昭和初期和紙の褐色斑からの真菌分離および蛍光に関する報告

摘要

上記の結果から，微生物起因であるfoxingの由来にも大別して以下のような場合があると 推測される。 ①菌体（菌糸・胞子）が生育時から褐色を呈している ②菌体は褐色を呈していないが，菌体あるいは代謝物が経年により褐色に変化するしたがって，真菌の発生以降，その跡が変色を引き起こす過程で褐色を呈するのは，アミ ノ・カルポニル反応の一種であるメイラード反応だと指摘されているが6），今後は，真菌発生 の予防だけでなく，発生した真菌の痕跡が褐変する諸条件を解明することで，其菌発生後の変 色を予防する対策を視野に入れて検討していきたい。%Microbiological deterioration is one of the major causes of the foxing formation. We observed the fluorescence of foxing spots on a series of Japanese paper made in the early Showa period. Brown spots were coincident with fluoresce spots, but the area of fiuoresce spots were bigger than that of brown spots under irradiation of black light.rnWe isolated Aspergillus penicilloides from the foxing spot with DG18 plates, and inoculated the fungal strain on sterilized paper (Watman and Japanese kozo paper). Aspergillus penicilloides, which has colorless hyphae, non-brown spores and non-brown metabolite was grown on these paper in 25℃ and Aw 0.85 in two months. These spots fluoresced under the irradiation of black light but were not brown. These facts may show that these foxing spots were not brown at the early stage of the growth of the fungi. On the other hand, Eurotium herbariorum, considered as one of fungi which cause foxing, makes brown hyphae and yellow ascocarps in the same conditions. It is necessary to clarify the conditions that make browning reaction with non-brown fungal body and metabolite of Aspergillus penicilloides.