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Physicochemical properties of whole fruit plum powders obtained using different drying technologies
Anna Michalska1, Aneta Wojdyło2, Krzysztof Lech3
1Institute of Agricultural Engineering, Wrocław University of Environmental and Life Sciences, ul. Chełmońskiego 37a, Wrocław 51-630, Poland; Institute of Animal Reproduction and Food Research of the Polish Academy of Science, ul. Tuwima 10, Olsztyn 10-748, Poland.
Abstract:
Physicochemical quality parameters of plum powders obtained by applying conventional drying methods and their combination devised to process plums were evaluated. The effect of freeze-drying (FD), vacuum drying (VD), convective drying (CD), microwave-vacuum drying (MVD) and combination of convective pre-drying and microwave finish-drying (CPD-MVFD) affected physical (bulk density, porosity, colour, solubility) and chemical (polyphenolic compounds determined by UPLC and antioxidant capacity by TEAC ABTS and FRAP methods) properties of plum powders. The MVD at 1.2 W g(-1) and a novel combination for plum powders production - CPD-MVFD at 70 °C/1.2 W g(-1) allowed the best preservation of phenolic compounds and increased the efficiency of production. Results obtained support the use of MVD and its combination for better quality of dried plum products. The study proved that the determination of the browning index and HMF level (formed via Maillard reaction) might be good tool for monitoring the thermal processing of plum powders.
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