Abstract: Chlorophyll was extracted from spinach leaves. Sodium chromium (III) chlorophyllin was prepared with the chlorophyll extracted through the processes of saponification, acidification, chromiuming and salt-forming reaction. Its UV-Vis spectrum was determined in comparison with the UV-Vis of sodium copper (II) chlorophyllin. At the same time the physico- chemical properties of sodium chromium (III) chlorophyllin were determined. UV-Vis spectrum of sodium chromium (III) chlorophyllin showed that there are absorption peaks at 360.8 nm, 401.6 nm and 655.1 nm, simialr to manganese (III) chlorophyllin and lanthanum (III) chlorophyll a, as confirmed coordination of Cr (III) to the prophyrin rings. Sodium chromium (III) chlorophyllin is soluble in water, stable in the neutral solution, and resistant to oxidizing agent and reducing agent. Its thermostabillity is good, but photostability weak. Some food additives such as NaCl has little effect on sodium chromium (III) chlorophyllin.

Key words: chlorophyll, sodium chromium chlorophyllin, physico-chemical property