chemistry

Koichi Tanaka

Koichi Tanaka is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Koichi Tanaka rather than just read about it. In short: Koichi Tanaka (田中耕一, Tanaka Kōichi; born August 3, 1959) is a Japanese electrical engineer who shared the Nobel Prize in Chemistry in 2002 for developing a novel method for mass spectrometric analyses of biological macromolecules with John Bennett Fenn and Kurt Wüthrich (the latter for work in NMR spectroscopy). Early life and education Tanaka was born and raised in Toyama, Japan, his biological mother died one mon…

Key takeaways

Koichi Tanaka belongs to chemistry; place it in that map before memorising details.
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Reproduce the core statement of Koichi Tanaka from memory before moving on to harder problems.

Reference excerpt

Koichi Tanaka (田中耕一, Tanaka Kōichi; born August 3, 1959) is a Japanese electrical engineer who shared the Nobel Prize in Chemistry in 2002 for developing a novel method for mass spectrometric analyses of biological macromolecules with John Bennett Fenn and Kurt Wüthrich (the latter for work in NMR spectroscopy).

Early life and education Tanaka was born and raised in Toyama, Japan, his biological mother died one month after he was born. Tanaka graduated from Tohoku University with a bachelor's degree in electrical engineering in 1983, afterward he joined Shimadzu Corporation, where he engaged in the development of mass spectrometers.

Soft laser desorption

For mass spectrometry analyses of a macromolecule, such as a protein, the analyte must be ionized and vaporized by laser irradiation. The problem is that the direct irradiation of an intense laser pulse on a macromolecule causes cleavage of the analyte into tiny fragments and the loss of its structure. In February 1985, Tanaka found that by using a mixture of ultra fine metal powder in glycerol as a matrix, an analyte can be ionized without losing its structure. His work was filed as a patent application in 1985, and after the patent application was made public reported at the Annual Conference of the Mass Spectrometry Society of Japan held in Kyoto, in May 1987 and became known as soft laser desorption (SLD). The obscure Tanaka had been at the second-lowest rank at Shimadzu when he won the Nobel Prize. The embarrassed company immediately promoted Tanaka to research fellow, and named a laboratory after him. However, there was some criticism about his winning the prize, saying that contribution by two German scientists, Franz Hillenkamp and Michael Karas was also big enough not to be dismissed, and therefore they should also be included as prize winners. This is because they first reported in 1985 a method, with higher sensitivity using a small organic compound as a matrix, that they named matrix-assisted laser desorption/ionization (MALDI). Also Tanaka's SLD is not used currently for biomolecules analysis, meanwhile MALDI is widely used in mass spectrometry research laboratories. But while MALDI was developed prior to SLD, it was not used to ionize proteins until after Tanaka's report.

Blood-based early disease detection

Tanaka Team have developed a diagnostic technology that enables early detection of diseases from a small amount of blood. By artificially modifying antibodies with polyethylene glycol at their base, the arms can move like springs, allowing simultaneous binding to antigens. In experiments with protein fragments related to Alzheimer's disease, the modified antibodies captured antigens more than 100 times more strongly than conventional antibodies. Later improvements enabled glycan analysis from trace mixed samples without peptide selection, leading to the detection of Alzheimer’s-related proteins from 1 mL of blood and the identification of eight previously unknown related substances. This technology is expected to contribute to the early detection of various diseases, including Alzheimer’s disease and prostate cancer. The research originated from work awarded the Nobel Prize in 2002, though the initial methods lacked sufficient sensitivity for medical applications. In 2009, it was selected for the FIRST Program, Development of Next-Generation Mass Spectrometry Systems and Contributions to Drug Discovery and Diagnosis, which provided about 4 billion yen over five years. With a team of around 60 researchers, a breakthrough analytical method was developed within a year, achieving up to a 10,000-fold increase in sensitivity. In November 2011, the team described the results as a technology applicable to early diagnosis and antibody-based drug development, publishing findings in the electronic edition of an English journal issued by the Japan Academy. On August 23, 2012, further results were published in the U.S. journal PLOS ONE in collaboration with Motoharu Seiki of the University of Tokyo Institute of Medical Science. By 2014, the technology had advanced to the stage of detecting Alzheimer’s-related substances directly from blood samples, and since April 2014, efforts under a new framework have been directed toward practical application.

Recognition 1989 – Award of the Mass Spectrometry Society of Japan 2002 – Nobel Prize in Chemistry 2002 – Order of Culture 2002 – Person of Cultural Merit 2002 – Honorary doctorate from Tohoku University 2003 – Honorary citizenship of Toyama Prefecture 2003 – Special Award of the Mass Spectrometry Society of Japan 2006 – Member of Japan Academy 2024 – IEEE Milestone for "LAMS-50K" (one of the 5-member development team)

Illustrations

Worked examples

Example 1 — a first encounter with Koichi Tanaka

Start with the simplest possible case. Write down what Koichi Tanaka claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Koichi Tanaka before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Koichi Tanaka ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Koichi Tanaka

In research: Koichi Tanaka appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Koichi Tanaka in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Koichi Tanaka is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1959 births, Japanese Nobel laureates, Japanese electrical engineers, so understanding it makes those chapters shorter.
In everyday life: Look for Koichi Tanaka outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Koichi Tanaka in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Koichi Tanaka means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Koichi Tanaka out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Koichi Tanaka in simple terms?

Why does Koichi Tanaka matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Koichi Tanaka?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Koichi Tanaka.