JPH09184761A - Method for calculating coincidence of two spectra - Google Patents

Method for calculating coincidence of two spectra

Info

Publication number
JPH09184761A
JPH09184761A JP7354451A JP35445195A JPH09184761A JP H09184761 A JPH09184761 A JP H09184761A JP 7354451 A JP7354451 A JP 7354451A JP 35445195 A JP35445195 A JP 35445195A JP H09184761 A JPH09184761 A JP H09184761A
Authority
JP
Japan
Prior art keywords
spectrum
data
spectra
unknown
coincidence
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP7354451A
Other languages
Japanese (ja)
Inventor
Juichiro Ukon
寿一郎 右近
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Horiba Ltd
Original Assignee
Horiba Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Horiba Ltd filed Critical Horiba Ltd
Priority to JP7354451A priority Critical patent/JPH09184761A/en
Publication of JPH09184761A publication Critical patent/JPH09184761A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To calculate the degree of coincidence of an unknown spectrum with a known spectrum accurately by obtaining a correlation between the known and unknown spectra at the peak position according to the differential spectrum of the known spectrum and calculating the coincidence of the unkown spectrum with the known spectrum on the basis of its correlation coefficient. SOLUTION: A data around a base line BL is delected, at a constant threshold, from a differential spectrum that is obtained through secondary differntiation of a known spectrum. The data larger than the threshold SL is left as it is, therbey determining the data points of the known and unknown spectra. Then, the known and unknown spectra are regulated so as to be included between zero and one. Further, the data corresponding to the extracted data points are allowed to exit from the regulated spectra. Then, the data of the known spectrum are shown by the horizontal axis, and those of the unknown spectrum are shown by the vertical axis, further the corresponding data are shown on a coordinate system, thereby obtaining points P1 to P6 therefrom. Thus, the correlation coefficient of two spectra data is obtained on the basis of the distribution diagram of the two spectra data.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】この発明は、吸収法や発光法
あるいは蛍光法などによって得られるスペクトルを、既
知のスペクトルと比較し、両スペクトルの一致度を算出
する方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of comparing a spectrum obtained by an absorption method, a light emission method, a fluorescence method or the like with a known spectrum to calculate the degree of coincidence between the two spectra.

【0002】近時、医薬品の確認試験にFT−IR(フ
ーリエ変換赤外分光光度計)が用いられるようになって
きており、構造が類似した医薬品を判別するのに、対象
となる医薬品の測定スペクトルと、予め測定された標準
スペクトルとを照合し、その一致する度合いを算出する
ようにしている。
Recently, FT-IR (Fourier Transform Infrared Spectrophotometer) has come to be used for confirmation test of medicines, and in order to discriminate medicines having a similar structure, measurement of the medicines to be measured. The spectrum and the standard spectrum measured in advance are collated, and the degree of coincidence is calculated.

【0003】[0003]

【従来の技術】例えば、二つの吸光度スペクトルの一致
度を算出する従来の手法として、 二つのスペクトルを0〜1の間で正規化し、対応す
るデータ点における吸光度データの差を加算し、これを
データ点数で割算して得られる値から1を引いて100
を乗じて%表示する方法や、 予め一方のスペクトルの特定ピークを指定してお
き、そのピーク付近のデータ点の吸光度データを、両ス
ペクトルの同一波長のもので縦軸−横軸にプロットし、
それらデータの散布図の相関係数から一致度を求める方
法、などがある。
2. Description of the Related Art For example, as a conventional method for calculating the degree of coincidence between two absorbance spectra, the two spectra are normalized between 0 and 1 and the difference between the absorbance data at corresponding data points is added. 100 is obtained by subtracting 1 from the value obtained by dividing by the number of data points.
Method of multiplying by% and specifying a specific peak of one spectrum in advance, absorbance data of data points near that peak are plotted on the vertical axis-horizontal axis with the same wavelength of both spectra,
There is a method of obtaining the degree of coincidence from the correlation coefficient of the scatter plot of those data.

【0004】[0004]

【発明が解決しようとする課題】しかしながら、上記
の手法においては、ベースラインも処理されるため、こ
のベースラインが傾いていたり、曲がっているような場
合、精度よく一致度を求められないといった不都合があ
る。また、上記の手法は、精度の点では問題がない
が、予めピーク位置を指定しなければならないととも
に、特定ピークによる一致度であり、スペクトル全体に
基づくものでないといった欠点がある。
However, in the above method, since the baseline is also processed, if the baseline is tilted or bent, the degree of coincidence cannot be obtained accurately. There is. Further, although the above method has no problem in terms of accuracy, it has the drawback that the peak position must be specified in advance and the degree of coincidence due to a specific peak is not based on the entire spectrum.

【0005】この発明は、上述の事柄に留意してなされ
たもので、その目的は、ピーク位置を予め指定しなくて
も、2つのスペクトルの一致度を精度よく、簡単に算出
することができる方法を提供することである。
The present invention has been made in view of the above matters, and an object thereof is to accurately and easily calculate the degree of coincidence between two spectra without specifying a peak position in advance. Is to provide a method.

【0006】[0006]

【課題を解決するための手段】上記目的を達成するた
め、この発明の一つの方法は、既知スペクトルと未知ス
ペクトルとの一致度を算出する方法において、既知スペ
クトルを微分し、そのときに得られる微分スペクトルか
らピーク位置を見出し、このピーク位置における既知ス
ペクトルおよび未知スペクトルのデータの相関をとり、
その相関係数に基づいて既知スペクトルに対する未知ス
ペクトルの一致度を算出するようにしている。
To achieve the above object, one method of the present invention is a method of calculating the degree of coincidence between a known spectrum and an unknown spectrum, which is obtained by differentiating the known spectrum. Find the peak position from the differential spectrum, take the correlation of the data of the known spectrum and the unknown spectrum at this peak position,
The degree of coincidence of the unknown spectrum with the known spectrum is calculated based on the correlation coefficient.

【0007】この発明の他の方法は、既知スペクトルと
未知スペクトルとの一致度を算出する方法において、両
スペクトルをそれぞれ微分し、既知スペクトルを微分し
て得られる微分スペクトルからピーク位置を見出し、こ
のピーク位置における既知スペクトルおよび未知スペク
トルの微分値データの相関をとり、その相関係数に基づ
いて既知スペクトルに対する未知スペクトルの一致度を
算出するようにしている。
Another method of the present invention is a method of calculating the degree of coincidence between a known spectrum and an unknown spectrum, where both spectra are differentiated and the peak position is found from the differential spectrum obtained by differentiating the known spectrum. The correlation of the differential value data of the known spectrum and the unknown spectrum at the peak position is obtained, and the degree of coincidence of the unknown spectrum with the known spectrum is calculated based on the correlation coefficient.

【0008】上記いずれの方法においても、ピーク位置
を予め指定する必要がなく、その手間を省くことができ
るとともに、スペクトル全体を一致度を算出しているの
で、精度よく一致度を算出することができる。
In any of the above-mentioned methods, it is not necessary to specify the peak position in advance, the labor can be saved, and the degree of coincidence of the entire spectrum is calculated, so that the degree of coincidence can be calculated accurately. it can.

【0009】[0009]

【発明の実施の形態】以下、この発明の好ましい実施例
を、図を参照しながら説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.

【0010】今、FT−IRを用いて既知物質および未
知物質をそれぞれ分析したときに得られる赤外吸光度ス
ペクトルが図1および図2に示すものであるとし、これ
らの吸光度スペクトルの一致度を算出する場合を例に挙
げて説明する。そして、図1に示す既知物質の吸光度ス
ペクトルを既知スペクトル1とし、図2に示す未知物質
の吸光度スペクトルを未知スペクトル2とする。
Now, assume that the infrared absorption spectra obtained when analyzing a known substance and an unknown substance using FT-IR are those shown in FIGS. 1 and 2, and the degree of coincidence between these absorption spectra is calculated. The case will be described as an example. Then, the absorbance spectrum of the known substance shown in FIG. 1 is set to known spectrum 1, and the absorbance spectrum of the unknown substance shown in FIG. 2 is set to unknown spectrum 2.

【0011】(1)既知スペクトル1を微分する。微分
次数は1次、2次のいずれでもよいが、1次微分の場
合、スペクトルのピークの位置がゼロとなり、後の処理
でデータ点が消える。一方、2次微分を行うとピーク位
置がデータとして残る。そこで、2次微分を行う。既知
スペクトル1を2次微分して得られるスペクトル(微分
スペクトル)3を図3に示す。そして、図4は、この微
分スペクトル3を構成するデータ点を示している(図中
の×印)。
(1) Differentiate the known spectrum 1. The differential order may be first order or second order, but in the case of first order differential, the position of the peak of the spectrum becomes zero and the data points disappear in the subsequent processing. On the other hand, when the second derivative is performed, the peak position remains as data. Therefore, the second derivative is performed. FIG. 3 shows a spectrum (differential spectrum) 3 obtained by second-order differentiating the known spectrum 1. And FIG. 4 has shown the data point which comprises this differential spectrum 3 (X mark in a figure).

【0012】(2)図3に示した微分スペクトル3から
ベースラインBL付近のデータを削除する。この削除
は、一定のしきい値を設定して行う。このしきい値とし
ては、例えば、微分スペクトル3の最大値の10%とし
たり、あるいは、微分スペクトル3の標準偏差としても
よい。図3および図4において、符号SLはこのように
して適宜設定されたしきい値を示し、このしきい値SL
以上のデータ点または絶対値を持つデータ点を残し、こ
の処理によって、既知スペクトル1と未知スペクトル2
とにおけるデータ点が決定される。
(2) Data near the base line BL is deleted from the differential spectrum 3 shown in FIG. This deletion is performed by setting a certain threshold value. The threshold may be, for example, 10% of the maximum value of the differential spectrum 3 or the standard deviation of the differential spectrum 3. In FIGS. 3 and 4, the symbol SL indicates a threshold value set appropriately in this way, and this threshold value SL
The above data points or data points having an absolute value are left, and the known spectrum 1 and the unknown spectrum 2 are processed by this process.
The data points at and are determined.

【0013】(3)既知スペクトル1および未知スペク
トル2を0〜1の値に入るように正規化する。
(3) The known spectrum 1 and the unknown spectrum 2 are normalized so as to fall within a value of 0 to 1.

【0014】(4)前記(2)で抽出したデータ点に対
応するデータを、前記(3)で正規化したスペクトル
(図示してない)から抜き出す。図5(A),(B)
は、このデータ抜き出しによって得られたデータ点(x
0 〜x6 )とデータ(yko〜yk6,yuo〜yu6)を示
し、図5(A)は既知スペクトルのものを、図5(B)
は未知スペクトルのものをそれぞれ示している。
(4) Data corresponding to the data points extracted in (2) above is extracted from the spectrum (not shown) normalized in (3) above. 5 (A), (B)
Is the data point (x
0 ~x 6) and indicates data (y ko ~y k6, y uo ~y u6), FIG. 5 (A) those known spectrum, and FIG. 5 (B)
Indicates the unknown spectra, respectively.

【0015】(5)図5(A)に示す既知スペクトル1
のデータを横軸にとるとともに、図5(B)に示す未知
スペクトル2のデータを縦軸にとり、相対するデータを
その座標系に置く。例えばデータ点x0 における既知ス
ペクトル1のデータおよび未知スペクトルのデータ2
は、yk1,yU1であるから、これらをX座標、Y座標と
することにより、図6において点P1 が定められる。以
下、同様にすることにより、全ての点P1 〜P6 が求め
られる。すなわち、2つのスペクトルデータ1,2の散
布図が得られる。
(5) Known spectrum 1 shown in FIG. 5 (A)
Is plotted on the horizontal axis, the data of unknown spectrum 2 shown in FIG. 5 (B) is plotted on the vertical axis, and the corresponding data is placed on the coordinate system. For example, data of known spectrum 1 and data 2 of unknown spectrum at data point x 0
Are y k1 and y U1 , therefore, the point P 1 is determined in FIG. 6 by setting these as the X coordinate and the Y coordinate. Thereafter, all the points P 1 to P 6 are obtained in the same manner. That is, a scatter plot of the two spectrum data 1 and 2 is obtained.

【0016】(6)前記散布図から2つのスペクトル
1,2のデータの相関係数を求める。この相関係数は、
−1〜+1の値になるが、0〜−1までの場合は、散布
図上のデータが第4象限に配置されることになる。この
例では、元になるデータが全て0〜1のデータであるの
で、相関係数が0以下になることはない。
(6) The correlation coefficient of the data of the two spectra 1 and 2 is obtained from the scatter diagram. This correlation coefficient is
The values are -1 to +1. However, in the case of 0 to -1, the data on the scatter diagram is placed in the fourth quadrant. In this example, since the original data are all 0 to 1, the correlation coefficient never becomes 0 or less.

【0017】(7)前記相関係数が1のときは、図7
(A)に示すように、データは、散布図上で右肩上がり
の一直線上に並ぶことを意味しており、このことは元の
既知スペクトル1と未知スペクトル2の各データ点にお
けるデータが互いに一致していることであり、図1およ
び図2にそれぞれ示されるスペクトル1,2が互いに一
致していることを意味する。したがって、相関係数1を
100%、0を0%として2つのスペクトル1,2の一
致度を算出する(計る)ことができる。図7(B)は2
つのスペクトルが一致してない場合の散布図を示してい
る。
(7) If the correlation coefficient is 1,
As shown in (A), the data means that they are lined up in a straight line on the scatter plot, which means that the data at each data point of the original known spectrum 1 and the unknown spectrum 2 are mutually related. This means that the spectra 1 and 2 respectively shown in FIGS. 1 and 2 are in agreement with each other. Therefore, the degree of coincidence between the two spectra 1 and 2 can be calculated (measured) by setting the correlation coefficient 1 to 100% and 0 to 0%. 7 (B) is 2
The scatter plot is shown when the two spectra do not match.

【0018】ところで、上述実施例においては、散布図
を描く際、既知スペクトル1と未知スペクトル2からデ
ータを採るようにしていたが、これら両スペクトル1,
2をそれぞれ微分して得られる微分スペクトル(図示し
てない)からデータを採るようにしてもよい。その理由
は次の通りである。
By the way, in the above-mentioned embodiment, when drawing the scatter diagram, the data is taken from the known spectrum 1 and the unknown spectrum 2.
Data may be taken from a differential spectrum (not shown) obtained by differentiating each of the two. The reason is as follows.

【0019】スペクトルを微分すると、その微細な構造
が鮮明に現れる。例えば、図1において符号Aで示す部
分は、所謂ショルダーとなっているが、これを2次微分
すると、図3において符号A’で示すように、ピークが
存在することが判る。また、幅の広い吸収帯域も高次の
微分を行うことにより、鋭い吸収帯となる。このことを
利用すると、微分スペクトルによる2つのスペクトルの
一致度の計算結果は、ピーク位置に鋭く依存することと
なり、したがって、わずかなピークシフトも一致度の計
算値に反映されるからである。
When the spectrum is differentiated, its fine structure appears clearly. For example, the portion indicated by the symbol A in FIG. 1 is a so-called shoulder, but when this is second-order differentiated, it is found that a peak exists as indicated by the symbol A ′ in FIG. In addition, a wide absorption band also becomes a sharp absorption band by performing high-order differentiation. By utilizing this, the calculation result of the degree of coincidence between the two spectra by the differential spectrum sharply depends on the peak position, and therefore, even a slight peak shift is reflected in the calculated value of the degree of coincidence.

【0020】この発明は、上述の実施例に限られるもの
でなく、微分の次数は、1次、2次に限られず、3次あ
るいは高次であってもよい。
The present invention is not limited to the above-described embodiment, and the order of differentiation is not limited to first order, second order, and may be third order or higher order.

【0021】[0021]

【発明の効果】この発明は、以上のような形態で実施さ
れ、以下のような効果を奏する。
The present invention is embodied in the above-described embodiment and has the following effects.

【0022】ピーク位置を予め指定する必要がなく、そ
の手間を省くことができるとともに、スペクトル全体を
一致度を算出しているので、簡単でありながらも精度よ
く一致度を算出することができる。
Since it is not necessary to specify the peak position in advance, the labor can be saved, and the degree of coincidence is calculated for the entire spectrum, the degree of coincidence can be calculated accurately even though it is simple.

【0023】この発明は、医薬品の確認試験によって得
られる赤外線吸光度スペクトルの一致度のみならず、広
く2つのスペクトルの一致度を算出するのにも適用でき
ることはいうまでもない。
It goes without saying that the present invention can be applied not only to calculating the degree of coincidence of infrared absorption spectra obtained by the confirmation test of pharmaceuticals but also to widely calculating the degree of coincidence of two spectra.

【図面の簡単な説明】[Brief description of the drawings]

【図1】この発明の一実施例における既知物質の吸光度
スペクトルの一例を示す図である。
FIG. 1 is a diagram showing an example of an absorbance spectrum of a known substance in one example of the present invention.

【図2】この発明の一実施例における未知物質の吸光度
スペクトルの一例を示す図である。
FIG. 2 is a diagram showing an example of an absorbance spectrum of an unknown substance in one example of the present invention.

【図3】図1に示したスペクトルを2次微分して得られ
る微分スペクトルを示す図である。
FIG. 3 is a diagram showing a differential spectrum obtained by second-order differentiating the spectrum shown in FIG.

【図4】前記微分スペクトルを構成するデータ点を示す
図である。
FIG. 4 is a diagram showing data points constituting the differential spectrum.

【図5】抽出したデータ点に対応するデータを示す図
で、(A)は既知スペクトルのものであり、(B)は未
知スペクトルのものである。
FIG. 5 is a diagram showing data corresponding to extracted data points, where (A) is for a known spectrum and (B) is for an unknown spectrum.

【図6】図5(A),(B)を基にして得られた散布図
の一例である。
FIG. 6 is an example of a scatter diagram obtained based on FIGS. 5 (A) and 5 (B).

【図7】散布図における相関係数を説明するための図で
ある。
FIG. 7 is a diagram for explaining a correlation coefficient in a scatter diagram.

【符号の説明】[Explanation of symbols]

1…既知スペクトル、2…未知スペクトル、3…微分ス
ペクトル。
1 ... known spectrum, 2 ... unknown spectrum, 3 ... derivative spectrum.

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 既知スペクトルと未知スペクトルとの一
致度を算出する方法において、既知スペクトルを微分
し、そのときに得られる微分スペクトルからピーク位置
を見出し、このピーク位置における既知スペクトルおよ
び未知スペクトルのデータの相関をとり、その相関係数
に基づいて既知スペクトルに対する未知スペクトルの一
致度を算出するようにしたことを特徴とする2つのスペ
クトルの一致度算出方法。
1. In a method of calculating the degree of coincidence between a known spectrum and an unknown spectrum, the known spectrum is differentiated, the peak position is found from the differential spectrum obtained at that time, and the data of the known spectrum and the unknown spectrum at this peak position are calculated. Is calculated, and the degree of coincidence of the unknown spectrum with the known spectrum is calculated based on the correlation coefficient.
【請求項2】 既知スペクトルと未知スペクトルとの一
致度を算出する方法において、両スペクトルをそれぞれ
微分し、既知スペクトルを微分して得られる微分スペク
トルからピーク位置を見出し、このピーク位置における
既知スペクトルおよび未知スペクトルの微分値データの
相関をとり、その相関係数に基づいて既知スペクトルに
対する未知スペクトルの一致度を算出するようにしたこ
とを特徴とする2つのスペクトルの一致度算出方法。
2. A method of calculating the degree of coincidence between a known spectrum and an unknown spectrum, wherein both spectra are respectively differentiated, a peak position is found from a differential spectrum obtained by differentiating the known spectrum, and the known spectrum at this peak position and A method for calculating the degree of coincidence between two spectra, wherein the differential value data of the unknown spectrum is correlated and the degree of coincidence between the unknown spectrum and the known spectrum is calculated based on the correlation coefficient.
JP7354451A 1995-12-29 1995-12-29 Method for calculating coincidence of two spectra Pending JPH09184761A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7354451A JPH09184761A (en) 1995-12-29 1995-12-29 Method for calculating coincidence of two spectra

Publications (1)

Publication Number Publication Date
JPH09184761A true JPH09184761A (en) 1997-07-15

Family

ID=18437655

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7354451A Pending JPH09184761A (en) 1995-12-29 1995-12-29 Method for calculating coincidence of two spectra

Country Status (1)

Country Link
JP (1) JPH09184761A (en)

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JP2006527381A (en) * 2003-06-10 2006-11-30 オンコログ メディカル キューエイ エイビー Methods and equipment for analysis, confirmation and quality assurance of drugs for injection or infusion
GB2529498A (en) * 2014-05-28 2016-02-24 Chengdu Zhongyuan Qianye Technology Co Ltd Frequency band spectroscopy analyzer
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JPS5895222A (en) * 1981-11-30 1983-06-06 Shimadzu Corp Detection for position of peak wave number in spectrophotometer or the like
JPS6412247A (en) * 1987-07-04 1989-01-17 Ube Industries Analyzer for molecular partial structure
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JP2006527381A (en) * 2003-06-10 2006-11-30 オンコログ メディカル キューエイ エイビー Methods and equipment for analysis, confirmation and quality assurance of drugs for injection or infusion
GB2529498A (en) * 2014-05-28 2016-02-24 Chengdu Zhongyuan Qianye Technology Co Ltd Frequency band spectroscopy analyzer
JP6244492B1 (en) * 2017-05-08 2017-12-06 日本分光株式会社 Spectrum determination apparatus and determination method
JP2018189511A (en) * 2017-05-08 2018-11-29 日本分光株式会社 Spectrum determination device and determination method

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