A comparative study of flavonoid contents and antioxidant activities of supercritical CO2 extracted pine barks grown in different regions of Turkey and Germany

Yeşil-Çeliktaş, Özlem; Otto, Frank; Parlar, Harun

doi:10.1007/s00217-009-1101-5

Cited by 34 publications

(28 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is worth to mention that the total phenol content and radical scavenging values were highly correlated with each other (r 5 0.85) which is in accordance with one of our previous studies as well [14]. RSM and in particular Box-Behnken method is capable of predicting the optimal conditions and calculating the maximum yields based on the responses, which were total phenol content and radical scavenging activity in this study.…”

Section: Optimization Of Sfesupporting

confidence: 91%

Effects of process parameters on supercritical CO₂ extraction of total phenols from strawberry (Arbutus unedo L.) fruits: An optimization study

Akay

Alpak

Yeşil-Çeliktaş

2011

J of Separation Science

View full text Add to dashboard Cite

The aim of this work was to optimize total phenolic yield of Arbutus unedo fruits using supercritical fluid extraction. A Box-Behnken statistical design was used to evaluate the effect of various values of pressure (50-300 bar), temperature (30-80°C) and concentration of ethanol as co-solvent (0-20%) by CO2 flow rate of 15 g/min for 60 min. The most effective variable was co-solvent ratio (p<0.005). Evaluative criteria for both dependent variables (total phenols and radical scavenging activity) in the model were assigned maximum. Optimum extraction conditions were elicited as 60 bar, 48°C and 19.7% yielding 25.72 mg gallic acid equivalent (GAE) total phenols/g extract and 99.9% radical scavenging capacity, which were higher than the values obtained by conventional water (24.89 mg/g; 83.8%) and ethanol (15.12 mg/g; 95.8%) extractions demonstrating challenges as a green separation process with improved product properties for industrial applications.

show abstract

Section: Optimization Of Sfesupporting

confidence: 91%

Effects of process parameters on supercritical CO₂ extraction of total phenols from strawberry (Arbutus unedo L.) fruits: An optimization study

Akay

Alpak

Yeşil-Çeliktaş

2011

J of Separation Science

View full text Add to dashboard Cite

show abstract

“…Five samples of four types of MOR = 3mgL 2ab 3 wood were tested; Maple, Red Oak, White Oak and Zebrano. Each sample was placed on the holder of a diffuse reflectance (DRIFT) optics attachment and presented such that a rough flat face was illuminated.…”

Section: Diffuse Reflectance Infrared Fourier Transform (Drift) Spectmentioning

confidence: 99%

“…This is mainly due to being non-toxic at low concentrations, non-flammable, inexpensive, inert and recyclable properties. CO 2 also holds a generally regarded as safe (GRAS) status [3] and is an environmentally friendly substitute for other organic solvents. Notably, CO 2 also has relatively low supercritical conditions: T c = 31.1 °C and P c = 7.38 MPa.…”

Section: Introductionmentioning

confidence: 99%

Hydrating softwood and hardwood samples using pure and modified supercritical carbon dioxide

Hammond

Cox

2017

Herit Sci

View full text Add to dashboard Cite

This article describes an in-progress research project that looks to investigate the use of supercritical carbon dioxide (scCO 2 ) for the addition of water to historic and modern, softwood and hardwood samples. The experiments were carried out at 20 MPa and 50 °C, the effects of co-solvent addition, methanol (MeOH), were examined. A three point bend test provided mechanical data for the wood samples treated with both pure and modified scCO 2 . All the wood samples, with only one exception, saw an increase in Modulus of Rupture (MOR) after being treated with scCO 2 . Thereby indicating an increased resistance to force in the treated samples. Diffuse Reflectance Infrared Fourier Transform (DRIFT) spectroscopy was performed to help deduce if any trends in the OH/CH and OH/Cellulose peak area ratios could be established with the nature of the treatment and the type of wood used. The development of this technique seeks to be relevant and safe for applications within modern conservation practices, where dry and fragile materials are prevalent.

show abstract

“…The total phenols in the extracts were determined by FolinCiocalteu method [10]. Briefly, 100 ll aliquot of the extract was added into a tube containing Milli-Q water (final volume 10 ml).…”

Section: Antioxidant Activity Assaymentioning

confidence: 99%

Supercritical CO2 extraction of Alkanna species and investigating functional characteristics of alkannin-enriched yoghurt during storage

Pilavtepe

Erkucuk

Akgün

et al. 2012

Eur Food Res Technol

View full text Add to dashboard Cite

Alkannin is a potent pharmaceutical substance with a wide spectrum of biological activities. In the scope of this study, supercritical CO 2 extraction and sonication with hexane were applied to various Alkanna species, which were then subjected to hydrolysis. Total alkannins were quantified by HPLC/DAD and incorporated into yoghurt. Viscosities, pH values and microbial analyses were reported at 7 days of intervals for 21 days of storage. A. tinctoria possessed the highest amounts of alkannins and total phenols (686.3 mg GAE/g extract). The results revealed no significant changes in pH values (4.1-4.0), viable counts of Streptococcus salivarius ssp. thermophilus (80-150 9 10 6 cfu g -1 ) and slightly lower viscosities of enriched yoghurts (8,250-6,750 cPs) compared with the control (4.15-4.0; 110-105 9 10 6 cfu g -1 ; 12,600-11,310 cPs) during storage. However, viable counts of Lactobacillus delbrueckii ssp. bulgaricus of enriched yoghurts (87 9 10 3 cfu g -1 ) were much better than the control (191 9 10 3 cfu g -1 ), indicating a significant decrease in post acidification and generation of bitter peptides. Among the species investigated, A. tinctoria is the most promising source, obtained at higher yields via supercritical fluid extraction technology as a green alternative to solvent extraction and thus can be utilized at industrial scale in order to develop yoghurt products with improved health benefits.

show abstract

A comparative study of flavonoid contents and antioxidant activities of supercritical CO2 extracted pine barks grown in different regions of Turkey and Germany

Cited by 34 publications

References 23 publications

Effects of process parameters on supercritical CO₂ extraction of total phenols from strawberry (Arbutus unedo L.) fruits: An optimization study

Effects of process parameters on supercritical CO₂ extraction of total phenols from strawberry (Arbutus unedo L.) fruits: An optimization study

Hydrating softwood and hardwood samples using pure and modified supercritical carbon dioxide

Supercritical CO2 extraction of Alkanna species and investigating functional characteristics of alkannin-enriched yoghurt during storage

Contact Info

Product

Resources

About

A comparative study of flavonoid contents and antioxidant activities of supercritical CO2 extracted pine barks grown in different regions of Turkey and Germany

Cited by 34 publications

References 23 publications

Effects of process parameters on supercritical CO2 extraction of total phenols from strawberry (Arbutus unedo L.) fruits: An optimization study

Effects of process parameters on supercritical CO2 extraction of total phenols from strawberry (Arbutus unedo L.) fruits: An optimization study

Hydrating softwood and hardwood samples using pure and modified supercritical carbon dioxide

Supercritical CO2 extraction of Alkanna species and investigating functional characteristics of alkannin-enriched yoghurt during storage

Contact Info

Product

Resources

About

Effects of process parameters on supercritical CO₂ extraction of total phenols from strawberry (Arbutus unedo L.) fruits: An optimization study

Effects of process parameters on supercritical CO₂ extraction of total phenols from strawberry (Arbutus unedo L.) fruits: An optimization study