Oxalic acid concentrations in Purslane (Portulaca oleraceae L.) is altered by the stage of harvest and the nitrate to ammonium ratios in hydroponics

Palaniswamy, Usha R.; Bible, Bernard B.; McAvoy, Richard

doi:10.1016/j.scienta.2004.01.006

Cited by 80 publications

(64 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The same results have been observed in other leafy vegetables, which in contrast to fruit vegetables they gain weight by continuously forming new leaves in the meristem apex (Palaniswamy, McAvoy, & Bible, 2004;Petropoulos, Akoumianakis, & Passam, 2005). Considering that leafy vegetables are usually intended for raw consumption, harvest at early stages is the common practice since texture and visual quality of leaves are the highest at these stages.…”

Section: Resultssupporting

confidence: 71%

“…Total organic acids content was higher at the 3rd growth stage (195 DAS), mostly due to higher content of oxalic and quinic acids, followed by a rapid decrease at the last harvest for both organic acids (Table 2). Although Palaniswamy et al (2004) have reported that oxalic acid decreased significantly in purslane leaves and stems at the stage of 16-true leaves comparing to 8-true leaves, this decreasing trend was only observed at late growth stages of this study (4th growth stage). However, no direct comparison between the species can be made, considering the differences in their growth cycle duration and climate requirements.…”

Section: Resultscontrasting

confidence: 71%

See 1 more Smart Citation

Chemical composition and antioxidant activity of Cichorium spinosum L. leaves in relation to developmental stage

et al. 2018

View full text Add to dashboard Cite

a b s t r a c tIn the present study, chemical composition and bioactivity of Cichorium spinosum leaves were examined at different growth stages for optimum harvest stage and end-use assessment. Total fresh weight and number of leaves were higher at 4th growth stage; however, at this stage the end-use is not indicated for raw consumption but mostly for pickled or dried products. Regarding chemical composition, the highest content of tocopherols and minerals was observed in the 1st growth stage, whereas sugars content was the highest in 3rd and 4th growth stage. Polyunsaturated fatty acids content was the highest during the first two growth stages, whereas antioxidant activity, phenolic acids and total phenolic compounds content in the 3rd stage. In conclusion, the results of this study indicate that chemical composition of C. spinosum is highly depended on development stage, and harvest stage should be considered for alternative uses of end-products with high bioactivity.

show abstract

Section: Resultssupporting

confidence: 71%

Section: Resultscontrasting

confidence: 71%

Chemical composition and antioxidant activity of Cichorium spinosum L. leaves in relation to developmental stage

et al. 2018

View full text Add to dashboard Cite

show abstract

“…In addition, it has been reported that the implementation of cultivation means such as increasing nitrogen fertilization with ammonium nitrogen and late harvesting, could alleviate the disadvantage of high oxalic acid content [6,8,22]. In our study, harvesting at 65 days after sowing (DAS) resulted in low oxalic acid content only in the case of genotypes A, B and E, whereas for the rest of the genotypes oxalic acid was significantly higher (Table 3).…”

Section: Resultsmentioning

confidence: 62%

“…In our study, harvesting at 65 days after sowing (DAS) resulted in low oxalic acid content only in the case of genotypes A, B and E, whereas for the rest of the genotypes oxalic acid was significantly higher (Table 3). Therefore, genotype A which had the highest biomass yield could be commercially cultivated since the above mentioned cultivation means have been reported to significantly reduce oxalic acid content [6,8,22]. …”

Section: Resultsmentioning

confidence: 99%

Chemical Composition and Yield of Six Genotypes of Common Purslane (Portulaca oleracea L.): An Alternative Source of Omega-3 Fatty Acids

Petropoulos

Karkanis

Fernandes

et al. 2015

Plant Foods Hum Nutr

View full text Add to dashboard Cite

Common purslane (Portulaca oleracea L.) is an annual weed rich in omega-3 fatty acids which is consumed for its edible leaves and stems. In the present study six different genotypes of common purslane (A-F) were evaluated for their nutritional value and chemical composition. Nutritional value and chemical composition depended on genotype. Oxalic acid content was the lowest for genotype D, whereas genotypes E and F are more promising for commercial cultivation, since they have low oxalic acid content. Genotype E had a very good antioxidant profile and a balanced composition of omega-3 and omega-6 fatty acids. Regarding yield, genotype A had the highest yield comparing to the other genotypes, whereas commercial varieties (E and F) did not differ from genotypes B and C. This study provides new information regarding common purslane bioactive compounds as affected by genotype and could be further implemented in food industry for products of high quality and increased added value.

show abstract

“…Furthermore, Zhang et al (2005) suggested that a nitrate: ammonium nitrogen ratio of 0.5 can result in the lowest total oxalate in spinach leaves without compromising yield. Palaniswamy et al (2004) have also reported that nitrate: ammonium nitrogen ratios may also affect the omega-3 and total fatty acids content in purslane leaves, especially α-linolenic acid which was higher at ratios of 0.5:0.5 of nitrate: ammonium nitrogen.…”

Section: Introductionmentioning

confidence: 93%

Nutrient solution composition and growing season affect yield and chemical composition of Cichorium spinosum plants

Petropoulos

Fernandes

Karkanis

et al. 2018

Scientia Horticulturae

View full text Add to dashboard Cite

A B S T R A C TNitrogen fertilizer form may affect quality and yield of leafy vegetables. In the present study, the effect of ammonium nitrogen rates on yield and chemical composition of Cichorium spinosum L. was examined. Five fertilizer treatments with different amounts of ammonium nitrogen (F1: 14%, F2: 24%, F3: 34%, F4: 43% and F5: 53% NH 4 -0N of total N) were applied. Fertilizer treatments had a significant effect on both plant fresh weight and chemical composition, depending on growing period and harvest stage. For both harvests of the 1st growing period, yield was higher in treatments F4 (43% NH 4 -N) and F5 (53% NH 4 -N), whereas in the 2nd growing period yield was higher for treatments F1, F2 and F3. Moreover, the highest content of total phenolics were recorded in the 2nd growing period. Antioxidant properties were also affected by fertilization treatments and growing periods, with antioxidant potency being higher in the 2nd growing period and for treatments F1 and F2. According to the results of the present study, nitrogen fertilizer form should be considered together with growing period and harvest stage as a useful means towards increasing the quality of the final product without compromising total yield.

show abstract

Oxalic acid concentrations in Purslane (Portulaca oleraceae L.) is altered by the stage of harvest and the nitrate to ammonium ratios in hydroponics

Cited by 80 publications

References 22 publications

Chemical composition and antioxidant activity of Cichorium spinosum L. leaves in relation to developmental stage

Chemical composition and antioxidant activity of Cichorium spinosum L. leaves in relation to developmental stage

Chemical Composition and Yield of Six Genotypes of Common Purslane (Portulaca oleracea L.): An Alternative Source of Omega-3 Fatty Acids

Nutrient solution composition and growing season affect yield and chemical composition of Cichorium spinosum plants

Contact Info

Product

Resources

About