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To abate the severe air pollution, the Chinese government released the Action Plan of Air Pollution Prevention and Control (APAPPC) in 2013. This paper regards the APAPPC as a quasi-experiment and uses the DID method to investigate the impact of environmental regulation on the growth of green total-factor productivity of China's industries. This article employs the non-radial directional distance function (NDDF) and the global Malmquist index to measure the total-factor carbon productivity of China's industries. Further regressions suggest that the implementation of the APAPPC has significantly promoted the growth of the total-factor carbon productivity in the air pollution-intensive industries, and its marginal effect has steadily increased with time. This result is still valid after using a series of counterfactual tests and robustness tests. The further mechanism study shows that the APAPPC has significantly promoted R&D investment, especially in instruments and equipment, which has effectively promoted technical efficiency and technological advancement. It indicates that stringent and well-designed environmental regulations should lead to a "win-win" situation of environmental improvement and economic development by encouraging enterprises to upgrade their technology and equipment. • This paper uses a typical case in China to demonstrate the porter's hypothesis. • This paper uses the DEA method to measure the total-factor carbon productivity of China's industries. • The Action Plan of Air Pollution Prevention and Control in China has significantly promoted the growth of total-factor carbon productivity. • The regulation promotes productivity by propelling enterprises to increase R&D investment and update their technical equipment. [ABSTRACT FROM AUTHOR]

[Display omitted] • A suitable 1H qNMR-based technique was used to quantify total macamide in five maca. • This method show potential for the quality control of maca. • A new macamide represents the first example of macamides with azelaxyl fraction. Macamides are considered bioactive markers of maca, and they have been used as food and medicine for centuries. In the present study, a 1H qNMR method was developed, and the analyses of the specificity, linearity, sensitivity, accuracy, and precision further indicate the validity of this method. Furthermore, the 1H qNMR method was applied for the quantification of total macamides in five naturally air-dried maca samples with different origins and colors. The results showed that the content of total macamides was correlated with the origins and colors: China purple maca (1845.75 ± 3.45 μg g−1) > China yellow maca (1090.20 ± 2.07 μg g−1) > Peru yellow maca (393.30 ± 2.42 μg g−1) > China and Peru black maca (each 269.10 ± 1.03 μg g−1). In addition, a new macamide, N -benzyl-(9-carboxymethyl)-octanamide (2), which is the first example of a macamide with an azelaxyl motif, was identified from Chinese purple maca. Our research not only provides a valid method to determine the content of total macamides in different maca samples but also offers a reference for quality control of maca. [ABSTRACT FROM AUTHOR]