Table 1 The four factors with three levels for orthogonal test.

From: Simultaneous detection of five flavoring agents in chewing gum by ultrasound-microwave synergistic extraction coupled with gas chromatography

Levels

Factors

A

(Solvent)

B

(Solid-liquid ratio g:mL)

C

(Microwave power/W)

D

(Extraction time/min)

1

Ethanol

1:10

300

10

2

Ether

1:15

400

15

3

Petroleum ether

1:20

500

30

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