. The extinction coefficient was determined from the extinction change at 405 nm caused by 1 M gluconic acid under standard conditions. A molar extinction coefficient of 211 M−1 cm−1 was calculated.
. The extinction coefficient was determined from the extinctionchange at 405 nm caused by 1 M gluconic acid under standard conditions. A molarextinction coefficient of 211 M−1 cm−1 was calculated.