19F MRI is a promising method of diagnosis that can complement the commonly used 1H MRI with gadolinium contrast agents. Copolymers containing fluoroorganic groups demonstrate many advantages as potential 19F MRI contrast agents. In this work, a series of copolymers based on 2,2,2‐trifluoroethyl methacrylate (TFEMA), 1,1,1,3,3,3‐hexafluoroisopropyl methacrylate (HFiPMA), 2‐(dimethylamino)ethyl methacrylate (DMAEMA), or 2‐hydroxyethyl methacrylate (HEMA) units are prepared using atom transfer radical polymerization. The highest S/N values in a 19F NMR spectra is achieved with a copolymer containing 15–25 wt% TFEMA or 18–22 wt% HFiPMA. Copolymers of HFiPMA show a strong effect of pH on T1 and T2 relaxation times while only T2 is significantly affected for the TFEMA copolymers. DFT calculations reveal that the phenomenon is most likely caused by the pH‐induced changes in the distance of fluoroorganic groups within a polymer chain.
Consumers are increasingly interested in buying locally produced food but often cannot recognise it on the market. As the European Union has not introduced a local food labelling scheme, the study examines how selected countries defined and labelled local food and whether the implemented brands are suitable for fulfilling their functions of identifying, promoting and guaranteeing local products, avoiding misleading consumers. The question of to what extent geographical indications can be used as a tool to identify locally produced food is also considered. The analysis shows that there is a variety of local or regional, public and private brands that are the result of bottom-up initiatives and local self-governance, but their proliferation, differences in legal nature and the meaning of the messages conveyed adversely affect their function. Therefore, a harmonised labelling should be introduced at the UE level, otherwise at a national level, as a ready-made tool for promoting and distinguishing local products on the market, ensuring a uniform understanding of the label for all participants in the food chain, preventing fraud and unfair competition, and giving consumers confidence in its message.
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