The Relationship of Lignin and Crude Fiber in Rice Bran with Ultrasonic Wave Parameters

Abstract

This study was designed to determine the ability of ultrasonic waves to detect rice husks added to rice bran based on physical properties associated with nutrient content. This research utilizes low-intensity ultrasonic waves of 50 kHz transmitted on rice bran mixed with rice husks with particle sizes passing 30 mesh (<0.595 mm). The purpose of this study was to determine the correlation between ultrasonic parameters (attenuation and velocity) and the nutrient content (crude fiber and lignin) of rice bran containing different rice husks. Based on the results of research, there is a strong relationship between ultrasonic parameters and the nutrient content of rice bran containing various rice husks. The positive correlation between attenuation with crude fibre is 0.975, and attenuation with lignin is 0.965. The attenuation coefficient can be used as a parameter for estimating the content of lignin and crude fibre in rice bran. This research proves the high nutritional value of rice bran can be detected with ultrasonic waves. These results still need further research to measure the factors that affect ultrasonic wave transmission (amplitude) when measuring samples, as well as the manufacture of a series of compact ultrasonic test systems so that they can be applied in industry or practically in the field.