الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Grape , mango , peach and tomato are the most important fruits grown in Egypt . Large quantities of wastes are being left over and disposal of these waste materials becomes difficult and pose serious problems, where they are considered a main source of microbial contamination and pollution . Peel and kernels are the most important wastes remaining after the processing of grape , mango , peach and tomato fruits . Therefore , this work was a trial to utilize of these wastes as food additives as source of dietary fibers and untraditional sources of edible oils with highly antioxidative properties and antimicrobial agents. Peach peel had the highest value of water holding capacity ( 9.649 gm / gm ) followed by tomato , mango and grape peel ( 9.406 , 7.876 and 7.862 gm / gm respectively ). Oil holding capacity ( OHC ) of tomato peel was the highest value ( 2.530 ) . Peach and mango peel residues had the highest amounts of TDF ( 76.320 and 62.687 % , respectively ) . Peach peel had the highest content of pectin ( soluble dietary fibers ) ( 39.712 % ) , which recorded more three folds ( 12.147 % ) than mango peel pectin content . Both peach and tomato seeds had the highest contents of fat (43.14 ,26.24 % , respectively ) and protein ( 22.65 , 28.64% , respectively ) while mango and grape seeds had the highest values of total carbohydrates and crude fibers ( 55.841 and 32.747 % , respectively ) . Calcium , iron and zinc contents of all tested fruits wastes were found in a large and sufficient portion . Iodine value of grape seeds oil was the highest value ( 135.45 ) compared with those of the other extracted oils , while mango seed kernels oil showed the lowest iodine value (60.53). Grape seeds oil considered as a drying oil while peach and tomato crude oils are semi drying oils , and mango seed kernels oil is considered as non drying oil . Grape seeds oil contains a large amount of USFA followed by tomato seeds oil , peach and mango seeds kernels oils . Linoleic acid ( C18:2 ) was the predominant fatty acid ( 56.33 % ) followed by oleic acid ( 23.47 % ) . Also, grape seeds oil was characterized by a low level of total USFA ( 13.89 % ) , mainly , palmitic acid ( 9.46 % ) and stearic acid ( 4.05 % ) , as well as a relatively high level of MUSFA ( oleic acid ) ( 23.465 % ) . Both stearic and oleic acids of mango seed kernels oil were the major fatty acids ( 40.748 and 40.992 % of total SFA and USFA ,respectively ) . Mango and grape seeds are considered to be rich sources of natural antioxidants and had a necessary biocomponents that play a great role in protecting human body and it could be used in the food industries .