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Response surface and contour plots for the effects of different parameters on Chlorella-Arc polysaccharide yields. (a) Ratio of water to dried microalgae powder and extraction temperature, with the extraction time held constant at 3 h. (b) Ratio of water to dried microalgae powder and extraction time, with the extraction temperature held at 80 °C. (c) Extraction temperature and extraction time, with the ratio of water to dried microalgae powder fixed at 40:1.
