Determination of chlorophyll in plant samples by liquid chromatography using zinc-phthalocyanine as an internal standard.
Chlorophyll analysis at high precision and accuracy is limited by the lack of suitable, commercially available internal standards for HPLC analysis. Here, the commercially available dye zinc-phthalocyanine is presented as a new internal standard to quantify chlorophylls in vegetable foods and to detect chlorophyll degradation products. The technique was applied to chlorophyll analysis of a selection of vegetable foods. Pigments were extracted with N,N-dimethylformamide from the vegetables and purified by solid phase extraction. Chlorophyll a, a', b, b', corresponding pheophytins, and zinc-phthalocyanine were separated by HPLC using a C18 reverse-phase column and fluorescence detection.
Bohn
Torsten
T
Swiss Federal Institute of Technology (ETH) Zurich, Laboratory of Human Nutrition, Seestrasse 72, 8803 Rüschlikon, Switzerland.
Walczyk
Thomas
T
D002734:Chlorophyll / Q000032:analysis*; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D007211:Indoles / Q000032:analysis*; D054833:Isoindoles; D009942:Organometallic Compounds / Q000032:analysis*; D012015:Reference Standards; D015203:Reproducibility of Results; D013050:Spectrometry, Fluorescence; D017967:Zinc Compounds
D007211:Indoles; D054833:Isoindoles; D009942:Organometallic Compounds; D017967:Zinc Compounds; D002734:Chlorophyll; C052159:Zn(II)-phthalocyanine