scholarly journals Effect of selected factors on the content of ascorbic acid in potatoes with different tuber flesh colour

2009 ◽  
Vol 55 (No. 7) ◽  
pp. 281-287 ◽  
Author(s):  
K. Hamouz ◽  
J. Lachman ◽  
P. Dvořák ◽  
M. Orsák ◽  
K. Hejtmánková ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Ascorbic Acid Content ◽  
Vegetation Period ◽  
Field Trials ◽  
N Fertilization ◽  
Mineral Fertilization ◽  
Flesh Colour ◽  
Group Of Seven ◽  
Tuber Flesh ◽  
Negative Effect

In precise field trials in the years 2004–2008 in the Czech Republic the effect of conditions of location, variety and mineral fertilization on ascorbic acid content (AA) in potatoes with different tuber flesh color was investigated. Significant was the effect of variety. The Marabel variety with the highest AA content (248 mg/kg FW) exceeded other eight varieties by 13.4–74.1%. The Valfi variety, in five-year trials the only variety with purple colored flesh, ranked among analyzed varieties moderately below average. In addition, in the year 2008 the group of seven varieties with purple and red tubers was evaluated and AA content lower by 15.2% compared to the group of varieties with yellow flesh was determined. Also, significant differences were determined between the varieties with coloured tubers; the highest AA content was found in the red-fleshed variety Highland Burgundy Red (234 mg/kg FW). A negative effect on AA content in tubers was observed at increased intensity of N fertilization (at 180 kg N/ha, AA decreased by 12.4% compared to 100 kg N/ha). Enhanced levels of potassium and magnesium fertilization had no effect on the AA content. The effect of location on AA content was not shown; however, from the four locations in average of five years a pronounced trend of the highest content of ascorbic acid on the location Přerov nad Labem with the highest temperature averages during vegetation period of experimental years was determined (by 0.9°C, 2.3°C, and 5.9°C higher compared with other locations).

scholarly journals Effect of natural and growing conditions on the contentof phenolics in potatoes with different flesh colour

2010 ◽  
Vol 56 (No. 8) ◽  
pp. 368-374 ◽  
Author(s):  
K. Hamouz ◽  
J. Lachman ◽  
K. Hejtmánková ◽  
K. Pazderů ◽  
M. Čížek ◽  
...  
Keyword(s):  
Chlorogenic Acid ◽  
Vegetation Period ◽  
Field Trials ◽  
Climatic Conditions ◽  
Mountainous Area ◽  
Mineral Fertilization ◽  
Flesh Colour ◽  
Mineral N ◽  
Growing Conditions ◽  
The Impact

In precise field trials in the Czech Republic from 2004–2008 the impact of location conditions, varieties with yellow, purple and red flesh and mineral fertilization on the content of total polyphenols (TP) and chlorogenic acid was investigated. The highest TP contents were reported at two locations with extreme climatic conditions; in those under stress due to low temperatures in the vegetation period at the mountainous area Stachy (5.89 mg TP/g DM) and those under drought stress in the warm lowland location Přerov nad Labem with light sandy soil (5.81 mg TP/g DM). The five-year experiment with the purple-fleshed Valfi variety (13.29 mg TP/g DM) reached 2.46 to 3.18 times higher content of TP in comparison with eight yellow-fleshed varieties. The yellow-fleshed Karin variety (5.39 mg TP/g DM) outperformed TP content of other yellow-fleshed varieties by 3.1 to 29.1%. In another experiment conclusive differences between the eight varieties with purple and red flesh were found; the highest TP content was detected in cv. Violette (25.9 mg TP/g DM) with the darkest purple flesh. As to the chlorogenic acid content similar relationships between varieties were found as in the case of TP. High linear correlation (r = 0.8536) was found between the content of chlorogenic acid and the content of TP. Among the treatments of mineral N, P, K and Mg fertilization, the content of TP was only affected by a treatment with a higher dose of K and Mg, causing a decrease in TP content.

scholarly journals Ascorbic acid content in potato tubers with coloured flesh as affected by genotype, environment and storage

2018 ◽  
Vol 64 (No. 12) ◽  
pp. 605-611
Author(s):  
Karel Hamouz ◽  
David Bečka ◽  
Ivana Capouchová
Keyword(s):  
Ascorbic Acid ◽  
Ascorbic Acid Content ◽  
The Other ◽  
Potato Tubers ◽  
Flesh Colour ◽  
Fresh Matter ◽  
Tuber Flesh ◽  
Yellow Flesh ◽  
And Storage ◽  
Genotype A

The aim of the study was to evaluate the effect of genotype, tuber flesh colour, site conditions, year of cultivation and storage on the content of ascorbic acid (AAC) in the tubers of twelve potato cultivars with coloured flesh, compared with the yellow-flesh cv. Agria. AAC ranged from 88.6 to 282.0 mg/kg fresh matter (FM) and it was significantly influenced by genotype. A significantly highest AAC, on a three-year average, was achieved by cv. Rosemarie with red flesh (218.9 mg/kg FM; 1.10–1.84-fold more than the other cultivars). Position number two was achieved by the control cv. Agria (199.4 mg/kg FM). The purple or red colour of the cultivars with coloured flesh did not have a significant effect on the AAC. A significantly higher (1.17 times) AAC was determined at the Uhříněves site with warmer climate and drier weather before the harvest, compared with the other site in Valečov. The AAC was also significantly affected by year of cultivation. Cold storage (4°C, 180 days) resulted in a significant decrease in AAC, which varied in dependence on the genotype of the cultivars (34.6% to 65.1%). However, no link to the colour of the tuber flesh was found.

scholarly journals Dynamics of ascorbic acid accumulation in the aboveground phytomass of Galega orientalis Lam.

2021 ◽  
Vol 16 (1) ◽  
pp. 36-44
Author(s):  
I. V. Kravchenko ◽  
E. A. Moiseeva ◽  
М. V. Ustinova ◽  
L. F. Shepeleva
Keyword(s):  
Ascorbic Acid ◽  
Cover Crop ◽  
Ascorbic Acid Content ◽  
Vegetation Period ◽  
Aboveground Phytomass ◽  
Acid Accumulation ◽  
Grass Stand ◽  
Negative Effect ◽  
Galega Orientalis ◽  
Sowing Seed

Aim.To analyse the patterns of ascorbic acid content in the green mass of Galega orientalis (Galega orientalis Lam.), Gale variety, cultivated under introductory conditions to develop an effective method for increasing feed production.Material and Methods. The influence of the following factors on the accumulation of ascorbic acid in plants was considered: pre‐sowing seed preparation, the presence of a cover crop (pea), cultivation conditions, meteorological factors and the biological age of the grass stand over a three‐year period.Results. It was established that the plant mass of Galega orientalis is a source of ascorbic acid after plants enter the generative phase of development with predominant localization of vitamins in the leaves (96%). Patterns were revealed of ascorbic acid accumulation in the green phytomass of Galega orientalis depending on average daily temperature during the vegetation period (r = ‐0.69) and specific leaf surface (r = ‐0.83‐0.88). Conclusion. The data obtained also indicate a statistically significant positive effect of using Baikal‐EM1 microbiological fertilizer for seed inoculation during preparation for sowing, and a negative effect of the cover crop on the accumulation of ascorbic acid in the plant mass of Galega orientalis in its virginal and generative periods of development. 

scholarly journals Effect of conditions of locality, variety and fertilization on the content of ascorbic acid in potato tubers

2008 ◽  
Vol 53 (No. 6) ◽  
pp. 252-257 ◽  
Author(s):  
K. Hamouz ◽  
J. Lachman ◽  
P. Dvořák ◽  
O. Dušková ◽  
M. Čížek
Keyword(s):  
Ascorbic Acid ◽  
Czech Republic ◽  
Field Trials ◽  
N Fertilization ◽  
Favourable Effect ◽  
Potato Tubers ◽  
The Czech Republic ◽  
Average Temperature ◽  
Negative Effect

The effect of conditions of locality, variety and fertilization on ascorbic acid (AA) content in potato tubers was investigated in precise field trials in 2004 and 2005 in the Czech Republic. From four localities and in the two-year average the highest AA was statistically determined in the locality of Prerov nad Labem with the highest average temperature values during both experimental years (by 6.7 to 11.5% higher in comparison to other localities). Similarly, the effect of variety was also very significant; Marabel variety had the highest AA content (207.2 mg/kg fw) and exceeded other seven varieties by 15−49%. A negative effect on AA content in tubers was observed in the case of an increased intensity of N fertilization (at 180 kg N/ha AA decrease was lower by 6.1% compared to doses 100 kg N/ha). On the contrary, a favourable effect was determined at increased levels of potassium and magnesium fertilization (at 166 kg K/ha and 60 kg Mg/ha AA increase was by 6.2% higher compared to the levels of 108 kg K/ha and 30 kg Mg/ha).

scholarly journals The potential of greenhouse diffusing cover material on yield and nutritive values of lamb’s lettuce grown under diverse nitrogen regimes

Italus Hortus ◽  
2020 ◽  
Vol 27 ◽  
pp. 55-67
Author(s):  
Eugenio Cozzolino ◽  
Christophe El-Nakhel ◽  
Eugenio Ottaiano ◽  
Ida Di Mola ◽  
Mauro Mori
Keyword(s):  
Ascorbic Acid ◽  
Nutritive Value ◽  
Ascorbic Acid Content ◽  
Mediterranean Area ◽  
N Fertilization ◽  
Nitrate Content ◽  
Diffuse Light ◽  
Commission Regulation ◽  
Lettuce Yield ◽  
Nitrogen Rates

Light and nitrogen are the main factors commanding horticulture production. Therefore, this study aims at evaluating the effects of two different greenhouse cover films (clear-Film A and diffuse light-Film B) on yield and nutritive value of a ready-to-eat salad lamb’s lettuce (Valerianella locusta L.), grown under several nitrogen regimes (no nitrogen [N0], sub-optimal [N25] and optimal N fertilization [N50] corresponding to 0, 25 and 50 kg ha-1 , respectively). The combination N50 and Film B boosted SPAD index by 10.3% and yield by 91.9% compared to N0 × Film A. Concerning antioxidant activity and bioactive compounds, only total ascorbic acid was positively affected by Film B (9.4%), while there was no effect of this cover film on carotenoids and chlorophyllous pigments, which increased along the increment of nitrogen rates. Nitrate content in leaves was influenced by both factors and it showed increasing values, when nitrogen doses increased, reaching the highest value under N50-Film B conditions (3312.3 mg kg-1 fw). Our study showed that in the Mediterranean area, the use of greenhouse diffuse light film improved lamb’s lettuce yield, but on the other hand incurred significant increase in nitrate level, nonetheless remaining constantly under the legal threshold imposed by the commission regulation (EU). Secondary metabolites, such as total phenols and carotenoids, showed similar values under both films, instead the diffuse light film improved total ascorbic acid content.

scholarly journals Effect of white fleece on the selected quality parameters of early potato (Solanum tuberosum L.) tubers

2011 ◽  
Vol 49 (No. 8) ◽  
pp. 370-377 ◽  
Author(s):  
J. Laxhman ◽  
K. Hamouz ◽  
A. Hejtmánek ◽  
J. Dudjak ◽  
M. Orsák ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Solanum Tuberosum L ◽  
Ascorbic Acid Content ◽  
Field Trials ◽  
Quality Parameters ◽  
Cultivated Plants ◽  
Nitrate Content ◽  
Early Potato ◽  
Potato Tubers ◽  
Potato Genotype

The effects were tested of white fleece on the contents of ascorbic acid, nitrates, and polyphenols in 1999 and 2000, and on the carotenoids content in 2000 and 2001 intubers of two early potato varieties (Adora and Impala) in field trials on two cultivation sites (Přerov n/Labem and Prague-Troja). Early irrigated potatoes were cultivated according to the uniform methodology for field trials. Two variants were compared – cultivated plants covered with white fleece (Pegas-Agro UV 17) and the controls without any covering. The tubers were harvested three times in intervals of 7–16 days. The results were statistically tested by ANOVA and Tukey’s methods. Ascorbic acid content showed a tendency to higher values in the potatoes covered with white fleece as compared with the control samples (average increase by 12.3%). The effect of the fleece was significantly affected by the potato genotype and the year of cultivation (cv. Adora showed a content higher by 12.54% in comparison with the control). The tendency to reduce nitrate levels was observed in potato tubers cultivated under the fleece, especially in the second term of harvest (on average by 14.34%). The decrease between the first and the third term of harvest was apparent. The higher was the maturity of potato tubers, the lower nitrate content was found. Significant differences were found between the varieties (P = 0.0058) and the cultivation sites (P = 0.0399). The effect of white fleece on polyphenol content was not statistically significant. However, the effect of the year of cultivation on the polyphenols content was significant (P = 0.0094). The effect of white fleece on the carotenoids content was not statistically significant but a tendency to lower contents in the variant with white fleece was found (by 7.2%). The sites and the varieties affected the carotenoids contents significantly (P = 0.0028 and P = 0.0417, respectively).

scholarly journals Differences in anthocyanin content and antioxidant activity of potato tubers with different flesh colour

2011 ◽  
Vol 57 (No. 10) ◽  
pp. 478-485 ◽  
Author(s):  
K. Hamouz ◽  
J. Lachman ◽  
K. Pazderů ◽  
J. Tomášek ◽  
K. Hejtmánková ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Ascorbic Acid ◽  
Field Trials ◽  
Anthocyanin Content ◽  
Potato Tubers ◽  
Flesh Colour ◽  
Total Anthocyanin ◽  
The Czech Republic ◽  
Total Anthocyanin Content ◽  
Lowland Area

The aim of this study was to determine that the total anthocyanin content (TAC) and antioxidant activity (AOA) in potato flesh with different colours grown in the Czech Republic. Four yellow- or white-, six purple- and four red-fleshed varieties were grown in 2009 at two different sites (Valečov – highland, seed potato area at 460 m a.s.l., Přerov nad Labem – lowland, new potatoes area at 178 m a.s.l.) in precise field trials. For purple- and red-fleshed varieties, average TAC values ranged from 61.5 to 573.5 cyanidin mg/kg of FM and significant effect of the variety of the TAC was found. High content reached the Violette and Vitelotte varieties with dark purple flesh, and the lowest content the Blue Congo variety with light purple marbled flesh. Significantly higher TAC was found in a lowland area Přerov nad Labem, which is probably related to drought stress. The lowest AOA was achieved by a group of varieties with yellow or white flesh – averaging 82.8 mg ascorbic acid equivalent/kg FM, in a group of red-fleshed varieties it was higher 4.34 times and in a group of purple-fleshed varieties even 5.03 times higher. Also between purple-and red-fleshed varieties significant differences in AOA were found, both high and low values of AOA showed the same varieties as in the case of the TAC. Among experimental sites higher AOA was also demonstrated at Přerov nad Labem. Correlation analysis showed a strong correlation between AOA and TAC (r = 0.8099).

scholarly journals Field production of Kale (Brassica oleracea var. Acephala) with different nutrition sources

2021 ◽  
Author(s):  
MARÍA DE LAS NIEVES RODRÍGUEZ MENDOZA ◽  
Marco Antonio Mora-Bautista ◽  
José Luis García Cué ◽  
Julio Sánchez Escudero ◽  
Jorge Dionisio Etchevers Barra
Keyword(s):  
Ascorbic Acid ◽  
Brassica Oleracea ◽  
Mineral Soil ◽  
Ascorbic Acid Content ◽  
Organic Soil ◽  
Mineral Fertilization ◽  
Soil Fertilization ◽  
Foliar Fertilization ◽  
Number Of Leaves

Objective: Quantify the development and production of kale (Brassica oleracea var. Acephala cultivar “dwarf blue curled”) in field conditions with organic and mineral fertilization. Design / methodology: Kale was sown in a field in a completely rando design with five treatments and five repetitions per treatment (mineral soil fertilization, organic soil fertilization, mineral soil fertilization and foliar fertilization, organic soil fertilization and foliar fertilization and a control). After transplanting (dat) every 15 days in situ, the number of leaves was quantified and the phenological stages of the crop were identified. At 116 dat, with destructive sampling, the number length, fresh weight, resistance to penetration and ascorbic acid content in the kale leaves were quantified. Results: The growth kinetics of the plants in the organic soil and foliar fertilization excelled, compared to the other treatments. In the cuttings, 1.5 to 3 bunches per plant were obtained, the resistance increased in leaves with organic products. Ascorbic acid increased in the leaves with all fertilizations. Limitations implications: limited knowledge in the crop´s management. Conclusions: Kale is a crop that responds to different fertilization sources.  Organic soil and foliar fertilization are alternatives for kale agroecological production, It´s a vegetable scarcely grown in Mexico. The crop can be produced in the Texcoco area.

Analysis of ascorbic acid content in various fruits and vegetables by spectrofluorimetric methods

Planta Medica ◽  
2011 ◽  
Vol 77 (12) ◽  
Author(s):  
A Haskovic ◽  
A Copra Janicijevic ◽  
A Topcagic ◽  
L Klepo ◽  
A Kapur ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Acid Content ◽  
Fruits And Vegetables ◽  
Ascorbic Acid Content
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