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Spectrophotometric UV-visible analysis of “oxidation-free” reference extract (CRYO) (a) diluted with distilled water (CRYO + 1,620 μL and CRYO + 8,600 µL) until it reached the same maximum of (b) cryoground + 5 min air exposed (CRYO + 5) and (c) cryoground + 30 min air exposed (CRYO + 30). Name of extracts in the legends are ordered in descendent intensity of maximum absorbance (between 318 and 323 nm).
