In heat state it circulates and the natural type shelf life improver for the eating and drinking item which is sold, the eating and drinking item, and heat when shelf life has improved it circulates and being the natural type shelf life improver for

摘要

PROBLEM TO BE SOLVED: To provide both a natural keeping quality improving agent extracted from one or more kinds of saponin-containing plants selected from Yucca araborescens, Yucca schidigera or Yucca brevifolia, Sapindus mukurossi or Sapindus saponaria, Aesculus hippocastanum and Asparagus officinalis and capable of inhibiting the germination and proliferation of spores and a food and drink comprising the natural keeping quality improving agent formulated therein and capable of inhibiting the germination and proliferation of the spores remaining and mixed even after a conventional heat treatment and achieving the prevention of deterioration of a flavor, etc., and an improvement in the keeping quality. SOLUTION: This natural keeping quality improving agent is characterized as comprising the germination proliferation inhibitor of the bacterial spores extracted from the one or more kinds of the saponin-containing plants selected from the Yucca araborescens, Yucca schidigera or Yucca brevifolia, Sapindus mukurossi or Sapindus saponaria, Aesculus hippocastanum and Asparagus officinalis as an active ingredient. The food and drink has improved keeping quality. The method for improving the keeping quality of the food and drink is provided.