Puncture mechanical characteristic and microstructure analysis of different varieties of apple pulp and core
[Objective]To research the effects of apple pulp and core tissue on fruit parenchyma,in order to provide data support for the transportation and storage characteristics of apples,the puncture mechanical characteristic tests were conducted on the pulp and core of'Red Fuji'and'Danxia'apples.[Method]Using TA.XT plus texture instrument,the puncture mechanical tests were carried out on'Red Fuji'and'Danxia'apple pulp and core with six loading speeds of 0.01,0.10,1.00,5.00,9.00,13.00 mm/s,to obtain the mechanical characteristics parameters of pulp and core,such as fracture force,fracture deformation,fracture slope,fracture work,and total fracture work,and analyze the effect of loading speed on the puncture mechanical characteristics parameters of pulp and core.The microstructure of pulp and core of different varieties was observed by laser confocal microscope,and the differences in the tissue structure of different varieties were obtained.[Result]In the same variety of apple flesh and core puncture,there were two or more peaks of the mechanical property indexes during the process of reaching the limit value,which exhibited fluctuation.There were differences in the fracture force,fracture deformation,fracture slope,fracture work,and total fracture work of the same variety of apple pulp at different loading speeds,and the values of fracture force,fracture deformation,fracture slope,and fracture work of'Red Fuji'apple core are the smallest at 1.00 mm/s loading speed and the largest at 9.00 mm/s loading speed,respectively.The fracture force and deformation of'Danxia'pulp and core at the same loading speed were less than those of'Red Fuji'pulp and core,respectively.There were no significant differences in the fracture slope and total fracture work of pulp and core tissue between the two varieties of apples.The puncture fracture work of'Red Fuji'pulp and core was significantly greater than'Danxia';The flesh cells of the'Red Fuji'variety were mostly oval shaped,with one end being sharper and the intercellular connections being tighter.The'Danxia'pulp cells had a higher roundness rate and a longer distance between flesh cell junctions.The core cells of'Red Fuji'variety were elongated and longer intercellular junctions,and'Danxia'core cells were relatively sharp and tightly packed.[Conclusion]'Danxia'pulp and core are easier to reach the fracture point and are susceptible to puncture and fracture damage.'Red Fuji'and'Danxia'varieties have different tissue characteristics in their flesh and core cells,exhibiting different mechanical properties.The tissue cells and pores of'Danxia'apple are closer to circular,with fewer intercellular connections.The flesh and core of'Danxia'fruit are more fragile than those of the'Red Fuji'variety,and its ability to resist external damage is weaker.
万方数据
维普
