Multivariate detection limits of on-line NIR model for extraction process of chlorogenic acid from Lonicera japonica

2013 ◽  
Vol 77 ◽  
pp. 16-20 ◽  
Author(s):  
Zhisheng Wu ◽  
Chenglin Sui ◽  
Bing Xu ◽  
Lu Ai ◽  
Qun Ma ◽  
...  
Keyword(s):  
Chlorogenic Acid ◽  
Detection Limits ◽  
Extraction Process ◽  
Lonicera Japonica ◽  
On Line ◽  
Multivariate Detection

scholarly journals Validation of NIR Model for On-line Monitoring of Flos Lonicera Japonica Extraction Process with Different Batches of Materials

2013 ◽  
Vol 9 (4) ◽  
pp. 44 ◽  
Author(s):  
Chenglin Sui ◽  
Zhisheng Wu ◽  
Yanfang Peng ◽  
Luwei Zou ◽  
Yanling Pei ◽  
...  
Keyword(s):  
Extraction Process ◽  
Lonicera Japonica ◽  
On Line

Optimization of the Extraction Technology and Assessment of Antioxidant Activity of Chlorogenic Acid-Rich Extracts From Eucommia ulmoides Leaves

2021 ◽  
Vol 16 (10) ◽  
pp. 1934578X2110461
Author(s):  
Hua Jiang ◽  
Jun Li ◽  
Ning Zhang ◽  
Hai-Yang He ◽  
Jia-Min An ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Chlorogenic Acid ◽  
Ph Value ◽  
Extraction Process ◽  
Eucommia Ulmoides ◽  
Extraction Technology ◽  
Dpph Method ◽  
Contour Plots ◽  
Technology And Assessment ◽  
Design Optimum

Chlorogenic acid has been proved to have cardiovascular protection, antibacterial, antiviral, hemostatic, and hypolipidemia effects. Modern scientific research on the bioactivity of chlorogenic acid has been extended to the fields of food, medicine, health care and daily-use chemical industry. The aim of this research was to optimize the extraction conditions for chlorogenic acid from Eucommia ulmoides (Eucommiaceae) leaves. The significant variables were screened and optimized by a combination of Plackett-Burman test and Box-Behnken design. Optimum extraction parameters with ethanol concentration of 50%, solvent pH value of 3, and particle size of 60 mesh were determined according to variance analysis and contour plots. Under these conditions, the yield of chlorogenic acid was up to 4.36 mg/g, which was basically consistent with the theoretical prediction value of 4.50 mg/g. This study also proved the potential antioxidant activity of E. ulmoides leaves. The optimal extract of E. ulmoides leaves rich in chlorogenic acid showed the highest antioxidant activity in the FRAP method, which was 219.8 μM Trolox equivalents (TE) per g extract weight (EW) (μM TE/g EW). The DPPH method gave a similar value (168 μM TE/g EW) to the ABTS method (152 μM TE/g EW). The established extraction process was efficient in the recovery of chlorogenic acid from E. ulmoides leaves, encouraging its valorization as a cheap and sustainable alternative for the isolation of chlorogenic acid.

Trace Analysis and Speciation for Methylated Organotins by HPLC-Hydride Generation-Direct Current Plasma Emission Spectroscopy (HPLC-HY-DCP)

1985 ◽  
Vol 39 (6) ◽  
pp. 960-968 ◽  
Author(s):  
Ira S. Krull ◽  
Kenneth W. Panaro
Keyword(s):  
Direct Current ◽  
Emission Spectroscopy ◽  
High Performance ◽  
Hydride Generation ◽  
Detection Limits ◽  
Metal Species ◽  
Tuna Fish ◽  
Direct Current Plasma ◽  
Fish Samples ◽  
On Line

Total tin determinations can be accomplished at trace levels (10–25 ppb) by a continuous on-line hydride generation (HY), followed by direct current plasma (DCP) emission spectroscopy (HY-DCP). This approach is applicable for organotin compounds such as mono-, di-, and trimethyltin chloride, as well as stannous and stannic cations. HY-DCP methods of total tin analysis have been applied to a number of spiked and actual samples. Detection limits, calibration plots, sensitivities, and related analytical parameters have been evaluated. Organotin analysis and speciation can be accomplished by the interfacing of this HY-DCP step with high-performance liquid chromatography (HPLC), with the use of a polymeric PRP-1 type column with an acidic, ionic mobile phase, usually containing a suitable ion-pairing reagent. The overall speciation approach, HPLC-HY-DCP, has been evaluated with regard to separation conditions; detection limits; sensitivities; calibration plots; and applications to spiked water, clam juice, seawater, and tuna fish samples. The results suggest the suitability and reliability of this HPLC-HY-DCP approach for individual tin species. Other metal species capable of forming a hydride derivative on-line, in a continuous fashion, may also be suitable for speciation by HPLC-HY-DCP.

On-line SPE sample treatment as a tool for method automatization and detection limits reduction: Quantification of 25-hydroxyvitamin D3/D2

2017 ◽  
Vol 1043 ◽  
pp. 219-227 ◽  
Author(s):  
Dimitrios Palaiogiannis ◽  
Evangelia Bekou ◽  
Kalliopi Pazaitou-Panayiotou ◽  
Victoria Samanidou ◽  
Andreas Tsakalof
Keyword(s):  
Detection Limits ◽  
Sample Treatment ◽  
On Line
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