Antioxidant Activity of Extracts from Apple, Chokeberry and Strawberry.

Bonarska-Kujawa, Dorota; Sarapuk, Janusz; Bielecki, Krzysztof; Oszmiański, Jan; Kleszczyńska, Halina

doi:10.2478/v10222-012-0055-7

Cited by 12 publications

(10 citation statements)

References 18 publications

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“…When oxidation was induced with AAPH, the hawthorn leaf extract was applied at concentrations of 2.0–5.0 μg ml −1 and the bark extract at 1.0–3.5 μg ml −1 . Relative fluorescence decreases with time of oxidation and concentration, the decrease being slower as the extract concentration increases (Bonarska-Kujawa et al 2012). To compare the antioxidant activity of the substances, like in the spectrophotometric method, the IC 50 values were determined and, together with those of Trolox, are given in Table 2.…”

Section: Resultsmentioning

confidence: 99%

Activity of Hawthorn Leaf and Bark Extracts in Relation to Biological Membrane

et al. 2013

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The aim of the study was to identify and determine the percent content of polyphenols in extracts from leaves and hawthorn bark, to examine the effect of the extracts on the properties of the biological membrane as well as to determine their antioxidant activity toward membrane lipids. In particular, a biophysical investigation was conducted on the effect of hawthorn extracts on the osmotic resistance and morphology of erythrocyte cells and on the packing of the heads of membrane lipids. Analysis of the polyphenol content of extracts used the HPLC method. Analysis of the polyphenol composition has shown a dominant share of procyanidins and epicatechin in both extracts. The research showed that the polyphenolic compounds contained in hawthorn extracts are incorporated mainly into the hydrophilic part of the erythrocyte membrane, inducing echinocyte shapes. They also diminish the packing order of the lipid polar heads of the membrane, as evidenced by the lowered generalized polarization values of Laurdan. The substances used induced increased osmotic pressure of erythrocytes, making them less sensitive to changes in osmotic pressure. The presence of the extract compounds in the outer hydrophilic part of the erythrocyte membrane, evidenced by examination of the shapes and packing in the hydrophilic part of membrane, indicates that the substances constitute a kind of barrier that protects the erythrocyte membrane against free radicals, while the membrane-bound extracts do not disturb the membrane structure and, thus, do not cause any side effects.

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Section: Resultsmentioning

confidence: 99%

Activity of Hawthorn Leaf and Bark Extracts in Relation to Biological Membrane

et al. 2013

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“…is one of the most popular summer fruit and is known for its taste and fl avor. It is a rich source of fl avonoids, especially anthocyanins, as well as vitamins, minerals and amino acids that have a benefi cial effect on health [Bonarska- Kujawa et al, 2012]. However, strawberries are highly delicate and perishable fruits, which results in their short post-harvest shelf-life due to mechanical injury, water loss, physiological disorders, high respiration rate, off--fl avors, and textural losses [Vargas et al, 2006].…”

Section: Introductionmentioning

confidence: 99%

Improving Storability of Strawberries with Gaseous Chlorine Dioxide in Perforated Clamshell Packaging

Chiabrando¹,

Giuggioli²,

Maghenzani³

et al. 2018

Pol. J. Food Nutr. Sci.

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A chlorine dioxide generating pad has been used as postharvest treatment to maintain the quality and safety of strawberries in two different storage conditions. During the short storage time (3 days at 4°C + 2 days at 20°C) fruit treated with ClO 2 maintained better quality parameters, as color, titratable acidity, total soluble solids, anthocyanins, antioxidant capacity and lower values of weight loss. During the long storage time (12 days at 2°C), the parameters related to postharvest quality were generally preserved and the effect of ClO 2 was positive to reduce the total yeast and mold, except the last period of the experiment when the ClO 2 gas-generating pad was probably exhausted. The sensory evaluation revealed that the sanitization with ClO 2 maintained a global positive acceptance in particular during the short storage time. The results suggest that this treatment may be suitable to maintain the quality during short storage and long storage until 8 days and it may be an important alternative sanitizer thanks to the positive action against the yeast and mold without modifying the quality of the strawberries. Unauthenticated Download Date | 5/8/18 8:11 PM

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“…The biological properties of CGA are primarily attributed to its capacity to donate hydrogen atoms of the phenolic ring to free radicals, thus inhibiting oxidation process [7]. Research confirms that CGA, among the polyphenol compounds that occur in plants, is an important natural antioxidant [5,6,[8][9][10][11][12]. The polyphenols are scavengers of free radicals which are responsible for oxidizing biological structures, with resultant damage and pathological states of an organism.…”

Section: Introductionmentioning

confidence: 99%

Effect of chlorogenic acid on the phase transition in phospholipid and phospholipid/cholesterol membranes

Pruchnik

Bonarska-Kujawa

Kleszczyńska

2014

J Therm Anal Calorim

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Chlorogenic acid (CGA) is present in many plants, especially in green coffee, dry plums, and bilberries. It is an important bioactive polyphenol. Studies showed that CGA has an antioxidative, bacteriostatic, anticancer, antiviral, and anti-inflammatory activity. Despite great interest in this compound, its interaction with the lipid model membrane has not yet been investigated. To better understand the relationship between the biological activity of CGA and its interaction with biological membranes, the thermotropic behavior of model lipid membranes was investigated. The effect of CGA on the model lipid membrane, specifically on the lipid bilayer phase transitions, was examined by the combined methods: differential scanning calorimetry and fluorescence spectroscopy. In particular, the degree of packing order of the hydrophilic phase of the lipid bilayer was determined using the fluorimetric method with Laurdan and Prodan probes, while the fluorescence anisotropy of the hydrophobic phase with the DPH and TMA-DPH probes. The results of the study show that CGA incorporates mainly into the hydrophilic part of membrane, changing the packing order of the polar heads of lipids. No significant changes were recorded in membrane fluidity of the hydrophobic membrane region, for the fluorescence anisotropy practically did not change. One can thus infer that CGA does not penetrate deep into the hydrophobic area of the membrane.

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Antioxidant Activity of Extracts from Apple, Chokeberry and Strawberry.

Cited by 12 publications

References 18 publications

Activity of Hawthorn Leaf and Bark Extracts in Relation to Biological Membrane

Activity of Hawthorn Leaf and Bark Extracts in Relation to Biological Membrane

Improving Storability of Strawberries with Gaseous Chlorine Dioxide in Perforated Clamshell Packaging

Effect of chlorogenic acid on the phase transition in phospholipid and phospholipid/cholesterol membranes

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