Anais do Simpósio Latino Americano de Ciências de Alimentos
Proceedings of 14 SLACA - Latin American Symposium on Food Science

The use of food by-products to obtain value-added products represents an efficient alternative to reduce industrial waste generation in alignment with the United Nations 17 Sustainable Development Goals. Mango peels represent up to 18% of mango weight and are usually wasted despite their high nutritional value. Our work aimed to evaluate the ability of starches from varied vegetable sources (corn (CS), pea (PS), potato (PTS), and rice (RS)) as carriers for Palmer mango peels in the drum-drying process. A puree with 15% (w/w) of solids content was formulated, wherein 67.6% of the solids were from mango peels; 28.6% from the starch; 3.8% from soybean lecithin. The mango peels added with water (1(peels):1.2(water) weight ratio) were processed in a controlled comminution equipment and then homogenized with the additives. The drum-drying process was performed with 3.5-4.0 kgf pressure (138.2–142.9 °C) and retention time of 15s. PTS presented significant (p<0.05) lower mass flow rate (1.85 kg.h-1.m2) than CS (2.68 kg.h-1.m2), PS (3.01 kg.h-1.m2), and RS (3.41 kg.h-1.m2). Significant lower water content was reached by RS (1.08%) and PTS (1.16%) compared to PS (1.90%) and CS (2.33%). Similar behaviour was observed for water activity (0.1551(RS)<0.1755(PTS)<0.2275(PS)≤0.2292(CS)). PTS and RS presented the highest retention of phenolic compounds (112% and 109%, respectively), followed by CS (107%) and PS (79%). Smaller retentions were obtained for ascorbic acid (~50% for PS, PTS and RS; ~38% for CS) probably because of its thermosensitivity. Following the trends for phenolics retention, antioxidant capacity was higher in the formulations with RS and PTS (around 190 and 250 µmol TE/g d.b. by DPPH and ABTS methods, respectively). The four starches produced dried products with low moisture content and low water activity, which are fundamental for product stability. Nonetheless, RS and PTS provided outstanding retention of bioactive compounds and antioxidant capacity.