Sample Preparation Methods for the Determination of the Antioxidative Capacity of Apple Juices

Cindrić, Iva Juranović; Kunštić, Martina; Zeiner, Michaela; Stingeder, Gerhard; Rusak, Gordana

doi:10.5562/cca1756

Cited by 22 publications

(7 citation statements)

References 11 publications

(11 reference statements)

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“…The pH was measured with a pH meter (HANNA, HI 83141, HANNA INSTRUMENTS HELLAS, Athens, Greece). Phenols' concentration was measured according to Cindric et al [27]. Klason lignin content was determined according to the Laboratory Analytical Procedure (LAP) [28].…”

Section: Methodsmentioning

confidence: 99%

Biogas Production from Sunflower Head and Stalk Residues: Effect of Alkaline Pretreatment

et al. 2019

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Sunflower residues are considered a prominent renewable source for biogas production during anaerobic digestion (AD). However; the recalcitrant structure of this lignocellulosic substrate requires a pretreatment step for efficient biomass transformation and increased bioenergy output. The aim of the present study was to assess the effect of alkaline pretreatment of various parts of the sunflower residues (e.g., heads and stalks) on their methane yield. Experimental data showed that pretreatment at mild conditions (55 °C; 24 h; 4 g NaOH 100 g−1 total solids) caused an increase in the biochemical methane potential (BMP) of both heads and stalks of the sunflower residues as determined in batch tests. The highest methane production (268.35 ± 0.11 mL CH4 g−1 volatile solids) was achieved from the pretreated sunflower head residues. Thereafter; the effect of alkaline pretreatment of sunflower head residues was assessed in continuous mode; using continuous stirred-tank reactors (CSTRs) under two operational phases. During the first phase; the CSTRs were fed with the liquid fraction produced from the pretreatment of sunflower heads. During the second phase; the CSTRs were fed with the whole slurry resulting from the pretreatment of sunflower heads (i.e., both liquid and solid fractions). In both operating phases; it was observed that the alkaline pretreatment of the sunflower head residues had a negligible (phase I) or even a negative effect on biogas production; which was contradictory to the results of the BMP tests. It seems that; during alkaline pretreatment; this part of the sunflower residues (heads) may release inhibitory compounds; which induce a negative effect on biogas production in the long term (e.g., during continuously run digesters such as CSTR) but not in the short-term (e.g., batch tests) where the effect of the inoculum may not permit the inhibition to be established.

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Section: Methodsmentioning

confidence: 99%

Biogas Production from Sunflower Head and Stalk Residues: Effect of Alkaline Pretreatment

et al. 2019

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“…To estimate the presence of grape polyphenols in the hippocampus, the total phenolic content was measured spectrophotometrically using Folin Ciocalteu’s method ( Iva Juranovic Cindric, 2011 ).…”

Section: Methodsmentioning

confidence: 99%

Modulating Oxidative Stress Relieves Stress-Induced Behavioral and Cognitive Impairments in Rats

Solanki

Salvi

Patki

et al. 2017

International Journal of Neuropsychopharmacology

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Background:Persistent psychological stress often leads to anxiety disorders and depression. Benzodiazepines and selective serotonin reuptake inhibitors are popular treatment options but have limited efficacy, supporting the need for alternative treatment. Based on our recent preclinical work suggesting a causal link between neurobehavioral deficits and elevated oxidative stress, we hypothesized that interventions that mitigate oxidative stress can attenuate/overcome neurobehavioral deficits.Methods:Here, we employed the rat social defeat model of psychological stress to determine whether increasing antioxidant levels using grape powder would prevent and/or reverse social defeat-induced behavioral and cognitive deficits. Furthermore, a hippocampal-derived HT22 cell culture model of oxidative stress was employed to identify the individual beneficial constituent(s) of grape powder and the underlying mechanism(s) of action.Results:Grape powder treatment prevented and reversed social defeat-induced behavioral and cognitive deficits and also decreased social defeat-induced increase in plasma corticosterone and 8-isoprostane (systemic and oxidative stress markers, respectively). And grape powder treatment replenished social defeat-induced depleted pool of key antioxidant enzymes glyoxalase-1, glutathione reducatse-1, and superoxide dismutase. Grape powder constituents, quercetin and resveratrol, were most effective in preventing oxidative stress-induced decreased cellular antioxidant capacity. Grape powder protected oxidative stress-induced cell death by preventing calcium influx, mitochondrial dysfunction, and release of cytochrome c.Conclusions:Grape powder treatment by increasing antioxidant pool and preventing cell damage and death prevented and reversed social defeat-induced behavioral and cognitive deficits in rats. Quercetin and resveratrol are the major contributors towards beneficial effects of grape powder.

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“…Total phenols, total tannins and condensed tannin contents in A. paniculata leaves were determined according to the method of Cindrić et al (2011) andMakkar (2003). Ash, organic matter (OM), crude protein (CP) and ether extract (EE) contents were determined following the method of AOAC (2005).…”

Section: Chemical Analysismentioning

confidence: 99%

Effects of Harvesting Time on Tannin Biological Activity in Sambiloto (Andrographis paniculata) Leaves and In vitro Diet Digestibility Supplemented with Sambiloto Leaves

Priyoatmojo¹,

Maharani²,

Ansori³

et al. 2021

JAHP

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This study investigated the effect of harvesting time on concentration and biological activity of tannin in Andrographis paniculata (A. paniculata) leaves and determined the in vitro rumen fermentation and digestibility of diet supplemented with A. paniculata leaves to evaluate its role as herbal supplement in ruminant's feed. A. paniculata leaves were harvested at two time points i.e., before and after flowering phase and the samples were dried to analyze concentration and biological activity of tannin. Rice straw was used as basal diet to carry out in vitro digestibility trial. Four treatments were used including B consisting basal diet only, BBF and BAF each consisting basal diet supplemented with 1% A. paniculata leaves before and after flowering phases, respectively, and BBAF supplemented with 0.5% A. paniculata leaves before and 0.5% after flowering phase. Each treatment was carried out in five replications. Results revealed that contents (mg/g) for total tannin (20.40±1.06 vs 19.33±1.19; P<0.05) and condensed tannin (8.44±0.17 vs 5.47±0.30; P<0.01) were greater in leaves harvested after flowering compared with before flowering phase, however, no significant difference (P > 0.05) on biological activity of tannins was observed between the two flowering phases. The in vitro gas production was not influenced (P > 0.05) by the supplementation of A. paniculata leaves before and after flowering phase. A. paniculata supplementation also did not influence (P > 0.05) in vitro organic matter digestibility (IVOMD) and total volatile fatty acids (TVFA) values. It was concluded that the supplementation of A. paniculata leaves before and after flowering phase in the diet does not affect the digestibility.

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Sample Preparation Methods for the Determination of the Antioxidative Capacity of Apple Juices

Cited by 22 publications

References 11 publications

Biogas Production from Sunflower Head and Stalk Residues: Effect of Alkaline Pretreatment

Biogas Production from Sunflower Head and Stalk Residues: Effect of Alkaline Pretreatment

Modulating Oxidative Stress Relieves Stress-Induced Behavioral and Cognitive Impairments in Rats

Effects of Harvesting Time on Tannin Biological Activity in Sambiloto (Andrographis paniculata) Leaves and In vitro Diet Digestibility Supplemented with Sambiloto Leaves

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