Evaluation of quality properties and antioxidant activities of tiger nut (Cyperus esculentus L.) oil produced by mechanical expression or/with critical fluid extraction

LWT ◽  
2021 ◽  
Vol 141 ◽  
pp. 110915
Author(s):  
Tingting Guo ◽  
Chuyun Wan ◽  
Fenghong Huang ◽  
Chunlei Wei
Keyword(s):  
Antioxidant Activities ◽  
Cyperus Esculentus ◽  
Fluid Extraction ◽  
Quality Properties ◽  
Mechanical Expression

Optimization of Supercritical Fluid Extraction of Phenolic Compounds from Peach Blossom (Amygdalus Persica) by Response Surface Methodology

2018 ◽  
Vol 17 (2) ◽  
pp. 180-187
Author(s):  
Yang Wen-Bo ◽  
Liu Jie-Chao ◽  
Liu Hui ◽  
Zhang Chun-Ling ◽  
Lv Zhen-Zhen ◽  
...  
Keyword(s):  
Response Surface Methodology ◽  
Phenolic Compounds ◽  
Response Surface ◽  
Supercritical Fluid Extraction ◽  
Supercritical Fluid ◽  
Antioxidant Activities ◽  
Total Phenolic ◽  
Fluid Extraction ◽  
Phenolic Contents ◽  
C 30

Supercritical fluid extraction (SFE) was used for the extraction of phenolic compounds from peach blossom (Amygdalus persica). The optimum conditions of SFE were optimized by response surface methodology and confirmed at 64°C, 30 MPa, 143 min, and 35 mL ethanol (100%) as modifier for maximum total phenolic contents (54.10 mg GAE g−1 DW), which was higher than the yield achieved by ultrasonic-assisted extraction (44.04 mg GAE g−1 DW). The antioxidant activities and tyrosinase inhibitory activities of extraction extracted by SFE were 79.55% and 14.42%. Furthermore, chlorogenic acid, quercetin-3-O-galactoside, kaempferol-3-O-galactoside, quercitrin-3-O-rhamnoside, and kaempferol 4′-glucoside were identified in this study.

Effects of Vacuum Ohmic Evaporation on Some Quality Properties of Sour Cherry Juice Concentrates

2019 ◽  
Vol 15 (9) ◽  
Author(s):  
Serdal Sabancı ◽  
Filiz Icier
Keyword(s):  
Antioxidant Activities ◽  
Sour Cherry ◽  
Absolute Pressure ◽  
Total Phenolic ◽  
Voltage Gradient ◽  
Anthocyanin Content ◽  
Quality Properties ◽  
Significant Difference ◽  
Cherry Juice ◽  
Total Antioxidant

AbstractSour cherry juice (SJ) having total soluble solid (TSS) content of 19.2 % was concentrated to 65 % TSS by applying vacuum ohmic evaporation (VOE) and vacuum evaporation (VE) methods under constant absolute pressure (25 kPa). Total monomeric anthocyanin content (TMAC) of sour cherry concentrate (65 % TSS) was found in the range of 1561.67–1777.38 mg/L whereas total phenolic content (TPC) varied in the range of 9,071.22–78,347.53 mg/L concentrate. TPC and TMAC values of juice concentrates were affected less from VOE process compared to VE (p < 0.05) while there was no significant difference between the total antioxidant activities of SJ concentrates obtained by both methods (p > 0.05). TMAC and TPC values increased as the voltage gradient applied increased (p < 0.05). VOE process preserved the color properties of juice concentrates better compared to the VE process. It was concluded that VOE method could be an alternative fast evaporation method to obtain high-quality fruit juice concentrates.

Optimization of Supercritical Fluid Extraction of Antioxidant Compounds from Venezuelan Rosemary Leaves

2012 ◽  
Vol 8 (4) ◽  
Author(s):  
Gabriela Caldera ◽  
Yalitza Figueroa ◽  
Maritza Vargas ◽  
Diego T. Santos ◽  
Germania Marquina-Chidsey
Keyword(s):  
Antioxidant Activity ◽  
Supercritical Fluid Extraction ◽  
Supercritical Fluid ◽  
Antioxidant Activities ◽  
Extraction Time ◽  
Carnosic Acid ◽  
Antioxidant Compounds ◽  
Extraction Temperature ◽  
Fluid Extraction ◽  
Static Extraction

Abstract The extraction of the antioxidant compounds from rosemary can be achieved by means of various processes, such as hydrodistillation, soxhlet extraction, microwave-accelerated hydrodistillation (MAHD) and supercritical fluid extraction (SFE). The aim of our study was to optimize SFE variables such as extraction pressure, extraction temperature and static extraction time for the maximum extraction of carnosol and carnosic acid from Venezuelan rosemary (Rosmarinus officinalis L.) leaves by using 23 full factorial and Box-Behnken designs and Response Surface Methodology (RSM). The chemical characterization of the supercritical fluid extracts was achieved by high-performance liquid chromatography (HPLC), and the antioxidant activity was determined by the peroxide index assay. For the extraction of carnosol, the variables of extraction temperature and static extraction time were statistically significant, and for the extraction of carnosic acid, only the extraction temperature-static extraction time interaction was significant. At a fixed pressure, the highest extraction of carnosol and carnosic acid were achieved when the operational extraction conditions of extraction temperature and static extraction time were set at 48°C for 69 min and 64°C for 57 min, respectively. SFE extracts presented higher antioxidant activities than commercial and soxhlet extracts, and pure dibutyl hidroxytoluene (BHT). Since the carnosic acid/carnosol ratios presented in our SFE extracts are higher than those from other countries, possibly it would be expected that higher antioxidant activity values would be obtained for the Venezuelan extracts.

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