Chlorophyll stability in yerba maté leaves in controlled atmospheres

Brazilian Archives of Biology and Technology

Rubén O. Morawicki¹  Miguel E. Schmalko¹  Rodolfo G. Känzig¹ 

[1] ,Universidad Nacional de Misiones Facultad de Ciencias Exactas, Químicas y Naturales Centro de Investigación y Desarrollo TecnológicoPosadas Misiones ,Argentina

关键词: yerba maté;    chlorophyll stability;    controlled atmosphere;   

DOI  :  10.1590/S1516-89131999000100012

来源: SciELO

【 摘 要 】

The objective of this research was to investigate the stability of chlorophyll in yerba maté leaves in controlled atmospheres of CO2/air mixtures and different water activities at 25°C.Two levels of water activity were selected corresponding to saturated salt solutions of LiCl (a w=0.113) and MgCl2(a w=0.330) and three levels of CO2/air mixtures (0/100,20/80 and 40/60). The chlorophyll content was evaluated using a liquid chromatography HPLC technique. Experimental values varied between 2.16 and 0.61 mg/g of dry matter. For each sample, 5 determination were made during 58 days. Experimental values were fitted to an equation describing a first order reaction. In all cases, the agreement was good with P<3 10-3. The initial concentration of chlorophyll dropped, in average, to 30.5% after 58 days. However, after comparing the velocity constants, no differences were found between them.

【 授权许可】

CC BY-NC   
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