Changes in Nitrate and Nitrite Levels of Blanched Amaranthus During Refrigeration Storage

Authors

  • Amin Ismail Universiti Putra Malaysia
  • Chew Sc Universiti Putra Malaysia
  • K. Nagendra Prasad Universiti Putra Malaysia
  • Yang Bao Chinese Academy of Sciences

Keywords:

Amaranthus, Nitrate, Nitrite, Reheating, Storage

Abstract

Changes in nitrate and nitrite contents (leaves and stem) of Amaranthus gangeticus (AG) and Amaranthus paniculatus(AP), resulting from blanching, storage time (0-4 days), storage temperature (0 and 4ºC), and reheating were analysed.Results showed that fresh AG (1859 ± 7.07 mg/kg) had higher nitrite content than AP (1262 ± 2.12 mg/kg). Nitritescontent was 506 ± 2 and 825 ± 3.5 mg/kg for AG and AP, respectively. Reheating and storage times significantlyincreased the conversion of nitrate to nitrite in AG and AP. Storage at 0 and 4oC exhibited a significant change (P <0.05) in nitrate and nitrite contents for both samples. Higher nitrite content was found in AP when stored at 4oC and0oC. The present study indicated that storage time and temperature affected the nitrite contents in blanched AG and APwhen stored in low temperatures. Apart from that reheating was also found to increase the formation of nitrite.

Author Biographies

Amin Ismail, Universiti Putra Malaysia

Department of Nutrition and DieteticsFaculty of Medicine and Health Sciences

Yang Bao, Chinese Academy of Sciences

South China Botanical Garden

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Published

2011-06-30

Issue

Vol. 9 No. 1 (2011)

Section

Articles

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