Riccardo Samiolo’s scientific contributions

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Publications (2)


Fig. 1 Main specie of chestnut and quebracho tannins
Fig. 2 Powders of CT/PCT and QT/PQT
Fig. 3 1 H NMR (a) and. 13 C NMR (b) of CT and its purified (PCT) and residual fractions (RCT); The chemical structure of gallic acid and glucopyranose structure (c)
Fig. 4 1 H NMR (a) and. 13 C NMR (b) of QT and its purified (PQT) and residual fractions (RQT); The chemical structure of QT and catechin (c)
Fig. 5 FT-IR spectra of CT (left) and QT (right), as well as their purified and residual fractions

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Characterisation and tanning effects of purified chestnut and sulfited quebracho extracts
  • Article
  • Full-text available

September 2024

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105 Reads

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1 Citation

Collagen and Leather

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Riccardo Samiolo

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Vegetable tannins are environmentally friendly tanning agents. However, they generally impart a dark colour to the tanned leather and highly contribute to the organic load in wastewaters. In this study, we employed a purification protocol separately on chestnut tannin (CT) and sulfited quebracho tannin (QT) to obtain the purified fractions (PCT and PQT). These samples were characterised by GPC, ¹H NMR, ¹³C NMR, FT-IR, and HPLC–DAD techniques and applied for tanning tests. Through the purification process, non-tannin components and smaller molecules such as gallic acid, glucopyranose, and catechin were effectively removed from CT and QT, which consequently led to the reduced moisture content, pH value, and lighter colour of purified fractions. The crust leathers processed with PCT and PQT showed desirable light shades. Moreover, the organic loads in PCT and PQT tanning wastewater were reduced by 13.5% and 19.1%, respectively, when compared to those in traditional CT and QT tanning wastewater. Additionally, the physical and mechanical characteristics of crust leathers processed with PCT and PQT were comparable to those processed with CT and QT. Thus, purification of vegetable tannins may serve as a feasible strategy for producing light-colored vegetable-tanned leather while minimizing organic pollutant discharge during the vegetable tanning process. Graphical Abstract Supplementary Information The online version contains supplementary material available at 10.1186/s42825-024-00171-9.

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Citations (2)


... Overall, given the differences b MRE, these results suggest that the macroporous resin effectively co phenol compounds from the CE. Figure S2B) are presented. The 1 H-NMR showed several signals between δ = 4.7-5.7 ppm, which correspond t groups in carbohydrate structures, which indicate the presence of ca in the CE [60]. Also, characteristic aromatic proton signals of the poly ...

Reference:

Macroporous Resin Recovery of Antioxidant Polyphenol Compounds from Red Onion (Allium cepa L.) Peel
Characterisation and tanning effects of purified chestnut and sulfited quebracho extracts

Collagen and Leather

... L eather, in its general definition, is a durable and flexible material with the tanning of animal skins or hides, synthetic productions, and innovative sustainable alternatives (Falkiewicz-Dulík, 2015). The leather industry, one of humanity's oldest activities, is also one of the earliest examples of a circular economy (Facchin et al., 2024). Natural leather and leather products are primarily obtained by tanning the hides of animals such as cattle, sheep, and goats (Jaegler, 2016). ...

May 1,3,5-Triazine derivatives be the future of leather tanning? A critical review

Environmental Pollution