Natural pigments (anthocyanins and chlorophyll) and antioxidants profiling of European red and green gooseberry (Ribes uva-crispa L.) extracted using green techniques (UAE-citric acid-mediated extraction)Hussain, Shehzad; Sharma, Minaxi; Jarg, Tatsiana; Aav, Riina; Bhat, RajeevCurrent research in food science2023 / art. 100629 https://doi.org/10.1016/j.crfs.2023.100629 Plant pigments as natural food coloursHamburg, Anu; Hamburg, AndresKemia-kemi = [Finnish chemistry]1991 / p- 951 https://www.ester.ee/record=b1201067*est