Dear Colleagues,

Sulfur-containing products contribute significantly to natural chemical diversity and allow fundamental biological functions that no other compounds allow. Natural sulfur compounds are utilized by all living beings and are distributed in the different kingdoms depending on their role. Marine organisms are one of the most important sources of sulfur-containing natural products since most of the inorganic sulfur is metabolized in ocean environments where this element is abundant. Terrestrial and marine organisms such as plants and microorganisms are also able to incorporate sulfur into organic molecules to produce primary metabolites (e.g., methionine, cysteine) and more complex unique chemical structures with diverse biological roles (e.g., glucosinolates, ergothioneine, ovothiols). Animals are not able to fix inorganic sulfur into biomolecules and are completely dependent on preformed organic sulfurous compounds to satisfy their sulfur needs. However, some higher species such as humans are able to build new sulfur-containing chemical entities starting especially from the organosulfur precursors of plants. The aim of this Special Issue is to provide fundamental and new research works on sulfur compound separations at the preparative and analytical scale as well as new findings in bioactive natural sulfur products.

Dr. Antonio Francioso
Guest Editor

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• Natural sulfur compounds
• Chromatography
• Extraction, isolation and purification
• Preparative and analytical separations
• Bioactive sulfur products