Functionality Analysis of Spent Coffee Ground Extracts Obtained by the Hydrothermal Method

Table 1

Comparative total flavonoid contents in SCG obtained by using various extraction methods.

Extraction conditions	Total flavonoid content (mg QE/g SCG)	References
Hydrothermal method (5 g SCG/35 mL, 150°C, 3 h)	29 ± 4.5	Present study
Hydrothermal method (1 g SCG/20 mL, 120°C, 20 min)	8.29	[19]
60% methanol (1 g SCG/40 mL, 90 min)	1.81	[1]
60% ethanol (2 g SCG/100 mL, 60°C, 30 min)	5.01∼8.03	[20]
Ultrasound-assisted extraction (1 g SCG/17 mL ethanol, 40°C, 40 min)	5.04	[21]