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Mechanical strength of the materials: bacterial cellulose modified with glycerol (mG and G_mG); bacterial cellulose pre-treated and modified with glycerol and by entrapping apple powder (mGApp10; mGApp20; mGApp30; mGApp40; mGApp50; mGApp60; G_mGApp30; and G_mGApp50). Bacterial cellulose produced in media without (presented in grey) or with apple powder (presented in green). Different letters represent significant differences.
