Table 1. Analytical data for the Chinese herbal kombucha stock solution.

Test sample	Test result	Tolerable values according to the Chinese standards for agricultural microbial agents (GB 20287-2006)
pH value	2.75
Salmonella	Not detected	Not detected; see the animal feed requirements specified in Chinese Standard GB 13078-2001
E. coli	< 30↑/100mL	< 100↑/mL
Yeast	4.9 x 106/mL	≥ 2.0 x 108 / mL. It is required that the effective number of viable cells for each active microbial species be greater than 1.0 x 106 mL−1 .
Acetic acid bacteria	4.7 x 105 cfu/mL	See Chinese Standard GB 20287-2006 on agricultural microbial agents
Mercury	Not detected	≤ 0.1 mg/kg
Lead	Not detected	≤ 5.0 mg/kg
Arsenic	Not detected	≤2.0 mg/kg
Other heavy metals	Not detected	≤ 0.5 mg/kg