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. 2016 Nov 9;65(2):105–116. doi: 10.1369/0022155416677035

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Figure 5. — Histochemical analyses for detection of polyphenols and flavanols in stems of Miconia albicans fixed or postfixed in caffeine and sodium benzoate, previous to embedding in PEG (T4, T5). T4: Material fixed in caffeine and sodium benzoate, embedded in PEG, sectioned, and submitted to histochemical reactions. T5: Material fixed in Karnovsky’s solution, postfixed in caffeine and sodium benzoate, embedded in PEG, sectioned, and submitted to histochemical reactions. The vanillin/hydrochloride acid tests show false-negative results in T4 and T5. Scale bars: 50 µm. Abbreviations: PEG, Polyethylene glycol; DMACA, p-dimethylamino-cinnamaldehyde; pi, pith; mb, medullary bundle.