暖冬期における寒天の変敗防止に関する研究-VII

Abstract

In the previous papers1, 2), it was ascertained that the spoilage of “tokoroten” and agar during agar manufacturing in the mild winter results from the use of tainted reed mats in the process of freezing and drying and the disinfection of the reed mats with sodium hypochlorite solution is effective to prevent the spoilage. It is considered by the author that the ordinary reed mat is easily tainted by the causative bacteria, but a plastic mat will not easily be tainted and its employment instead of the reed mat will consequently be effective to prevent the spoilage. The present study was designed to ascertain the effect of the use of a mat made of polyvinyl chloride pipes and vinylon cords in preventing the spoilage of “tokoroten” and agar during agar manufacturing. The results obtained are presented in Tables 2-5 and summarized as follows: (1) The plastic mat is less easily tainted by the causative bacteria than the reed mat and its employment is appreciably effective in preventing the spoilage of “tokoroten” and agar. (2) Though the plastic mat is not easily tainted, it becomes still spoilt in a greater or smaller degree when repeatedly put to use. Therefore, it seems still necessary to disinfect the mat after its use. (3) In view of practical use, some improvements of the plastic mat are suggested.