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Abstract The aims of this study were to investigate the use of the peach palm by-products - PPBs (shell and sheaths) as substrate to Pleurotus ostreatus cultivation, evaluate its composition, and the antioxidant properties. The cultivation conditions were defined varying the C:N ratio and moisture content, using as substrate PPBs, and for comparison, a control medium of sawdust was used. P. ostreatus produced in these substrates and a commercial sample were evaluated as composition and antioxidant properties; in these last analyzes it was previous defined how to extract the highest content of phenolic compounds (TPC). The highest yield of P. ostreatus (24.47% wet basis, w.b.) was obtained using the PPB with C:N of 69.14 and moisture of 86.2% (w w-1); yield higher than that found in the control medium (17.15% w.b.). The protein content of commercial mushroom (28 g 100 g-1, dry basis - d.b.) was higher than the cultivated samples (16 g 100 g-1, d.b). In the mushroom samples the contents of ashes, lipids and dietary fibers ranged between 6.09 and 6.92 g 100g-1, d.b, 1.22 to 1.72 g 100g-1, d.b and 39.46 and 43.24 g 100g-1, d.b, respectively. The best condition for TPC extraction was: 38.8 min, using 29.4% (v v-1) of ethanol. P. ostreatus cultivated in PPBs showed the highest contents of TPC, phenolic acids (gallic, vanillic, trans-cinnamic, ferulic and coumaric), and antioxidant activity. Therefore, PPB is a low-cost alternative to mushrooms cultivation with high nutritional value, avoiding environmental problems of its incorrect disposal. byproducts by products shell sheaths properties CN C N comparison used P TPC. . (TPC) 24.47% 2447 24 47 (24.47 w.b. wb w b 6914 69 14 69.1 862 86 2 86.2 w1 1 w-1) 17.15% 1715 17 15 (17.15 w.b.. 28 (2 10 g1, g1 1, g-1 d.b. db d 16 (1 d.b) ashes 609 6 09 6.0 692 92 6.9 100g1, 100g1 100g 100g-1 122 22 1.2 172 72 1.7 3946 39 46 39.4 4324 43 43.2 respectively 388 38 8 38. min 294 29 4 29.4 v v1 v-1 ethanol gallic, gallic (gallic vanillic transcinnamic, transcinnamic trans cinnamic, cinnamic trans-cinnamic coumaric, coumaric , coumaric) activity Therefore lowcost low cost value disposal (TPC 24.47 244 (24.4 w.b 691 69. 86. w-1 17.15 171 (17.1 ( g- 60 0 6. 9 100g- 12 1. 7 394 3 39. 432 43. 29. v- 24.4 (24. w- 17.1 (17. 24. (24 17. (17