Optimization of hot water extraction conditions for Tricholoma matsutake by response surface methodology

This study was performed to establish optimum extraction condition of Tricholoma matsutake. A central composite design was applied to investigate the effects of independent variables, extraction temperature (X ₁), extraction time (X₂) and water per sample (X₃) on dependent variables such as soluble solids contents (Y₁), total phenolics contents (Y₂), reducing sugar contents (Y ₃), electron donating ability (Y₄) and nitrite scavenging ability (Y₅). The optimum extraction conditions were predicted and monitored by response surface methodology using SAS program based regression analysis. Soluble solids content, electron donating ability and nitrite scavenging ability were highly affected by water per sample. However, the contents of total phenolics and reducing sugar were affected by water per sample and extraction temperature as well. The optimum extraction conditions for soluble solids were 34.84 mL/g (water/sample) at 78.85°C, for 3.33 hr. In contrast, the optimum extraction conditions of electron donating ability were temperature of 91.00°C, time of 1.62 hr and water per sample of 39.42 mL/g. Taken together, the optimum ranges for hot water extraction of Tricholoma matsutake were 70~90°C, 2~4 hr and 30~50 mL/g.