Comparison of Microbial Contamination-Reducing Method of Sand Ginger Powder by Steam Sterilization and Potassium Permanganate Soaking

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Thawatchai Srisuwan
Thaweeporn Keereekoch
Tantisa Putkaew
Wandee Tubwat
Wichanee keereetham
Sanan Subhadhirasakul

Abstract

 The purpose of this research was to study the quality of sand ginger powder by steam sterilization and potassium permanganate soaking. Fresh sand ginger rhizome was divided into 3 groups with the total of 6 treatments. The first group was steam sterilized at 121C for 15 minutes or 115C for 15 or 30 minutes. The second group was soaked in KMnO4 solution at the concentration of 100 or 200 ppm for 60 minutes. The third group was the control group. The finding reveals that steam sterilization of Sand Ginger at 121C for 15 minutes was microbial contamination free. The semples of steam sterilization at 115C for 30 minutes and soaked in KMnO4 solutions at the concentration of 100 or 200 ppm for 60 minutes have been contaminated but have passed the microbial contamination standard criteria of Thai Herbal Pharmacopoeia. Therefore, the method of soaking in KMnO4 solution at a concentration of 200 ppm 60 minutes is the most appropriate method when consider with the cost of production.


 

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