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Beef is a nutrient-rich, and inspired by the popularity of food, but there chewing difficulties. With the improvement of people's living standards, the taste of beef are increasingly high requirements. Tenderized beef has been widely welcomed by people. After the implementation of electrical stimulation on beef carcass after slaughter can improve the tenderness of the meat, and to improve the eating quality of the meat. Electrical stimulation has become one of the most effective means of processing beef. Tenderizing results summarized and beef electrical stimulation on the basis of the use of micro-control technology and inverter technology to develop a multi-functional electrical stimulation (domestic invention patent number: 201010288873.9). The design of the various parameters of the electrical stimulation devices (waveform, voltage, current, frequency, stimulation time) is continuously adjustable within a certain range. And the use of the electrical stimulation waveform and amplitude of the single factor test and orthogonal test, obtained the best electrical stimulation parameters. The main contents and conclusions of the paper are as follows: (1) the research and development of a beef electrical stimulation tenderized instrument, the purpose of the use of low-voltage electrical stimulation to reach tenderized beef. The electrical stimulation MSP430 MCU main chip, produced under the control of different waveforms, and the voltage, current, frequency, time continuously adjustable within a certain range power. Waveform can produce five kinds of DC, square wave, triangle wave, sine wave, sawtooth wave. Each waveform amplitude adjustable, adjustment range of 0-110V, 0-450HZ frequency adjustment range, the the stimulation time adjustment range of 0-999S output 500W power as. The instrument output, high accuracy and reliability. (2) the electrical stimulation devices using the MSP430 microcontroller to control a H-bridge PWM / SPWM waveform input tube consists of four field-effect, the DC inverter shaping. Control output PWM / SPWM wave frequency and duty cycle can be different waveforms and frequency (3) through in the fixed electrical stimulation amplitude (40V), frequency (50Hz) stimulation time (60s), study kinds of waveform (DC, square wave, sine wave, triangle wave, sawtooth wave) of Luxi cattle meat tenderizer effect. The results show that the different waveforms of electrical stimulation on beef shear force values ??highly significant (P lt; 0.001). 7d after DC, square wave, sine wave, triangle wave, sawtooth stimulus, shear force values ??with the control respectively, compared to a decrease of 9.78%, 18.78%, 14.23%, 13.72%, 17.30%. It can be seen that the best electrical stimulation waveform is a square wave. (4) better electrical stimulation on single factor test waveforms - square wave electrical stimulation waveforms, fixed frequency (50Hz) stimulation time (60s), analysis of different amplitude (low-voltage segment) electrical stimulation of Luxi shear force values ??of beef. The results show that the different amplitude electrical stimulation on beef shear force values ??was significantly (P lt; 0.001). 7d shear force values ??with the control respectively, compared 13.02% (20V), 18.78% (40V), 20.84% ??(60V), 17.38% (80V), 17.65% (100V). It can be seen better electrical stimulation amplitude of 60V. (5) Considering the waveform amplitude, stimulus frequency, stimulus orthogonal experiment. The results show the impact of low-voltage electrical stimulation effect of electrical stimulation parameters for the waveform, amplitude, stimulation time. Luxi cattle optimal electrical stimulation parameters for a square wave (80V, 100HZ), stimulus duration 60S. Cattle carcass after slaughter optimal electrical stimulation parameters stimulation, mature 7d shear force values ??compared with the control reduced by 23.03%. Can be considered the best electrical stimulation parameter combinations used in cattle slaughter process in order to reduce the maturation time, improve the eating quality of beef.
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