scholarly journals Influence of the Lignin Extraction Methods on the Content of Tricin in Grass Lignins

2021 ◽  
Vol 9 ◽  
Author(s):  
Minting Xie ◽  
Zhendong Chen ◽  
Yue Xia ◽  
Minsheng Lin ◽  
Jiaqi Li ◽  
...  
Keyword(s):  
Quantum Correlation ◽  
High Performance ◽  
Extraction Methods ◽  
Biological Properties ◽  
Uv Resistance ◽  
Alternative Source ◽  
Organosolv Lignin ◽  
Lignin Extraction ◽  
Quantitative Results

Tricin as a monomer of grass lignin with unique biological properties is beneficial to human health with the potential for various applications. The abundant grass lignin could be an alternative source for tricin if an effective separation method is available. In this study, we used different lignin preparations, including alkali lignin (AL), mild acidolysis lignin (MAL), cellulase enzymatic lignin (CEL), γ-valerolactone lignin (GVL), and organosolv lignin (OL), to investigate the effect of different fractionation methods on the tricin content of the wheat straw lignin. The tricin signal of different lignins can be clearly identified by 2D heteronuclear singular quantum correlation (HSQC) spectra. GVL showed the highest tricin level among these lignin samples as the tricin content of GVL was accounted to be 8.6% by integrals. The tricin content was carefully determined using thioacidolysis combined with high-performance liquid chromatography-mass spectrometric (HPLC-MS), and the quantitative results of tricin by HPLC-MS were basically consistent with that of 2D HSQC integrals. Both methods have proved that the tricin contents of lignins isolated under acid conditions were significantly higher than that of AL. In addition, the determination of the sun protection factors (SPF) of lignin-based sunscreen and antioxidant activity of lignin preparations indicated that reserving more tricin was beneficial to the UV resistance of lignin samples. Therefore, this study not only provides new insights for the extraction methods of lignin with high tricin content but also is beneficial to the future study on the application of tricin and tricin-lignin.

Q-marker Prediction Analysis of Rhubarb in Fengyin Decoction Based on Fingerprint and Network Pharmacology

2021 ◽  
Vol 16 (8) ◽  
pp. 1934578X2110387
Author(s):  
Ji-le Lan ◽  
Ye-ping Ruan ◽  
Zhu-jun Mao ◽  
Li-yan You ◽  
Zhong Chen
Keyword(s):  
Chinese Medicine ◽  
High Performance ◽  
Active Component ◽  
Extraction Methods ◽  
Network Pharmacology ◽  
Active Components ◽  
Quality Marker ◽  
Core Components ◽  
Aloe Emodin

Fengyin Decoction (FYD) is a traditional Chinese medicine for the treatment of epilepsy and wind paralysis. However, the potential antiepileptic active component in rhubarb (which is the most effective Chinese medicine in FYD) has not been defined. In this study, we analyzed and predicted the potential quality marker (Q-marker) of rhubarb in FYD based on fingerprint and network pharmacology. The fingerprints of FYD and rhubarb were established to analyze the transmission law of active components. Ultra-high performance liquid chromatography (UPLC) was used to study quantitatively the active components obtained by different extraction methods of FYD. Combined with network pharmacological analysis, a “components-targets-pathways” network was constructed to predict the potential Q-marker. Eight peaks were identified by FYD fingerprint: aloe-emodin, rhein, emodin, chrysophanol, physcion, cinnamaldehyde, 6-gingerol, and glycyrrhizic acid ammonium salt. The determination of the 8 active components in FYD with different extraction methods suggested that rhubarb anthraquinone may be a potential antiepileptic active component. Twelve core components, 19 targets, and 21 pathways of rhubarb were screened by network pharmacology, which further demonstrated that rhubarb played a role mainly through these components, targets, and pathways. We preliminarily predicted that compounds such as rhubarb anthraquinones were a potential Q-marker. The UPLC fingerprint and the content determination method of the 8 components established in this study were effective and feasible. The findings in this study may provide a reference for further study of quality control of FYD and lay a theoretical foundation for the study of its action mechanism. In addition, our study may provide a novel idea for the study of the Q-marker of other classical compound traditional Chinese medicines.

scholarly journals A Review of the Analytical Methods for the Determination of 4(5)-Methylimidazole in Food Matrices

Chemosensors ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 322
Author(s):  
Panagiota-Kyriaki Revelou ◽  
Marinos Xagoraris ◽  
Eleftherios Alissandrakis ◽  
Christos S. Pappas ◽  
Petros A. Tarantilis
Keyword(s):  
Mass Spectrometry ◽  
Analytical Methods ◽  
High Performance ◽  
Water Solubility ◽  
Solid Phase ◽  
Sample Pretreatment ◽  
Extraction Methods ◽  
Exchange Chromatography ◽  
Food Matrices

4(5)-Methylimidazole (4(5)MEI) is a product of the Maillard reaction between sugars and amino acids, which occurs during the thermal processing of foods. This compound is also found in foods with caramel colorants additives. Due to its prevalence in foods and beverages and its potent carcinogenicity, 4(5)MEI has received federal and state regulatory agency attention. The aim of this review is to present the extraction procedures of 4(5)MEI from food matrices and the analytical methods for its determination. Liquid and gas chromatography coupled with mass spectrometry are the techniques most commonly employed to detect 4(5)MEI in food matrices. However, the analysis of 4(5)MEI is challenging due to the high polarity, water solubility, and the absence of chromophores. To overcome this, specialized sample pretreatment and extraction methods have been developed, such as solid-phase extraction and derivatization procedures, increasing the cost and the preparation time of samples. Other analytical methods for the determination of 4(5)MEI, include capillary electrophoresis, paper spray mass spectrometry, micellar electrokinetic chromatography, high-performance cation exchange chromatography, fluorescence-based immunochromatographic assay, and a fluorescent probe.

scholarly journals Phytochemical Profile and Biological Properties of Colchicum triphyllum (Meadow Saffron)

Foods ◽  
2020 ◽  
Vol 9 (4) ◽  
pp. 457 ◽  
Author(s):  
Biancamaria Senizza ◽  
Gabriele Rocchetti ◽  
Murat Ali Okur ◽  
Gokhan Zengin ◽  
Evren Yıldıztugay ◽  
...  
Keyword(s):  
High Performance ◽  
Biological Activities ◽  
Reducing Power ◽  
Extraction Methods ◽  
Biological Properties ◽  
Leaf Extracts ◽  
Antioxidant Power ◽  
Phytochemical Profile ◽  
First Time

In this work, the phytochemical profile and the biological properties of Colchicum triphyllum (an unexplored Turkish cultivar belonging to Colchicaceae) have been comprehensively investigated for the first time. Herein, we focused on the evaluation of the in vitro antioxidant and enzyme inhibitory effects of flower, tuber, and leaf extracts, obtained using different extraction methods, namely maceration (both aqueous and methanolic), infusion, and Soxhlet. Besides, the complete phenolic and alkaloid untargeted metabolomic profiling of the different extracts was investigated. In this regard, ultra-high-performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry (UHPLC-QTOF-MS) allowed us to putatively annotate 285 compounds when considering the different matrix extracts, including mainly alkaloids, flavonoids, lignans, phenolic acids, and tyrosol equivalents. The most abundant polyphenols were flavonoids (119 compounds), while colchicine, demecolcine, and lumicolchicine isomers were some of the most widespread alkaloids in each extract analyzed. In addition, our findings showed that C. triphyllum tuber extracts were a superior source of both total alkaloids and total polyphenols, being on average 2.89 and 10.41 mg/g, respectively. Multivariate statistics following metabolomics allowed for the detection of those compounds most affected by the different extraction methods. Overall, C. triphyllum leaf extracts showed a strong in vitro antioxidant capacity, in terms of cupric reducing antioxidant power (CUPRAC; on average 96.45 mg Trolox Equivalents (TE)/g) and ferric reducing antioxidant power (FRAP) reducing power (on average 66.86 mg TE/g). Interestingly, each C. triphyllum methanolic extract analyzed (i.e., from tuber, leaf, and flower) was active against the tyrosinase in terms of inhibition, recording the higher values for methanolic macerated leaves (i.e., 125.78 mg kojic acid equivalent (KAE)/g). On the other hand, moderate inhibitory activities were observed against AChE and α-amylase. Strong correlations (p < 0.01) were also observed between the phytochemical profiles and the biological activities determined. Therefore, our findings highlighted, for the first time, the potential of C. triphhyllum extracts in food and pharmaceutical applications.

Simplified micro-scale procedure for preparing samples for theophylline determination by liquid chromatography.

1977 ◽  
Vol 23 (1) ◽  
pp. 124-126 ◽  
Author(s):  
J W Nelson ◽  
A L Cordry ◽  
C G Aron ◽  
R A Bartell
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
High Performance ◽  
Standard Sample ◽  
Retention Volume ◽  
Internal Standard ◽  
Reverse Phase ◽  
Micro Scale ◽  
Quantitative Results

Abstract We describe an improved procedure for the preparation of plasma or serum for determination of theophylline by reverse phase high-performance liquid chromatography. Quantitative results are available in less than 30 min from receipt of sample. The chromatogram is complete in 8 to 16 min, which includes the use of an internal standard. Sample preparation consists of simple solvent denaturation of the sample proteins, and centrifugation to remove protein before chromatography. No precolumn is required to pretect the separating column. No interference was noted when sodium or lithium heparin or ethylenediaminetetraacetate were used as anticoagulants, but citrate treatment proved to be unsatisfactory because of a highly absorbing band that eluted with the same retention volume as theophylline.

scholarly journals Evaluation of the Analytical Conditions for the Determination of Chlorogenic Acid in Coffee Silverskin

2019 ◽  
Author(s):  
Elisa A. Beltrán-Medina ◽  
Guadalupe M. Guatemala-Morales ◽  
Rosa I. Corona-González ◽  
Eduardo Padilla-Camberos ◽  
Pedro M. Mondragón-Cortez ◽  
...  
Keyword(s):  
Chlorogenic Acid ◽  
Extraction Methods ◽  
Biological Properties ◽  
Acid Extraction ◽  
Coffee Silverskin ◽  
Glucose And Lipid Metabolism ◽  
Method Of Extraction ◽  
By Products ◽  
Instrument Detection Limit

Chlorogenic acid or 5-Caffeoylquinic acid is a polyphenolic component present in coffee and its by-products. Chlorogenic acid has been shown to exert biological properties, particularly in relation to glucose and lipid metabolism, including antibacterial, antioxidant, anti-inflammatory activities, among others. Due to its importance, it is necessary to evaluate the reliability of the analytical method for its determination in complex matrices such as food. In this work, different methods of chlorogenic acid extraction in coffee Silverskin were studied, as well as its quantification by HPLC. The results showed that the method of extraction with a mixture of methanol:water (3:1 v/v) in an ultrasonic bath, favored the recovery of chlorogenic acid with a recovery of 77.44%. The instrument detection limit for chlorogenic acid was 3.311 &micro;g/mL and the quantification limit was 11.037 &micro;g/mL. For coffee Silverskin, the concentration obtained of chlorogenic acid by the three extraction methods evaluated was in the range of 57 to 224 mg/kg of coffee silverskin (dry basis).

scholarly journals Comparison of pressurised fluid and ultrasonic extraction methods for analysis of plant antioxidants and their antioxidant capacity

2010 ◽  
Vol 8 (1) ◽  
pp. 87-95 ◽  
Author(s):  
Petr Dobiáš ◽  
Petra Pavlíková ◽  
Martin Adam ◽  
Aleš Eisner ◽  
Blanka Beňová ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Plant Material ◽  
High Performance ◽  
Extraction Methods ◽  
Ultrasonic Extraction ◽  
Dpph Radical ◽  
Limit Of Quantification ◽  
Plant Antioxidants ◽  
Real Plant

AbstractThe analytical method based on the high-performance liquid chromatography coupled with UV detection (HPLC/UV) for determination of selected antioxidants (i.e., esculetin, scopoletin, 7-hydroxycoumarine, rutin, xanthotoxin, 5-methoxypsoralen and quercetin) in plant material was developed. Pressurised fluid extraction (PFE) and ultrasonic extraction (USE) methods for the isolation of these compounds from ten real plant samples were used. Both extraction methods were optimised and compared to each other. For the proposed HPLC/UV method the LOQ values (limit of quantification) in the range from 22.7 (xanthotoxin) to 97.2 ng mL−1 (rutin) were obtained. For all extracts the antioxidant capacity based on the reduction of free 2,2-diphenyl-1-picrylhydrazyl radical (DPPH) was also determined. Results ranged from 82.04 to 94.43% of DPPH radical inhibition for PFE method and from 76.01 to 89.94% in the case of USE method.

scholarly journals Application of Hplc-Pda Method Using Two Different Extraction Procedures for the Determination of Alkylresorcinols in Cereals

2015 ◽  
Vol 69 (4) ◽  
pp. 182-189
Author(s):  
Natālija Gailāne ◽  
Ida Jākobsone ◽  
Vadims Bartkevičs ◽  
Ylle Tamm
Keyword(s):  
High Performance ◽  
Soxhlet Extraction ◽  
Extraction Methods ◽  
Photodiode Array Detection ◽  
Intermediate Precision ◽  
Chromatography Method ◽  
Extraction Procedures ◽  
Phenolic Lipids ◽  
Validation Parameters

Abstract Cereals, especially barley, are an important source of vitamins, minerals, dietary fibre and various phytochemicals, such as alkylresorcinols (ARs). Cereal ARs are a group of phenolic lipids located in the outer parts of grain, particularly in rye and wheat, but not found in refined flour or in refined products from cereals. This study focuses on the comparison of different extraction procedures applied for the determination of the content of ARs (C15:0 - C23:0) in grain of Latvian barley genotypes. The content of ARs in 1 rye and 16 barley samples grown with different amounts of fertilier was determined by High Performance Liquid Chromatography method with Photodiode Array detection (HPLC-PDA) developed by us. Two different extraction methods were compared: accelerated Soxhlet extraction and 24-hour extraction. Aside from validation of the extraction procedures, validation parameters for the HPLC-PDA based quantitation method were provided. The coefficients of variation for repeatability and intermediate precision were < 9% and < 3%, respectively. The content of ARs determined with the HPLC-PDA method in conjunction with accelerated Soxhlet extraction was up to 1.5 times higher than using 24-hour extraction. AR content varied from 2.11 ± 0.04 to 3.80 ± 0.10 mg·100 g-1 for 24-hour extraction and from 2.66 ± 0.06 to 5.70 ± 0.20 mg·100 g-1 for accelerated Soxhlet extraction, indicating the increased efficiency of this procedure in analysis of ARs.

scholarly journals Current Methods for the Extraction and Analysis of Isothiocyanates and Indoles in Cruciferous Vegetables

Analytica ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 93-120
Author(s):  
Sofia Karanikolopoulou ◽  
Panagiota-Kyriaki Revelou ◽  
Marinos Xagoraris ◽  
Maroula G. Kokotou ◽  
Violetta Constantinou-Kokotou
Keyword(s):  
High Performance ◽  
Degradation Products ◽  
Analytical Techniques ◽  
Extraction Methods ◽  
Analytical Determination ◽  
Cruciferous Vegetables ◽  
Plant Metabolites ◽  
Secondary Plant Metabolites ◽  
Wide Range

Cruciferous vegetables are characterized by the presence of sulfur-containing secondary plant metabolites known as glucosinolates (GLS). The consumption of cruciferous vegetables such as broccoli, cabbage, rocket salad, and cauliflower has been related to the prevention of non-communicable diseases. Their beneficial effects are attributed to the enzymatic degradation products of GLS, e.g., isothiocyanates and indoles. Owing to these properties, there has been a shift in the last few years towards the research of these compounds and a wide range of methods for their extraction and analytical determination have been developed. The aim of this review is to present the sample preparation and extraction procedures of isothiocyanates and indoles from cruciferous vegetables and the analytical methods for their determination. The majority of the references that have been reviewed are from the last decade. Although efforts towards the application of eco-friendly non-conventional extraction methods have been made, the use of conventional solvent extraction is mainly applied. The major analytical techniques employed for the qualitative and quantitative analysis of isothiocyanates and indoles are high-performance liquid chromatography and gas chromatography coupled with or without mass spectrometry detection. Nevertheless, the analytical determination of isothiocyanates presents several problems due to their instability and the absence of chromophores, making the simultaneous determination of isothiocyanates and indoles a challenging task.

scholarly journals Efficient Mild Organosolv Lignin Extraction in a Flow-Through Setup Yielding Lignin with High β-O-4 Content

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 1913 ◽  
Author(s):  
Douwe S. Zijlstra ◽  
Coen A. Analbers ◽  
Joren de Korte ◽  
Erwin Wilbers ◽  
Peter J. Deuss
Keyword(s):  
Extraction Efficiency ◽  
Downstream Processing ◽  
Extraction Methods ◽  
Structural Quality ◽  
Aryl Ether ◽  
Organosolv Lignin ◽  
Lignin Extraction ◽  
Flow Through ◽  
Harsh Conditions ◽  
Water Ratio

Current lignin fractionation methods use harsh conditions that alter the native lignin structure, resulting in a recalcitrant material which is undesired for downstream processing. Milder fractionation processes allow for the isolation of lignins that are high in β-aryl ether (β-O-4) content, however, at reduced extraction efficiency. The development of improved lignin extraction methods using mild conditions is therefore desired. For this reason, a flow-through setup for mild ethanosolv extraction (120 °C) was developed. The influence of acid concentration, ethanol/water ratio, and the use of other linear alcohol co-solvents on the delignification efficiency and the β-O-4 content were evaluated. With walnut shells as model feedstock, extraction efficiencies of over 55% were achieved, yielding lignin with a good structural quality in terms of β-O-4 linking motifs (typically over 60 per 100 aromatic units). For example, lignin containing 66 β-O-4 linking motifs was obtained with an 80:20 n-propanol/water ratio, 0.18 M H2SO4 with overall a good extraction efficiency of 57% after 5 h. The majority of the lignin was extracted in the first 2 hours and this lignin showed the best structural quality. Compared to batch extractions, both higher lignin extraction efficiency and higher β-O-4 content were obtained using the flow setup.

scholarly journals Determination and Separation of Diarylheptanoids From Alder Growing in Latvia

2015 ◽  
Vol 1 ◽  
pp. 329 ◽  
Author(s):  
Liga Roze ◽  
Oskars Bikovens ◽  
Galina Telysheva
Keyword(s):  
High Performance Liquid Chromatography ◽  
Liquid Chromatography ◽  
Quantitative Determination ◽  
High Performance ◽  
Internal Standard ◽  
Extraction Methods ◽  
Internal Standard Method ◽  
Black Alder ◽  
Phenolic Components

The composition of diarylhepatnoids fraction isolated from bark of two alder species (grey alder and black alder) was studied. The efficiency of three extraction methods used for isolation of diarylhepatnoids from alder bark was compared. Two diarylhepatnoids: 1,7-bis-(3,4-dihydroxyphenyl)-heptan- 3-one-5-O-β-D-xylopyronoside (oregonin) and 1,7-bis-(3,4-dihydroxyphenyl)-3-hydroxyheptane-5-O-β-D- xylopyranoside were isolated from the bark of grey alder. The phenolic components of the extracts were analyzed by high-performance liquid chromatography (HPLC). Quantitative determination of oregonin was performed using an internal standard method. The results obtained show that alder barks are rich source of diarylhepatnoids.

Sign in / Sign up

Export Citation Format

Share Document