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Research paper−35−Synthesiology - English edition Vol.4 No.1 pp.35-44 (Sept. 2011) Raman and ESR spectra have been discontinued. Currently, activities on four kinds of spectral data of MS, IR, 1H NMR, and 13C NMR have been continued along with the management of compound information, and these spectral data and chemical information are disclosed to the public[2].In 1997, we started to release the database contents to the public through the Web[3] by a project of the former Agency of Industrial Science and Technology[4]. The total number of compounds and spectra disclosed as of April, 2010 is about 33,000 and about 100,000, respectively. Figure 1 shows the number and fraction of each spectrum. The main users of the present spectral database are those who access through the Web. Since the database has been disclosed to the public through the Internet, it has had many accesses. The average number of page views per day during the last three years exceeds 100,000 times, which is exceptionally high 1 IntroductionThe reliable analysis of chemical substances is required not only in industry but also in various situations in society. The nuclear magnetic resonance (NMR), the infrared (IR) and the mass spectroscopy (MS) give powerful and essential information in the identification of an organic compound. The measurements and the analyses of spectra need to be performed whenever a new chemical is developed, unknown materials are analyzed or chemicals are identified.In general, identification of a material from spectra by comparing and matching with those obtained as a standard spectral data is one of the most reliable methods. Since this approach has been used in a variety of applications, the role of such standard data and their database is important. Spectral database system for organic compounds, i.e. SDBS, of the National Institute of Advanced Industrial Science and Technology (AIST) was started in 1982 as a project of the former Agency of Industrial Science and Technology. Since the start of this database project, two basic concepts of 1) collection of standard spectral data that are reliable and 2) compilation of more than two kinds of spectra for each compound have been maintained. In other words, its basic concepts are acquisition of as many as six spectral data of MS, 13C NMR, 1H NMR, IR, Raman and electron spin resonance (ESR) spectra for a compound by ourselves (AIST), and management and maintenance of the associated chemical information for the compound[1].During almost 30 years of the database activity, collection of - Key to the continual services and success of a large-scale database-Takeshi Saito* and Shinichi KinugasaNational Metrology Institute of Japan, AIST Tsukuba Central 3, 1-1-1 Umezono, Tsukuba 305-8563, Japan *E-mail : Original manuscript received August 10, 2010, Revisions received October 12, 2010, Accepted November 2, 2010The research activities of spectral database for organic compounds (SDBS) in AIST started in 1982. Since then, many parts of research activities have changed while the other parts have remained unchanged for almost 30 years. The unchanged parts since the start of this project are the two principles that the spectral data with high authenticity should be compiled in the database as the standard data and that several kinds of different spectra should be compiled for each compound, and the concept that compounds used commonly in industry and society are objects of compilation. On the other hand, the computer system used for database management and the ways for data release has changed completely over time. After the data have come to be opened to the public through the Internet, we have started to take considerations of comments, requests and indications from users. SDBS has had innumerable Internet accesses from many researchers, engineers, educators and students from all over the world. In this paper, the total framework, the structure of the database, the method for its data compilation and the ways to release the data to the public are described with analysis and clues of long time continuance and success of SDBS activities.Development and release of a spectral database for organic compoundsKeywords : Spectrum, database, nuclear magnetic resonance, infrared, mass, chemical information, web[Translation from Synthesiology, Vol.4, No.1, p.26-35 (2011)]1H NMR: 15 218 spectra13C NMR: 13 457 spectraIR: 52 132 spectraRaman: 3 575 spectraMS: 24 454 spectraESR: 1 999 spectraFig. 1 Fractions and the number of spectra open to the public by the spectral database for organic compounds (SDBS) of AIST as of April, 2010

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