Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.
1999
Volume 2
Issue 2
Topic:
Food Science and Technology
ELECTRONIC
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Jaworska G. , Kmiecik W. 1999. CONTENT OF SELECTED MINERAL COMPOUNDS, NITRATES III AND V, AND OXALATES IN SPINACH (SPINACIA OLERACEA L.) AND NEW ZEALAND SPINACH (TETRAGONIA EXPANSA MURR.) FROM SPRING AND AUTUMN GROWING SEASONS, EJPAU 2(2), #03.
Available Online: http://www.ejpau.media.pl/volume2/issue2/food/abs-03.html

CONTENT OF SELECTED MINERAL COMPOUNDS, NITRATES III AND V, AND OXALATES IN SPINACH (SPINACIA OLERACEA L.) AND NEW ZEALAND SPINACH (TETRAGONIA EXPANSA MURR.) FROM SPRING AND AUTUMN GROWING SEASONS

Grazyna Jaworska, Waldemar Kmiecik

 

ABSTRACT



The alkalinity of ash, content of selected mineral compounds, nitrates III and V, and soluble and total oxalates were determined in spinach and New Zealand spinach grown in the spring or autumn period in the aspect of using these crops as a raw material for the food processing industry. In 100 g fresh weight of spinach the alkalinity of ash was 17.4-18.9 cm3 1 M HCL. As for the analysed factors, the following values were determined: potassium 628-663 mg, phosphorus 34-59 mg, calcium 109-340 mg, magnesium 68-78 mg, sodium 24-30 mg, iron 4, mg, nitrates 11.0-165.0 mg, nitrites 0.06-0.08 mg, soluble oxalates 347-563 mg, and total oxalates 370-938 mg. The mean alkalinity of ash in fresh weight of New Zealand spinach was 12% lower than in spinach. Also the content of potassium was 41% lower, of phosphorus 49%, of calcium 52%, of magnesium 38%, of iron 9%, of soluble oxalates 32%, of total oxalates 40%, and of nitrites 53%. The content of sodium was 222% and of nitrates 92% higher. In the two species cha

Key words: spinach, New Zealand spinach, date of harvest, alkalinity of ash, minerals, nitrates, nitrites, oxalates.