No abstract

We designed and synthesized a donor-acceptor-donor dye consisting of a 2,7-disubstituted fluorenone with diethylaminophenyl moieties present as strong electron donating groups. Switching between twisted intramolecular charge transfer (TICT) emission and excimer emission was achieved, with no ground state changes, by simply changing the solvent used. In a nonpolar solvent, excimer emission was observed; with increasing polarity, the emission gradually disappeared, and the TICT emission appeared.

We examined whether the analytical method of patulin (a mycotoxin found in fruit juice) developed in Nagano prefecture meets the criteria in the Codex Procedural Manual and Guidelines on Analytical Terminology. The trueness, repeatability, within-laboratory reproducibility and HorRat value were 98.8-103.4%, less than 6.4, 8.1 and 0.4%, respectively, for apple juice and pear juice.Thus, the trueness and precision met the required criteria.