Doru Vornicescu

One of the main targets in modern dentistry is the prevention of caries. Not only daily nutrition plays an important role, but also the so called “pellicle” on the outer surfaced of teeth, which is mainly formed by saliva proteins. Moreover, numerous bacteria are part of this pellicle, which might cause caries by acidic metabolites.

Graphical Abstract The Front Cover shows a new class of bloody-red sulfur compounds, so called tetrathiaporphyrines, which could be isolated from some wild onions (genus Allium L.). These plants are known as drumstick onions and belong to the subgenus Melanocrommyum. This pigment is formed enzymatically if plant tissue is injured. Now, the colour-giving tetrathiaporphyrine, representing a new class of chemical pigments, could be fully synthesized, using 2-thiocyanato-1H-pyrrole as starting block.