TAILIEUCHUNG - Effect of storage time on some mechanical properties and bruise susceptibility of pears and apples

This research was conducted to evaluate the effect of storage time on some mechanical properties and bruise susceptibility of Williams and Ankara varieties of pear and Starkspur Golden Delicious and Starking varieties of apple. | Turk J Agric For 29 (2005) 469-482 © TÜB‹TAK Effect of Storage Time on Some Mechanical Properties and Bruise Susceptibility of Pears and Apples Yeflim Benal YURTLU* Agricultural Equipment and Machinery Test Center, Ministry of Agriculture and Rural Affairs, Ankara - TURKEY Do¤an ERDO⁄AN Department of Agricultural Machinery, Agricultural Faculty, Ankara University, Ankara - TURKEY Received: Abstract: This research was conducted to evaluate the effect of storage time on some mechanical properties and bruise susceptibility of Williams and Ankara varieties of pear and Starkspur Golden Delicious and Starking varieties of apple. The research was performed in 2 stages. Firstly, compression tests were conducted to determine the mechanical properties of fruits. Secondly, an impact test was used to determine the bruise susceptibility of test materials. Impact tests were performed using a pendulum with 50 cm arm length. The tests were carried out at 5 storage times (harvest day, 1st, 2nd, 3rd and 4th month) and 3 drop heights for the impact tests (10, 15 and 20 cm). During the compression tests, a curve-ended cylindrical probe with 8 mm diameter was used to compress the fruit at 7 mm min-1 load velocity. Results of the compression tests indicate that the bioyield point force, modulus of elasticity and deformation energy of the pear and apple varieties decreased with increasing storage time. Modulus of elasticity decreased from to MPa for Williams, from to MPa for Ankara, from to MPa for Starkspur Golden Delicious and from to MPa for Starking with increasing storage time. The impact test results show that the bruise susceptibility values of Ankara and Starking are higher than those of the other varieties when a comparison is made between 2 varieties. The bruise susceptibilities of Williams and both apple varieties tended to decrease with increasing storage time, whereas that of Ankara increased. According to the analyses of

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