ABSTRACT
Aliphatic amines in infant food packaging materials were extracted and concentrated by 0 . 5 mL of acidified methanol using gas purge microsyringe extraction ( GP-MSE ) . Pre-column fluorescence labeling of amines was achieved in mild conditions with 10-ethyl-acridine-2-sulfonyl chloride ( EASC ) as labeling reagent. The derivatization was carried out at 60℃ and pH 10. The derivatives were successfully separated on a Hypersil GOLD column with excitation and emission wavelengths of 262 and 430 nm, respectively. The detection limits were in the range of 0. 4-0. 6 μg/kg, and the quantitation limits were in the range of 1. 2-2. 1 μg/kg. All analytes were in good linearity in the concentration range of 2. 0-2000 μg/L with correlation coefficients of higher than 0. 998. The developed method was characterized by celerity, accuracy and high sensitivity. It was successfully applied to the determination of aliphatic amines in infant food packaging materials.
ABSTRACT
OBJECTIVE:To provide a reference for promoting the effect of government subsidies to the R&D conducted by pharmaceutical enterprises,increasing enterprises’internal input to R&D and improving innovation performance. METHODS:By building the theoretical model of the relation of the government subsidies and internal input to R&D and the innovation performance on the basis of the assumptions,the empirical study was conducted on the pharmaceutical enterprises in Jiangsu Province though re-gression analysis and mediating effect analysis. RESULTS & CONCLUSIONS:The scale designed had good reliability and validity. The final model was obtained after empirical test. Giving considerations to relevant coefficients,the results showed that all assump-tions were verified except 3. Where,government subsidies to the R&D promoted enterprises’internal input to R&D and innovation performance,and internal input to R&D served as a complete mediator between government subsidies to the R&D and innovation performance,that is to say,government subsidies to the R&D had indirect promotion influence on innovation performance,with the influence coefficient as 0.405. It is suggested that the government should increase subsidies to R&D conducted by pharmaceuti-cal enterprises in a reasonable manner to make full use of the guiding function of government funds,and pharmaceutical enterprises should attach importance to internal input to R&D and establish its principal status in innovation system.