Polyphenols in greenhouse and open-air-grown lettuce

Romani, Annalisa; Pinelli, Patrizia; Galardi, Carlotta; Sani, G.; Cimato, A.; Heimler, Daniela

doi:10.1016/s0308-8146(02)00170-x

Cited by 128 publications

(122 citation statements)

References 20 publications

(19 reference statements)

Supporting

Mentioning

103

Contrasting

Unclassified

Order By: Relevance

“…Free tartaric acid is also present, as seen from a resonance at 4.34 ppm. However, the previously reported presence of caffeoylmalic acid and 3,5-di-O-caffeoylquinic acid 17,18 was not confirmed.…”

Section: Nmr Analysis Of the Aqueous Extractmentioning

confidence: 57%

“…Starting from According to the literature, the main phenolic compounds present in lettuce are monocaffeoyltartaric acid, dicaffeoyltartaric acid (chicoric acid), 5-caffeoylquinic acid (chlorogenic acid), caffeoylmalic acid and 3,5-di-O-caffeoylquinic acid. 17,18 The total amount of phenolic compounds in leaves of lettuce depends on the cultivar and on the ripening stage and normally is in the range between 0.5 and 2 mg/g of fresh weight. 17,18 In the 1 H NMR spectrum of lettuce extract in buffered D 2 O, three derivatives of caffeic acid were identified: monocaffeoyltartaric acid (1.5 mg/g dry weight), chicoric acid (15.5 mg/g, dry weight) and chlorogenic acid (8.2 mg/g dry weight) ( Table 1).…”

Section: Nmr Analysis Of the Aqueous Extractmentioning

confidence: 99%

“…17,18 The total amount of phenolic compounds in leaves of lettuce depends on the cultivar and on the ripening stage and normally is in the range between 0.5 and 2 mg/g of fresh weight. 17,18 In the 1 H NMR spectrum of lettuce extract in buffered D 2 O, three derivatives of caffeic acid were identified: monocaffeoyltartaric acid (1.5 mg/g dry weight), chicoric acid (15.5 mg/g, dry weight) and chlorogenic acid (8.2 mg/g dry weight) ( Table 1). The presence of the esters of tartaric acid with caffeic acid was evidenced by the characteristic CH(O)COOH signals at 5.55 ppm (chicoric acid) and 5.31 ppm (monocaffeoyltartaric acid).…”

Section: Nmr Analysis Of the Aqueous Extractmentioning

confidence: 99%

See 2 more Smart Citations

Metabolic profile of lettuce leaves by high-field NMR spectra

Sobolev¹,

Brosio²,

Gianferri³

et al. 2005

Magn. Reson. Chem.

146

135

View full text Add to dashboard Cite

A detailed analysis of the proton high-field NMR spectra of aqueous and organic extracts of lettuce leaves is reported for the first time. A combination of COSY, TOCSY, 1 H-13 C HSQC, 1 H-13 C HMBC bidimensional sequences and DOSY was used to assign each spin system and to separate the components of the complex patterns. A large number of water-soluble metabolites belonging to different classes such as carbohydrates, polyols, organic acids and amino acids were fully assigned. Moreover, the complex spectra of metabolites extracted in organic solvents belonging to sterols, fatty acids, diacylglycerophospholipids, galactosyldiacylglycerols, sulpholipids, pheophytins, carotenoids and hydrocarbons were also assigned.

show abstract

Section: Nmr Analysis Of the Aqueous Extractmentioning

confidence: 57%

Section: Nmr Analysis Of the Aqueous Extractmentioning

confidence: 99%

Section: Nmr Analysis Of the Aqueous Extractmentioning

confidence: 99%

See 1 more Smart Citation

Metabolic profile of lettuce leaves by high-field NMR spectra

Sobolev¹,

Brosio²,

Gianferri³

et al. 2005

Magn. Reson. Chem.

146

135

View full text Add to dashboard Cite

show abstract

“…Enzymatic browning in lettuce is initiated by oxidation of phenol compounds through polyphenol oxidize activity and peroxidase (Romani et al, 2002).…”

Section: Resultsmentioning

confidence: 99%

Silicon in the turgidity maintenance of American lettuce

Mattiuz¹,

Filho²,

Muniz³

et al. 2015

Afr. J. Agric. Res.

View full text Add to dashboard Cite

This study aimed to verify the influence of silicon application in hydroponics lettuce cv Lucy Brown, on post-harvest under refrigeration. In hydroponic production silicon was used in the doses of 0, 28, 56 and 84 mg L -1 of potassium silicate. Lettuces were harvested early in the morning and immediately transported to UNESP, campus of Jaboticabal. Upon being received at the laboratory the plants were standardized in size and appearance, removing the three older leaves. The plants were placed in polystyrene trays (Styrofoam © ) and packaged under the temperature at 8±2°C and 80 ± 3% relative humidity. The experimental design was completely randomized with three replications, and two plants per repetition. The fresh matter of shoots was analyzed together with the silicon content in the leaves, the firmness, the fresh matter loss, titratable acidity, pH and enzyme activity of polyphenoloxidize and peroxides. The evaluations were performed every four days, for a total of 16 days of storage. The concentration of 84 mg L -1 silicon increased the fresh matter of the plant at harvest and post-harvest, provided less water loss and consequently greater firmness in the leaves during the storage period for lettuce at 8±2°C for 16 days.

show abstract

“…lysine and methionine [2] in addition to dietary fiber, vitamins and dietary minerals [3]. It is reported to contain high amount of antioxidant compounds [4] including vitamin C, carotenoids and phenolic compounds such as flavonoids [5]. Short shelf life is one of the major problems associated with this crop [6].…”

Section: Introductionmentioning

confidence: 99%

Yield, Keeping Quality, Antioxidant Content and Some Nutritional Aspects of Selected Accessions of AmaranthusTricolor

Malathy¹,

Suraweera²,

Daundasekara³

et al. 2012

IJBBB

View full text Add to dashboard Cite

Abstract-The Department of Agriculture (DOA), Sri Lanka has given priorities to identify new leafy vegetable varieties with high yielding capacity and superior in nutritional quality. As a part of this activity, yield potential, nutritional values and antioxidant properties of some promising accessions of Amaranthus tricolor were studied with the aim of selecting better varieties. Experiments were carried out using three new accessions; 'DOA Red', 'Pure green' and 'Diyapalagoda' along with the recommended variety, 'DOA green'. Yield potential was determined through growth and yield parameters. Comparison of leaf protein levels was done by Kjeldahl method. Carotenoid, anthocyanin, chlorophyll levels and the antioxidant activity of the leaves of four accessions was determined by UV-spectrophotometry. Postharvest keeping quality among accessions was compared under three storage condition: cut stem ends dipped in water and stored under ambient conditions, packaged in Low Density Polyethylene (LDPE) film and stored under ambient conditions, packaged in LDPE and stored under 10°C and 90% RH. Shelf life was determined using visual quality. 'DOA Red' contained higher amount of chlorophyll, anthocyanin and the greatest antioxidant activity. 'DOA green' and 'DOA Red' contained relatively higher percentage of crude protein. 'DOA Red' exhibited significantly longer shelf life under all three storage conditions. Polyethylene film packaging, combined with low temperature storage extended the keeping quality by 4.8 -8 fold in A. tricolor. 'Pure green' exhibited higher growth and yield performance and wider adaptability, hence it could be recommended for commercial cultivation.Index Terms-Amaranthus, antioxidant, leafy vegetables, shelf life. I. INTRODUCTIONLeafy vegetables are source of macro-and micronutrients that play a major role in maintaining healthy life. Daily dietary intake of leafy vegetables would help reducing the malnutrition problem since they provide essential minerals, vitamins and amino acids that are absent in the rice-based diet. They are less expensive and easily found in any part of this country compared to other vegetables. Amaranthus tricolor (Amaranth) is one of the popular leafy vegetables in Sri Lanka due to its easiness in culture, fast growth rate, In Sri Lanka, different selections of A. tricolor are cultivated by farmers, but very little information is available on their growth and yield performance, nutritional value and other quality characteristics. This may lead to cultivation of poor quality varieties with low yield [7]. Hence, several accessions of A. tricolor have been collected from farmer fields, purified and subjected to yield and quality evaluation at the Horticultural Crops Research and Development Institute (HORDI). To identify varieties with better adaptation to any particular location, it is important to compare the yield potential during different growing seasons. Together with morphological and ecological characterization and yield evaluation, antioxidant activity also can be used...

show abstract

Polyphenols in greenhouse and open-air-grown lettuce

Cited by 128 publications

References 20 publications

Metabolic profile of lettuce leaves by high-field NMR spectra

Metabolic profile of lettuce leaves by high-field NMR spectra

Silicon in the turgidity maintenance of American lettuce

Yield, Keeping Quality, Antioxidant Content and Some Nutritional Aspects of Selected Accessions of AmaranthusTricolor

Contact Info

Product

Resources

About