Fishery processing industry produces a high number of by-products. Fortunately, some fish by-products can be reused and converted into valuable products, such as fish protein hydrolysates. Fish protein hydrolysate (FPH) is known to have a high functional value. This study aims to valorize the mackerel (Scomber japonicus) heads into FPH with biofunctional properties under different pH and hydrolysis duration. Hydrolysis was carried out at pH 0, 5, 7, and 9 for 12 and 24 hour. Response surface methodology was performed to determine the optimum production condition. The results showed that pH and hydrolysis duration had significant effects (p < 0.05) on yield, antioxidant activity, protein content, and degree of hydrolysis of mackerel FPH. The highest yield (59.89 ± 0.08%), with a protein content of 67.95 ± 0.49%, was obtained at pH 5 after 12 hour incubation. In addition, the mackerel fish protein hydrolysate had high antioxidant activity (36.95 ± 0.82%) with a degree of hydrolysis of 32.63 ± 1.12%. It was suggested that mackerel heads could be a potential resource to produce bio-functional fish protein hydrolysate. Further research on other properties of mackerel FPH and the use of different enzymes to produce better quality mackerel head FPH is recommended.
One of the most important things to use UAV is navigation control. Navigation control is a way to adjust the direction of the quadcopter movements according to the command of the pilot. Natural User Interface (NUI) is a new way to interact with a system as navigation control. In this study, a wearable device was made that can detect hand gestures and gives instructions to the Dji Tello drone. The MPU6050 sensor is used to provide response in two dimensional axes. The complementary filter implements low pass filter on the accelerometer and integrates the value of the gyroscope with the previous angle output. After that, the value will be fed to the high pass filter. The results of the two filters will obtain stable angle, by adjusting the filter coefficient and the sampling time. The aim of complementary filter method is to reduce noise in angular transformation when the pilot makes hand gestures. Based on the experiments, the results show that hand gestures could give command for Dji Tello drone movements successfully. Therefore, it has been proven that the hand gesture can be used for the navigation control system on the Dji Tello drone.
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