Abstract
This study was performed to determine optimal extraction conditions of fermented Polygonum multiflorum root by Lentinula edodes (JMI10079) Pegler mycelials using response surface methodology. The independent factors were extraction temperature (X1: 40–100oC), extraction time (X2: 2–10 hrs.), and the ratio of water to sample (X3: 33–100 mg/mL). Their effects were assessed on dependent variables of the extract properties, which included soluble solid contents (Y1), °Brix of sample extract (Y2), total polyphenol content (Y3), total flavonoid content (Y4), 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid) radical cation scavenging activity (Y5) and 2,2-diphenyl-1-picrylhydrazyl radical scavenging activity (Y6). The experimental data obtained were fit to a second-order polynomial equation. The optimal extraction conditions for fermented P. multiflorum root were: X1: 91.22°C, X2: 7.72 hrs, and X3: 39.71 mg/mL.
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