Abstract
The mildew of stored grain will affect the safety of food，which can be monitored by the method of detecting the change of carbon dioxide (CO2) concentration in grain bulk. As an indirect method, it is necessary to analyze comprehensively the related factors of grain bulk and the parameters of CO2 sensor, which cansignificantly affect the detection value. The results showed that the mould count in the initial stage of the stored grain fungi growth was synchronized with the change of CO2 concentration at different temperatures, and the correlation coefficient was greater than 0.99. CO2 production decreased significantly at low temperature, the CO2 produced at 30 ℃ was 4.7 times higher than that at 20 ℃ in the grain bulk of similar mould count. CO2 gas diffusion was significantly affected by grain porosity and other factors. The porosity of rice was 30% higher than that of wheat, but the peak concentration of grain pile at the monitoring point 50 cm from the source of CO2 was 50% higher than that of wheat pile, with 4 days earlier of the peak time. The monitoring point of 3 m below surface of grain bulk ccould reduce the effect of external gas exchange, and the monitoring effectiveness was better than that of the monitoring point with depth of 1 m when mildew position at 1 m or 2 m from grain bulk surface. The gas flow velocity and sampling quantity should be determined in the process of gas detection, and the detection value ccould be significantly reduced when the gas flow velocity exceeded the specified flow rate, and the gas sampling volume should be 1.5 times of the theoretical volume in the pipeline. Therefore, the carbon dioxide detection method by setting parameters reasonably could sensitively monitor the activity of mould in stored grain, and this was practically valuable for high efficiency in preventing and controlling the damage of mould.
Publication Date
9-28-2018
First Page
126
Last Page
130
DOI
10.13652/j.issn.1003-5788.2018.09.026
Recommended Citation
Jingjing, BEI; Huanchen, ZHAI; Shuaibing, ZHANG; Yangyong, LU; and Jingping, CAI
(2018)
"Effect of CO2 method on monitoring mildew of stored grain in warehouse and its main influencing factors,"
Food and Machinery: Vol. 34:
Iss.
9, Article 26.
DOI: 10.13652/j.issn.1003-5788.2018.09.026
Available at:
https://www.ifoodmm.cn/journal/vol34/iss9/26
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