Google celebrated 133rd birth anniversary of Michiyo Tsujimura, Japanese educator and biochemist whose research focused on the components of green tea, with a Doodle. Tsujimura was the first woman in Japan to receive a doctoral degree in agriculture. Thanks to Tsujimura, and her groundbreaking research into the nutritional benefits of green tea, science today has the answer why green tea tastes so bitter when steeped for too long.
Tsujimura was born on this day in 1888 in Okegawa, Saitama Prefecture, Japan. She spent her early career teaching science. In 1920, she chased her dream of becoming a scientific researcher at Hokkaido Imperial University where she began to analyze the nutritional properties of Japanese silkworms.
A few years later, Tsujimura transferred to Tokyo Imperial University and began researching the biochemistry of green tea alongside Dr. Umetaro Suzuki, famed for his discovery of vitamin B1. Their joint research revealed that green tea contained significant amounts of vitamin C—the first of many yet unknown molecular compounds in green tea that awaited under the microscope.
In 1929, she isolated catechin—a bitter ingredient of tea. Then, the next year she isolated tannin, an even more bitter compound. These findings formed the foundation for her doctoral thesis, “On the Chemical Components of Green Tea” when she graduated as Japan’s first woman doctor of agriculture in 1932.
Outside of her research, Dr. Tsujimura also made history as an educator when she became the first Dean of the Faculty of Home Economics at Tokyo Women’s Higher Normal School in 1950. Today, a stone memorial in honour of Dr. Tsujimura’s achievements can be found in her birthplace of Okegawa City.