional NMR spectrum consisting of spectra corresponding to each waiting time ( ⁇ )
- split2D is performed, and the real part and imaginary part of the one-dimensional spectrum corresponding to each waiting time ( ⁇ ) are calculated. Obtained.
- These one-dimensional spectrum data were copied from the measurement computer to the data processing computer.
- 0 is the value of the axes arranged on the high wave number side from the low wave number side.
- the baseline we used the sin curve baseline due to the inaccuracy of the signal intensity immediately after the start of acquisition.
- the PhCO value is observed to change gradually and continuously according to the measurement order, but it is affected by noise and fluctuates. In particular, there will be large fluctuations in the vicinity where the signal strength is weakened.
- the signal intensity of the X-axis value 7000 (equivalent to 38.72ppm in frequency) of the frequency spectrum was plotted against each waiting time ( ⁇ ) to obtain a longitudinal relaxation curve.
- Table 4 shows the calculation results of the estimated values of the coefficient fi and the constant C.
- Table 5 shows the standard error calculation results for coefficient fi and constant C.
- a ⁇ 95% confidence interval was determined at the same time.
- the component ratio of the solid crystalline polymorph of indomethacin could be determined with high accuracy.
- the longitudinal relaxation time of each component could be measured simultaneously.
- Glycine was used as a sample. As for glycine, Wako Pure Chemical Industries special grade was used. Based on this, samples were prepared by the following eight methods.
- a part of the crystal obtained in Sample 2 was pulverized in an agate mortar to obtain a pulverized product.
- the purchased reagent was pulverized in an agate mortar to obtain a pulverized product.
- the inserted reagent was used as it was.
- the shim was adjusted using another NMR tube containing CDC13 to the same height as the sample, and the target sample was set on the probe. Measurements were taken with SWEEP OFF, SPIN OFF, and LOCK OFF. The sample temperature was adjusted to 23 ° C using a temperature controller. Measured with the following parameter values using the tlir pulse program provided by Bruker as standard! The time axis spectrum (FID signal) was obtained.
- the time axis spectrum obtained above was subjected to Fourier transform ( ⁇ 2) with the following parameter values to obtain a frequency spectrum.
- PhCO -0.64 (value where the intensities at both ends of the spectrum are almost the same. Different values for each measurement o)
- PhCl 130 (A value that is similar to the spectrum measured with DigMod: Digital. Always constant.)
- this spectrum is a two-dimensional NMR spectrum consisting of spectra corresponding to each waiting time ( ⁇ )
- split2D is performed, and the real part and imaginary part of the one-dimensional spectrum corresponding to each waiting time ( ⁇ ) are calculated. Obtained.
- These one-dimensional spectrum data were copied from the measurement computer to the data processing computer.
- the real part (r) of the frequency spectrum adjusted with the correct 0th-order phase value is PhCO as the 0th-order phase value to be corrected from the current state.
- the glycine frequency spectrum (b) measured separately was used as the baseline.
- the coefficients PhCO, A, and ⁇ were determined by the nonlinear least square method so that r and b coincided with each other in the range of X-axis values 1 to 2048 and 14336 to 16384.
- the total PhCO change was corrected so as to continuously change to PhC0 (cor rected), and this value was used to obtain an adjusted frequency spectrum of the 0th order phase.
- the obtained frequency spectrum was denoised by applying a 191points FFT smoothing filter.
- Table 9 shows the calculated values of the estimated value and standard error of the longitudinal relaxation time Si.
- Table 10 shows the calculation results of the estimated values of the coefficient fi and the constant C. [0102] [Table 10]
- Table 11 shows the standard error calculation results for coefficient fi and constant c.
- a ⁇ 95% confidence interval was determined at the same time.
- the component ratio of the solid crystalline polymorph of glycine could be determined with high accuracy. It was also possible to simultaneously measure the longitudinal relaxation time of each component along with the component ratio.
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Priority Applications (11)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP05767295A EP1772741B1 (en) | 2004-07-29 | 2005-07-27 | Solid sample nuclear magnetic resonance measuring method |
PL05767295T PL1772741T3 (pl) | 2004-07-29 | 2005-07-27 | Sposób pomiaru próbki substancji stałej techniką magnetycznego rezonansu jądrowego |
AT05767295T ATE472111T1 (de) | 2004-07-29 | 2005-07-27 | Festproben-kern-magnetresonanzmessverfahren |
CN2005800257344A CN1993629B (zh) | 2004-07-29 | 2005-07-27 | 固体试料的核磁共振测定方法 |
JP2006527830A JP4555294B2 (ja) | 2004-07-29 | 2005-07-27 | 固体試料の核磁気共鳴測定方法 |
DK05767295.8T DK1772741T3 (da) | 2004-07-29 | 2005-07-27 | Fastprøve-kernemagnetisk resonansmålemetode |
CA2572814A CA2572814C (en) | 2004-07-29 | 2005-07-27 | Nuclear magnetic resonance measuring method for solid samples |
DE602005021969T DE602005021969D1 (de) | 2004-07-29 | 2005-07-27 | Festproben-kern-magnetresonanzmessverfahren |
US11/658,468 US7804298B2 (en) | 2004-07-29 | 2005-07-27 | Nuclear magnetic resonance measuring method for solid samples |
SI200531105T SI1772741T1 (sl) | 2004-07-29 | 2005-07-27 | Postopek za merjenje jedrske magnetne resonance vzorca trdne snovi |
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KR101339040B1 (ko) * | 2012-02-08 | 2013-12-09 | 한국외국어대학교 연구산학협력단 | Lcd 패널의 구조분석을 위한 고체 nmr 프로브 |
KR101423202B1 (ko) * | 2013-02-19 | 2014-07-25 | 주식회사 그린솔루스 | 센싱 장치 |
EP2989478B1 (en) * | 2013-04-23 | 2023-02-15 | Koninklijke Philips N.V. | Single coaxial interface for magnetic resonance (mr) coils |
KR101996666B1 (ko) | 2016-05-02 | 2019-07-04 | 주식회사 엘지화학 | 정량 분석 방법 |
KR101898168B1 (ko) | 2016-05-02 | 2018-10-04 | 주식회사 엘지화학 | 가황 고무 내 황 가교 결합 길이의 분석 방법 |
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EP1772741B1 (en) | 2010-06-23 |
ATE472111T1 (de) | 2010-07-15 |
PT1772741E (pt) | 2010-07-21 |
KR20070030300A (ko) | 2007-03-15 |
EP2166368A1 (en) | 2010-03-24 |
KR100864561B1 (ko) | 2008-10-20 |
JP4555294B2 (ja) | 2010-09-29 |
SI1772741T1 (sl) | 2010-10-29 |
US7804298B2 (en) | 2010-09-28 |
PL1772741T3 (pl) | 2010-11-30 |
CN1993629A (zh) | 2007-07-04 |
DE602005021969D1 (de) | 2010-08-05 |
ES2347053T3 (es) | 2010-10-25 |
CY1110768T1 (el) | 2015-06-10 |
DK1772741T3 (da) | 2010-10-11 |
US20090033325A1 (en) | 2009-02-05 |
EP1772741A1 (en) | 2007-04-11 |
HK1104086A1 (en) | 2008-01-04 |
JPWO2006011528A1 (ja) | 2008-05-01 |
EP1772741A4 (en) | 2008-12-31 |
CA2572814C (en) | 2012-10-02 |
CA2572814A1 (en) | 2006-02-02 |
CN1993629B (zh) | 2010-09-15 |
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