Isolation, fractionation and characterization of melanin-like pigments from chestnut (Castanea mollissima) shells

Journal of Food Science
Zengyu YaoLihua Wang

Abstract

Melanins are known as versatile biopolymers, but the utilizations are restricted by their poor solubilities. Therefore, well soluble ones or their analogs are much desired. In this article, a new procedure was developed for fractionation of the pigments isolated from chestnut (Castanea mollissima) shells, and 3 fractions (Fr. 1, Fr. 2, and Fr. 3) were obtained. The solubilities of all the fractions in waters of different pH and in common organic solvents were studied. The physicochemical properties of the fractions were characterized for the first time on the basis of combined chemical analyses and spectroscopic methods including ultraviolet-visible (UV-Vis), Fourier transform infrared (FT-IR), electron spin resonance (ESR), and solid-state ¹³C nuclear magnetic resonance (¹³C-NMR). All the fractions could be bleached by NaOCl and H₂O₂ and give a positive reaction for polyphenols, which are usually used as typical tests for allomelanins. Their UV-Vis, FT-IR, and ESR spectra resembled those of synthetic and some natural melanins. Elemental data and quantitative analyses of ¹³C-NMR spectra revealed that pigment-bound proteins and polysaccharides were the most abundant in Fr. 1, while Fr. 2 was presented with the highest aromaticit...Continue Reading

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Citations

Jun 21, 2014·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Jianwei ZhangChao Ma
Apr 5, 2016·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Zeng-Yu YaoYing Wang
Dec 3, 2013·Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association·H ZhangX Sun
Apr 26, 2016·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Zeng-Yu Yao, Jian-Hua Qi
Aug 16, 2019·International Journal of Molecular Sciences·Ioana-Ecaterina PraleaCristina-Adela Iuga
Jan 30, 2016·Zeitschrift Für Naturforschung. C, a Journal of Biosciences·Yong-Qiang ZhangJin-Xiang Luo
Jul 14, 2020·Frontiers in Plant Science·Anastasiia Y GlagolevaElena K Khlestkina
Jul 3, 2021·Materials·Patrycja BrudzyńskaMichel Grisel
Oct 5, 2021·ACS Omega·Abraham Arizmendi-GrijalvaRamón Iñiguez-Palomares

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