用分光光度法分别对胡椒、花椒、辣椒粉的乙醇浸提液测吸光度,扫描波长范围为700~200 nm,数据间隔为1 nm,积分时间为0.2 s。数据经过处理后得到相应的导数光谱。试验发现,胡椒、花椒、辣椒粉吸收光谱的特征峰明显,经数据处理得到的一阶和二阶导数光谱信息量大,结合吸收光谱-导数光谱法可以科学地、快速地将不同品牌、来源的市售调味粉与纯品进行比较、分析,判断其纯度和掺杂情况。 The absorbance of ethanol extract of pepper, pepper and chili powder was measured by spectrophotometry. The scanning wavelength range was 700 ~ 200 nm, the data interval was 1 nm and the integration time was 0.2 s. The data is processed to obtain the corresponding derivative spectrum. The results showed that the characteristic peaks of the absorption spectra of pepper, pepper and paprika were obvious. The information of the first and second derivative spectra obtained by the data processing was large. Combined with absorption spectrum - derivative spectroscopy, the different brands, sources Of the market seasoning powder and pure comparison, analysis, to determine the purity and doping.