Table 1. Physicochemical properties of PS and PC

	pH	Nitrite contents (mg/kg)	Color
			CIE L*	CIE a*	CIE b*
Pre-converted nitrite from Swiss chard powder (PS)	5.39±0.01	60539.92±1660.57	51.23±3.13	3.69±0.24	27.58±1.14
Pre-converted nitrite from celery powder (PC)	8.83±0.01	62777.96±2221.21	21.30±0.18	1.55±0.27	3.16±0.14