2014
DOI: 10.1021/jf5013715
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Tissue and Cellular Localization of Tannins in Tunisian Dates (Phoenix dactylifera L.) by Light and Transmission Electron Microscopy

Abstract: A histological approach including light microscopy and transmission electron microscopy (TEM) was used to provide accurate information on the localization of condensed tannins in the edible tissues and in the stone of date fruits (Phoenix dactylifera L.). Light microscopy was carried out on fresh tissues after staining by 4-dimethylaminocinnamaldehyde (DMACA) for a specific detection of condensed tannins. Thus, whether under light microscopy or transmission electron microscopy (TEM), results showed that tannin… Show more

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Cited by 24 publications
(32 citation statements)
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“…Besides their soluble form, insoluble sediments of these compounds as well as condensed, electron-dense, different-size accretions, the so-called proathocyanins, were observed. A similar location and form of tannins in the fruit pericarp of various species have also been observed by other authors (Hammouda et al 2014 ; Konarska 2013 , 2014b ). Some researchers suggest that tannins can form stable complexes with proteins, carbohydrates, and fats (Jakobek 2015 ) as well as heavy metals, mucilage, and pectins (Ramaswamy et al 2013 ; Zhao et al 2013 ).…”
Section: Discussionsupporting
confidence: 87%
“…Besides their soluble form, insoluble sediments of these compounds as well as condensed, electron-dense, different-size accretions, the so-called proathocyanins, were observed. A similar location and form of tannins in the fruit pericarp of various species have also been observed by other authors (Hammouda et al 2014 ; Konarska 2013 , 2014b ). Some researchers suggest that tannins can form stable complexes with proteins, carbohydrates, and fats (Jakobek 2015 ) as well as heavy metals, mucilage, and pectins (Ramaswamy et al 2013 ; Zhao et al 2013 ).…”
Section: Discussionsupporting
confidence: 87%
“…so-called proanthocyanidins. This type of tannin deposits present in the skin of various fruits has also been reported by other authors (Hammouda et al 2014 ; Tessmer et al 2014 ; Konarska and Domaciuk 2018 ). Phenolic compounds are valuable antioxidants with an ability to chelate metal ions and scavenge free radicals thus enhancing the plant defence mechanism (Sengul et al 2009 ; Karamian and Ghasemlou 2013 ).…”
Section: Discussionsupporting
confidence: 87%
“…Tannins are greatly involved in the bitterness and the astringency of the seeds, the protection against pathogen attacks and the germination mechanisms [40].…”
Section: Discussionmentioning
confidence: 99%