engleski

Application of electrical impedance analysis in prediction of composition of poultry muscles

The electrical impedance measurements were investigated in the prediction of the muscle composition. Preliminary electrical measurements were done on 80 broilers "Lohman" line. The fattening was going on for 45 days and the average slaughter mass of carcasses was 1415 g (CCWt). The study was carried out on the breast muscles (M. pectoralis maior) and leg muscles back side of thigh bone (M: gluteus medius) at HT +37_o C and CT +4_o C, 24 hours post mortem. The HPRLC-Meter-42842-A device was used to measure the impedance module by puncturing four-terminal electrodes on the middle part of breast and leg muscles along and across muscle fibres. The electrodes were attached to nonconductive plate. Distance among the electrodes and puncturing depth weer constant. The electronic device worked on frequency of 15, 20, 100, 200, 500 kHz and 1MHz and tested current of 0.1 mAcf. The pH values, impedance module, (Z)and phase angle were recorded. Total water content, total fat, proteins and ash were determined by chemical analysis. The results of the impedance module measurements were most favourable on frequency of 15 kHz and phase angle on frequency of 15kHz and 1MHz. The linear regression analysis showed highly significant correlation between impedance module and chemical results of total water and fat. The results in this study ilustrate that impedance analysis can be reliably used for prediction of total water and total fat in breast and leg mucsles of broiler carcasses.

poultry ; impedance ; composition

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