الفهرس 
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Abstract
Food processing generally creates byproducts and waste materials. In many cases the by-products are unusable and their accumulation and/or disposal leads to environmental problems. Utilization of the waste products is therefore attractive, especially if they are transformed into a product with a high market value. Orange fruit by products (OFW) can be an important by-product in the processing fruit plants, which produce mainly manufactured juice and essential oils. Guava by products were rich in moisture, fat, protein, ash, fiber and minerals content. Tomato by products contained high carbohydrates ,lipids protein contents . for the mineral content , potassium was high (473.22 mg /100 g . on dry basis ) . fatty acid analysis indicated that palmitic and linoleic acid were the prevalent saturated and unsaturated acids (C18) .So, The present study was designed to investigate the possible utilization of 3 Egyptian food processing by products (orange , guava and tomato by products) as substrates for preparation of many products as bakery , meat and ice cream products, determine the chemical composition , amino acids , mineral microbial quality of these products The obtained results could be summarized in the following Orange by products contained 15.91, 7.56, 18.1, 15.67 and 42.76% protein, lipids, fiber, ash and carbohydrates respectively, while in case of guava by products contained 1.41, 2.1, 3.33, 6.78 and 86.38 % of thesame content respectively.