Amounts (mg·g−1 GAE) of total phenolic content of edible algal products after
various extraction processes: (1)—extraction by distilled water (80 °C for 10 min in water
bath with constant shaking); (2)—extraction by methanol-water-acetic acid (30:69:1, v/v/v)
(70 °C for 50 min in water bath with constant shaking); (3)—extraction by 80% methanol
(70 °C for 1 h in water bath with constant shaking); (4)—extraction by 70% acetone (30 °C
for 30 min in water bath with constant shaking); (5)—extraction by 100% methanol (lab
temperature ≈ 23 °C for 24 h, constant shaking). Results are shown as mean ± SD (n = 4).