Catalase is an important index to measure the freshness of wheat grains.In this paper,we built an equation for calibrating catalase in wheat samples by using near-infrared spectroscopy in combination with chemical metering method,verified and optimized the equation to obtain an optimum equation.The cross-validation correlation coefficient(1-VR) of the equation was 0.688,the RSQ value was 0.947,the SEC value was 3.363,the SECV value was 7.303,and the SEP value was 3.361.The external validation showed that th...