Studies on Valuation Method of Freshness of Fruit Vegetables by Physical Means (II)
Direction to the Bioelectropotential Difference Method
1969 Volume 31 Issue 2 Pages 168-172
Details
1969 Volume 31 Issue 2 Pages 168-172
In order to find the more economical method of evaluating the quality of agricultural products, measuring electrical properties of the products was conducted.
Results obtained by measuring static bioelectro-potential difference (Vc) and bioelectric current (Ac) of cucumber and tomato at harvest and under preservation were as follows.
1. Both measuring at harvest and preservation, the experimental values Vc and Ac of materials had no relation with their to weight, length, and volume. So, it can be said that biophysical-chemical characteristics of quality instead of size and weight were measured.
2. At harvest, for cucumber, an approximate equation between Vc and Ac was
Ac=1/3200Vc2 (Fig·5)
and for tomato, both experimental values Vc and Ac of full riped materials indicated comparatively larger than hard riped.
3. The variances of experimental values Vc and Ac under preservation were shown in Fig. 8 and 9. In the order of storage temperature, peak values marked by (*) stars were observed, and deterioration of quality of external apperance was clearly recognized 0.5 to 2 days after the appearance of the peak. Therefore it is considered that the peak values indicate the internal deterioration of quality.
4. Since there are many unsolved problems in bioelectrics, various studies in chemical analysis, chromatography and simulative method will be required.
