Table 2.

Cinnamon oil synergy with organic acids on solid PDA.

		Cinnamon Oil
		1/2 MIC	1/4 MIC	1/8 MIC	1/16 MIC
Acetic Acid	1/2 MIC	++	++	+	+
	1/4 MIC	++	+	+	+
	1/8 MIC	++	+	+	+
	1/16 MIC	++	+	+	+
Butyric Acid	1/2 MIC	++	++	++	+
	1/4 MIC	++	+	+	+
	1/8 MIC	++	+	+	+
	1/16 MIC	++	+	+	+
Propionic Acid	1/2 MIC	++	++	++	+
	1/4 MIC	++	+	+	+
	1/8 MIC	++	+	+	+
	1/16 MIC	++	+	+	+

Note: Each combination’s rating was based on its level of inhibition: “++” indicates complete inhibition; “+” indicates partial inhibition. The lowest concentration for a combination that received the “++” rating was designated its combined MIC. Dilutions were based on the full MICs of each compound: cinnamon (8000 µL/L air), acetic acid (1500 mg/kg), butyric acid (1760 mg/kg), propionic acid (2222 mg/kg).