scholarly journals Quantification of water soluble vitamins in six date palm (Phoenix dactylifera L.) cultivar's fruits growing in Dubai, United Arab Emirates, through high performance liquid chromatography

2013 ◽  
Vol 17 (1) ◽  
pp. 9-16 ◽  
Author(s):  
Junaid Aslam ◽  
Sheba Haque Khan ◽  
Saeed Ahmad Khan
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
United Arab Emirates ◽  
High Performance ◽  
Date Palm ◽  
Phoenix Dactylifera ◽  
Water Soluble ◽  
Phoenix Dactylifera L

scholarly journals Chemical Characteristics, Antioxidant Activity, Total Phenol, and Caffeine Contents in Coffee of Date Seeds (Phoenix dactylifera L.) of Red Sayer Variety

2019 ◽  
Vol 8 (2) ◽  
pp. 179-184
Author(s):  
Siti Warnasih ◽  
◽  
Ade Heri Mulyati ◽  
Diana Widiastuti ◽  
Zuniar Subastian ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
United Arab Emirates ◽  
Date Palm ◽  
Natural Antioxidants ◽  
Phoenix Dactylifera ◽  
Total Sugar ◽  
Total Phenol ◽  
Chemical Characteristics ◽  
Phoenix Dactylifera L ◽  
Palm Juice

Red Sayer is one of the date varieties from the United Arab Emirates. This variety is one type of dates that is imported into Indonesia and used as processed date palm juice producing waste, namely date seeds. Date seeds can be made into some coffee that is rich in antioxidants and does not contain caffeine. The purpose of this study is to determine the chemical characteristics, antioxidant activity, total phenol, and caffeine contents in coffee of the Red Sayer variety date seeds. Coffee of date seeds is made into powder and then analyzed for its contents of water, ash, protein, fat, carbohydrates and total sugar, besides its antioxidant activity, total phenol, and caffeine levels. The results of the analysis obtained are, as follows: 4.42±0.01% water, 1.17±0.04% ash, 8.55±0.64% protein, 7.34±0.07% fat, 78.52±0.76% carbohydrate, 16.39±0.01% total sugar, 23.81±0.22 µg/mL antioxidant activity (IC50) and 340.65±1.53 mg GAE / 100g total phenol, while caffeine is not detected. Red Sayer date seed coffee, therefore, can be a source of carbohydrates and natural antioxidants that does not contain caffeine.

A Simple and Sensitive Dispersive Micro-Solid-Phase Extraction Coupled with High-Performance Liquid Chromatography for Quantification of Honokiol and Magnolol in Complex Matrices

2020 ◽  
Vol 103 (5) ◽  
pp. 1406-1411
Author(s):  
Chu Chu ◽  
Jing Li ◽  
Shan Wang ◽  
Lvnan Weng ◽  
Luyi Jiang ◽  
...  
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Solid Phase Extraction ◽  
High Performance ◽  
Solid Phase ◽  
Water Soluble ◽  
Phase Extraction ◽  
Patent Medicines ◽  
Chinese Patent

Abstract Background Honokiol and magnolol were considered as markers for the analysis of Cortex Magnoliae Officinalis, its related Chinese Patent Medicines and their metabolites. However, the determination of these two analytes in a water-soluble sample is difficult and therefore requires a more efficient method. Objective To develop a sensitive method for the determination of honokiol and magnolol in a water-soluble sample for better quality control of Cortex Magnoliae Officinalis and its related Chinese Patent Medicines. Method In this work, a combination of dispersive micro-solid-phase extraction (DMSPE) and high-performance liquid chromatography (HPLC) has been developed for simultaneous preconcentration and determination of honokiol and magnolol in complex bio-samples. Several experimental factors affecting the extraction efficiency were optimized by single factor test. Results Under the optimized extraction conditions, the proposed method exhibited good linearity of not less than 0.9998, satisfactory precision with relative standard deviation of less than 1.3%, and acceptable mean recoveries of 97.3% and 101.5% for honokiol and magnolol, respectively. Furthermore, the method exhibits extremely high sensitivity with detection limits of 0.0097 and 0.0231 ng/mL, which is even more sensitive than those methods developed by MS. Conclusions The method established in this study is fast, economic, accurate, easy to operate, and importantly well suited to the extraction and analysis of honokiol and magnolol in a real complex sample matrix.

Determination of water-soluble vitamins in infant milk by high-performance liquid chromatography

1997 ◽  
Vol 778 (1-2) ◽  
pp. 247-253 ◽  
Author(s):  
Soledad Albala´-Hurtado ◽  
M. Teresa Veciana-Nogue´s ◽  
Mari´a Izquierdo-Pulido ◽  
Abel Marine´-Font
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Performance ◽  
Water Soluble

scholarly journals Levoglucosan concentrations in ice-core samples from the Tibetan Plateau determined by reverse-phase high-performance liquid chromatography–mass spectrometry

2013 ◽  
Vol 59 (216) ◽  
pp. 599-612 ◽  
Author(s):  
Ping Yao ◽  
Valérie F. Schwab ◽  
Vanessa-Nina Roth ◽  
Baiqing Xu ◽  
Tandong Yao ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Tibetan Plateau ◽  
Biomass Burning ◽  
High Performance ◽  
Ice Core ◽  
Water Soluble ◽  
The Tibetan Plateau ◽  
Core Samples

AbstractLevoglucosan is a unique marker for biomass burning that can be transported in the atmosphere and preserved in archives such as ice cores. A new method to determine the concentrations of levoglucosan in Tibetan ice-core samples using high-performance liquid chromatography with electrospray ionization mass spectrometry (HPLC-ESI/MS) was developed. Levoglucosan was separated from coeluting water-soluble organic compounds using a C18 column with a gradient program from 50% to 90% methanol in ultrapure water. An external standard calibration curve (R2 = 0.9958) was established by plotting the ion m/z 163 [M+H]+ peak area versus the amount of analyte. The repeatability ranges between 11% and 2% at a concentration around 10 and 150 ng mL−1. The limit of detection was 10 ng mL−1 and the limit of quantification was 40 ng mL−1. Levoglucosan concentrations ranged from 10 to 718 ng mL−1 in the Muztagh Ata ice core and from 10 to 93 ng mL−1 in the Tanggula ice core. These concentrations, up to 1000 times higher than those measured in samples from Antarctic and Greenland, showed the higher vulnerability of the Tibetan Plateau glaciers to biomass burning events.

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