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Valorization of Banana and Red Beetroot Peels: Determination of Basic Macrocomponent Composition, Application of Novel Extraction Methodology and Assessment of Biological Activity In Vitro

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Faculty of Food Technology and Biotechnology, University in Zagreb, Pierottijeva 6, 10 000 Zagreb, Croatia
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Faculty of Food Technology, Josip Juraj Strossmayer University of Osijek, Franje Kuhača 20, 31 000 Osijek, Croatia
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Institute for Medical Research and Occupational Health, Ksaverska Cesta 2, 10 000, Zagreb, Croatia
*
Author to whom correspondence should be addressed.
Sustainability 2020, 12(11), 4539; https://doi.org/10.3390/su12114539
Received: 10 May 2020 / Revised: 31 May 2020 / Accepted: 1 June 2020 / Published: 3 June 2020
(This article belongs to the Special Issue Sustainable Food Processing)
The nutritional and bioactive content of banana and red beetroot peels was investigated. The basic macrocomponent composition was determined using standard AOAC (Association of Official Analytical Chemists) methods, while the recovery efficiency of bioactive compounds was investigated using conventional and innovative extraction techniques (subcritical water extraction, ultrasound- and microwave-assisted extraction). Extracts were analyzed for biological effects in vitro on human hepatic, tongue and colon cancer cell lines. A macrocomponent analysis revealed a notable amount of dietary fiber in banana and beetroot peels (39.0 and 33.6% dmb) and a relatively high content of protein in beetroot peel (18.3% dmb). Regarding the micronutrients-minerals, banana and beetroot peels were shown to be a very good source of potassium (75.06 and 41.86 mg g−1 dmb). Both extracts of banana and beetroot peels obtained by conventional extraction - decoction (100 °C, 20 min) exhibited the highest total phenolic content and antioxidant capacity. Additionally, in banana peel, these extracts were the richest in dopamine content (12.63 mg g−1 dmb). Extraction by infusion (80 °C, 30 min) yielded a beetroot peel extract with the highest total betacyanin content (9.80 mg g−1 dmb). Biological effects in vitro were dose- and time-dependent, as well as influenced by the presence of polysaccharides. View Full-Text
Keywords: bioactives; banana peel; red beetroot peel; novel extraction; cytotoxicity bioactives; banana peel; red beetroot peel; novel extraction; cytotoxicity
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Šeremet, D.; Durgo, K.; Jokić, S.; Huđek, A.; Vojvodić Cebin, A.; Mandura, A.; Jurasović, J.; Komes, D. Valorization of Banana and Red Beetroot Peels: Determination of Basic Macrocomponent Composition, Application of Novel Extraction Methodology and Assessment of Biological Activity In Vitro. Sustainability 2020, 12, 4539.

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