scholarly journals Prediction of Total Phenolic Content in Extracts of Prunella Species from HPLC Profiles by Multivariate Calibration

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Saliha Sahin ◽  
Esra Isik ◽  
Cevdet Demir
Keyword(s):  
High Performance ◽  
Multivariate Calibration ◽  
Principal Component Regression ◽  
Principal Component ◽  
Total Phenol ◽  
Total Phenolic ◽  
Total Phenol Content ◽  
Phenol Content ◽  
Calibration Methods ◽  
Hplc Profiles

The multivariate calibration methods—principal component regression (PCR) and partial least squares (PLSs)—were employed for the prediction of total phenol contents of four Prunella species. High performance liquid chromatography (HPLC) and spectrophotometric approaches were used to determine the total phenol content of the Prunella samples. Several preprocessing techniques such as smoothing, normalization, and column centering were employed to extract the chemically relevant information from the data after alignment with correlation optimized warping (COW). The importance of the preprocessing was investigated by calculating the root mean square error (RMSE) for the calibration set of the total phenol content of Prunella samples. The models developed based on the preprocessed data were able to predict the total phenol content with a precision comparable to that of the reference of the Folin-Ciocalteu method. PLS model seems preferable, because of its predictive and describing abilities and good interpretability of the contribution of compounds to the total phenol content. Multivariate calibration methods were constructed to model the total phenol content of the Prunella samples from the HPLC profiles and indicate peaks responsible for the total phenol content successfully.

scholarly journals Antioxidant activity and total phenolic content in Caulerpa filiformis (Chlorophyta) from Sechura Bay and Paracas Bay, Peru

2020 ◽  
Vol 27 (1) ◽  
pp. 061-066 ◽  
Author(s):  
Joyce Mamani ◽  
Jorge Chávez ◽  
Eder Apumayta ◽  
Patricia Gil-Kodaka
Keyword(s):  
Antioxidant Activity ◽  
Secondary Metabolites ◽  
Methanolic Extract ◽  
Total Phenol ◽  
North Coast ◽  
Total Phenolic ◽  
Total Phenol Content ◽  
Phytochemical Screening ◽  
Phenol Content ◽  
The North

In Peru, Caulerpa filiformis is a marine algae listed as an invasive species. For years, its distribution has been considered to be in the north coast (Isla Lobos de Afuera and Piura) until a recent report of its distribution in the central coast (Ancash, Lima, and Ica). The present investigation aims to determine the main groups of secondary metabolites, total phenol content, and antioxidant activity of the methanolic extract of C. filiformis from Sechura Bay (Piura) and Paracas Bay (Ica). The main chemical groups were determined through phytochemical screening, the content of phenols by the Folin–Ciocalteu method, and antioxidant activity by the ABTS method (2,2-azinobis-[3-ethylbenzothiazoline-6-sulfonic acid]) and 2,2′-diphenyl-1-picrylhydrazyl (DPPH). The phytochemical screening of the methanolic extract of C. filiformis from Sechura Bay and Paracas Bay revealed the presence of carbohydrates, polyphenols, tannins, flavonoids, lipids, alkaloids, steroids, and triterpenes for both extracts. The total phenol content of the extract of C. filiformis from Sechura Bay (39.31 ± 0.39 mg of AGE/g extract) was significantly higher (p < 0.05) than that from Paracas Bay (18.78 ± 0.31 mg of AGE/g extract). In the ABTS and DPPH assays, the antioxidant capacity of the Sechura C. filiformis extract (IC50 = 3.49 ± 0.01 and 2.18 ± 0.02 mg/mL) was significantly higher (p < 0.05) than that of the Paracas C. filiformis extract (IC50 = 6.41 ± 0.02 and 2.42 ± 0.04 mg /mL). These findings suggest that the methanolic extract of C. filiformis is a source of secondary metabolites with an antioxidant potential.

scholarly journals Antioxidant activity and total phenol content of blackberries cultivated in a highland tropical climate

2017 ◽  
Vol 39 (1) ◽  
pp. 43 ◽  
Author(s):  
Mayara Neves Santos Guedes ◽  
Rafael Pio ◽  
Luana Aparecida Castilho Maro ◽  
Fabíola Fonseca Lage ◽  
Celeste Maria Patto de Abreu ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Free Radical ◽  
Phenolic Compounds ◽  
High Performance ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Total Phenol ◽  
Total Phenol Content ◽  
Phenol Content ◽  
Phenolic Contents

Blackberries are an important option for the diversification of fruit crops. However, there is currently no literature regarding plant cultivation in high-altitude tropical climates. Knowledge of the phenolic composition of blackberries is essential because variations in the levels of these components may exist between cultivars and may depend on environmental conditions. High performance liquid chromatography (HPLC) was used to evaluate the total phenol content of different blackberry cultivars (Arapaho, Brazos, Cainguangue, Cherokee, Choctaw, Comanche, Ébano, Guarani, Tupy and Xavante). Free radical scavenging activity in these cultivars was assayed using a DPPH test. The HPLC-UV chromatogram of blackberry fruit extracts at 280 nm revealed the presence of phenolic compounds. The results showed significant differences in the levels of phenolic compounds in the blackberry cultivars tested. Antioxidant activity was evaluated using the ABTS free radical and ranged from 2.7 ± 0.1 to 19 ± 2 μmole of Trolox equivalents per gram of sample (b.u.). These results are in good correlation with the phenolic contents of the blackberries tested. The Xavante blackberry cultivar had the highest levels of polyphenols that could be individually identified. Catechin polyphenols were found to be the main component in the blackberry varieties tested. 

Antioxidant Capacity and Polyphenolic Content of Eucommia Ulmoides Oliv Leaf Extract

2011 ◽  
Vol 396-398 ◽  
pp. 1349-1352
Author(s):  
Jian Hui Wang ◽  
Dong Min Liu ◽  
Yong Le Liu ◽  
Chi Ling Li ◽  
Yuan Yuan Cheng ◽  
...  
Keyword(s):  
Vegetable Oils ◽  
Antioxidant Activities ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Total Phenol ◽  
Total Phenolic ◽  
Total Phenol Content ◽  
Scavenging Activity ◽  
Phenol Content ◽  
Dpph Method

This study was designed to determine the polyphenolic contents of Eucommia ulmoicles Oliv leaf extracts and evaluate their antioxidant activities in vitro. All the extracts were evaluated for their radical scavenging activity by the DPPH method and their oxidative-retarding efficiency in vegetable oils. It was observed that the highest values were found in 70% MeOH extracts for total phenolic content as gallic acid. A good correlation between antioxidant activity and total phenol content in the extracts was found. The extraction yield, total phenol content and radical scavenging activity were increased and peroxide formation in vegetable oils were decreased with the graded solvent concentration of MeOH. The phenolic compound yield ranged from 2.45 to 11.35% and the total phenol content increased from 34.51 mg/g to 47.68 mg/g. DPPH scavenging activity increased from 56.32% to 90.37% as MeOH concentration increased. Compared to the control (70.45 meq/kg), 70% MeOH fraction with 47.68 mg/g phenolic compounds shows much stronger antioxidant ability (30.12 meq/kg) in vegetable oil system.

scholarly journals ANALISIS KORELASI ANTARA KANDUNGAN FENOL TOTAL DENGAN AKTIVITAS ANTIBAKTERI EKSTRAK DAN FRAKSI Abelmoschus manihot L. TERHADAP Escherichia coli

PHARMACON ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 472
Author(s):  
Bella Kambey ◽  
Sri Sudewi ◽  
Imam Jayanto
Keyword(s):  
Escherichia Coli ◽  
Antibacterial Activity ◽  
Minimum Bactericidal Concentration ◽  
Pearson Correlation ◽  
Nutrient Broth ◽  
Total Phenol ◽  
Total Phenolic ◽  
Dilution Method ◽  
Total Phenol Content ◽  
Phenol Content

ABSTRACT This study aims to determine the total phenol content and Minimum Bactericidal Concentration (MBC) and the correlation of antibacterial activity with the total phonel content of the extract and the fraction of Abemoschus manihot L. against Escherichia coli. Gallic acid was used as a comparison standard in measuring the total phenol content using a UV-Vis spectrophotometer. The total phenolic conten of gedi leaf extract and fraction from Southeast Minahasa were ethanol extract 230.23 ± 0.008 µg GAE / g, n-hexane fraction 238.37 ± 0,024 µg GAE / g, ethyl acetade fraction 269.77 ± 0.016 µg GAE / g, and ethanol fraction 221.51 µg GAE / g. The extracts and fractions were tested for antibacterial activity against E. coli  by dilution method using Nutrient Broth (NB) media at concentrations of 1000 µg / mL,500 µg / mL, and 250 µg / mL. MBC test data (Minimum Bactericidal Concentration) were analyzed using Kolmogrov-smirnov, then continued with pearson correlation test. The result of the normality test showed that the extract and the A.manihot fraction had significantly distributed normal vlue (p> 0.05). Analysis Correlation of Pearson of extracts and fraction of A. manihot with antibacterial activity against E.coli showed significant result (p <0.05). 71% of antibacterial activity is influenced by total phenolic and the rest is contribution of other compounds that have the potential as antibacterial. Keywords: Phenol Total, Correlation, Escherichia coli, Green Gedi ABSTRAK Penelitian ini bertujuan untuk mengetahui kandungan fenol total dan Kadar Bunuh Minimum (KBM) serta korelasi aktivitas antibakteri dengan kandungan fenol total ekstrak dan fraksi Abelmoschus manihot L. terhadap Escherichia coli. Asam galat digunakan sebagai standar pembanding dalam mengukur kandungan fenol total menggunakan Spektrofotometer UV-Vis. Kandungan total fenolik pada ekstrak dan fraksi daun gedi hijau dari Minahasa Tenggara yaitu ekstrak etanol sebesar 230,23 ± 0,008 µg GAE/g, fraksi n-heksan 238,37 ± 0,024 µg GAE/g, fraksi etil asetat 269,77 ± 0,016 µg GAE/g, dan fraksi etanol 221,51 µg GAE/g. Ekstrak dan fraksi diuji aktivitas antibakteri terhadap E.coli dengan metode dilusi menggunakan media Nutrient Broth (NB) pada konsentrasi 1000 µg/mL, 500 µg/mL, dan 250 µg/mL. Data uji KBM (Konsentrasi Bunuh Minimum) dianalisis menggunakan Kolmogrov-smirnov, kemudian dilanjutkan dengan uji korelasi pearson. Hasil uji normalitas menunjukkan bahwa ekstrak dan fraksi A.manihot memiliki nilai signifikan terdistribusi normal (p > 0,05). Analisis korelasi pearson ekstrak dan fraksi A.manihot dengan aktivitas antibakteri terhadap E.coli  menunjukkan hasil signifikan (p <0,05). 71% aktivitas antibakteri dipengaruhi oleh fenolik total dan sisanya merupakan kontribusi senyawa lain yang berpotensi sebagai antibakteri. Kata kunci : Fenol Total, Korelasi, Escherichia coli, Gedi Hijau

scholarly journals Multivariate Validated Models for Simultaneous Determination of Ibuprofen and Famotidine in the Presence of Related Substances

2018 ◽  
Vol 101 (4) ◽  
pp. 1001-1007
Author(s):  
Eman S Elzanfaly ◽  
Hala E Zaazaa ◽  
Aya T Soudi ◽  
Maissa Y Salem
Keyword(s):  
Simultaneous Determination ◽  
Multivariate Calibration ◽  
Degradation Products ◽  
Principal Component Regression ◽  
Principal Component ◽  
Standard Addition ◽  
Spectrophotometric Methods ◽  
Related Substances ◽  
Calibration Methods

Abstract Two multivariate validated spectrophotometric methods, namely partial least-squares (PLS) and principal component regression (PCR), were developed and validated for the determination of ibuprofen and famotidine in presence of famotidine degradation products and ibuprofen impurity (4-isobutylacetophenone). A calibration set was prepared in which the two drugs together with the degradation products and impurity were modeled using a multilevel multifactor design. This calibration set was used to build the PLS and PCR models. The proposed models successfully predicted the concentrations of both drugs in validation samples, with low root mean square error of cross validation (RMSECV) percentage. The method was validated by the estimate of the figures of merit depending on the net analyte signal. The results of the two models showed that the simultaneous determination of both drugs could be performed in the concentration ranges of 100–500 µg/mL for ibuprofen and 5–25 µg/mL for famotidine. The proposed multivariate calibration methods were applied for the determination of ibuprofen and famotidine in their pharmaceutical formulation, and the results were verified by the standard addition technique.

Chemometrics-assisted spectrophotometric method for simultaneous estimation of antipsychotic drugs in biological fluid

2020 ◽  
Vol 16 ◽  
Author(s):  
Mojdeh Alibakhshi ◽  
Mahmoud Reza Sohrabi ◽  
Mehran Davallo
Keyword(s):  
Simultaneous Determination ◽  
Antipsychotic Drugs ◽  
Multivariate Calibration ◽  
Biological Fluid ◽  
Principal Component Regression ◽  
Reference Method ◽  
Principal Component ◽  
Simultaneous Estimation ◽  
Calibration Methods

Background: Haloperidol (HP) and Risperidone (RIS) are antipsychotic drugs and the simultaneous determination of these drugs is important. Estimation of HP and RIS alone or in combination with other drugs has been performed in a variety of ways. Objective: The aim of this paper was to propose a rapid, simple, accurate, and robust method for the simultaneous determination of HP and RIS using artificial neural networks (ANNs), partial least squares (PLS), and principal component regression (PCR) methods along with spectrophotometry technique. Methods: The simultaneous spectrophotometric determination of HP and RIS in synthetic mixtures and biological fluid was performed by applying ANNs containing feed forward backpropagation (FFBP) and radial basis function (RBF) networks as intelligent methods, as well as PLS, and principal component regression PCR as multivariate calibration methods. The Levenberg–Marquardt (LM), Scaled conjugate gradient (SCG), and Resilient Back-propagation (RP) algorithms with different layers and neurons were used in FFBP network and obtained results were compared with each other. Results: Among various algorithms of the FFBP network, the LM algorithm was selected as the best model with a lower mean square error (MSE). MSE of the RBF model was 1.46×10-25 and 1.62×10-23 for HP and RIS, respectively. On the other hand, the mean recovery of PLS and PCR was 99.91%, 100.01% and 98.60%, 101.90% for HP and RIS, respectively. Conclusion: The proposed models and high-performance liquid chromatography (HPLC) as a reference method were compared with each other by one-way analysis of variance (ANOVA) test at the 95 % confidence level for the urine sample. It was observed that the developed methods presented comparable results for the simultaneous determination of HP and RIS.

Research on Food Manufacturing with Effect and Comparison of Microwave and Traditional Cooking Processing on Antioxidant Function of Lotus Root

2014 ◽  
Vol 1056 ◽  
pp. 92-97
Author(s):  
Yun Long Zhu ◽  
Ting Chen ◽  
Jing Jing Zhu ◽  
Yang Yuan
Keyword(s):  
Microwave Power ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Total Phenol ◽  
Water Volume ◽  
Total Phenolic ◽  
Total Phenol Content ◽  
Phenol Content ◽  
Cooking Method ◽  
Lotus Root

Purpose: In view of the lotus root has significant antioxidant properties but if improperly cooked easily destroyed, compared with traditional cooking method, and discusses the applicability of microwave processing and establish the optimum processing conditions. Method: By setting different microwave power and heating time, handling fresh-cut lotus root vacuum packaging products with microwave, measured flavonoids, total phenolic content and DPPH clearance, and synchronization researched the traditional cook methods cooking, steaming and stir-frying, comprehensive comparison the antioxidant effect of all kinds of processed products. Results: ①Under following conditions microwave power ≥60 P, processing time≤6min, flavonoids and total phenol content were high, DPPH clearance was bigger also. ②Cooking 6min,water volume between 500-1000mL, flavonoids and total phenol contents was high, but change with the further increased water volume, the contents decrease, DPPH clearance was relatively stable, when confirmed water volume 1500mL, cooking 2-4min, flavonoids content slightly ascending, then changed into degressive changes, the change of DPPH clearance was similar. Total phenol content was decrease progressively along with extending of the cooking time. ③Handing under steaming 15min, three index of the products were high voltage products > atmospheric products, the latter's steamed time should be less than 20 min. ④Making products in oil capacity 25mL or less 3 min, with the increase of oil capacity, flavonoids, total phenolic content and DPPH clearance were progressive increase. ⑤Lotus root food antioxidant activity: steamed food < cooked food < microwave food < fried food. Conclusion: In protecting lotus root antioxidant health care function in different cropping system, microwave is a kind of superior to boiling, steaming, and pressure cooking method and second only to oil fry.

Comparison of Multivariate Calibration and Discriminant Analysis in Evaluating NIR Spectroscopy for Determination of Meat Tenderness

1997 ◽  
Vol 51 (3) ◽  
pp. 350-357 ◽  
Author(s):  
Tormod Næs ◽  
Kjell Ivar Hildrum
Keyword(s):  
Discriminant Analysis ◽  
Reference Values ◽  
Near Infrared ◽  
Multivariate Calibration ◽  
Principal Component Regression ◽  
Nir Spectroscopy ◽  
Principal Component ◽  
Meat Tenderness ◽  
Intermediate Group ◽  
Calibration Methods

Often the primary goal of analytical measurement tasks is not to find good estimates of continuous reference values but rather to determine whether a sample belongs to one of a number of categories or subgroups. In this paper the potential of different statistical techniques in the classification of raw beef samples in tenderness subgroups was studied. The reference values were based on sensory analysis of beef tenderness of 90 samples from bovine M. longissimus dorsi muscles. The sample set was divided into three categories—very tough, intermediate, and very tender—according to degree of tenderness. A training set of samples was used to find the relationship between category and near-infrared (NIR) spectroscopic measurements. The study indicates that classical discriminant analysis has advantages in comparison to multivariate calibration methods [i.e., principal component regression (PCR)], in this application. One reason for this observation seems to be that PCR underestimates high measurement values and overestimates low values. In this way most samples are assigned to the intermediate group of samples, causing a small number of erroneous classifications for the intermediate subgroup, but a large number of errors for the two extreme groups. With the use of PCR the number of correct classifications in the extreme subgroups was as low as 23%, while the use of discriminate analysis increased this number to almost 60%. The number of classifications in correct or neighbor subgroup for the two extreme subgroups was equal to 97%. A “bias-correction” was also attempted for PCR, and this gave results comparable to the best results obtained by discriminant analysis methods. Test sets used NIR analysis of fresh, raw beef samples with different processing. While this spectroscopic approach had previously been shown to be useful with frozen products, it appears unsuitable at this time for fresh beef. However, its marginal analytical utility proved useful in evaluating the two classification approaches employed in this study.

scholarly journals Comparative Analysis of the Nutritional Components and Antioxidant Activities of Different Brassica juncea Cultivars

Foods ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 840
Author(s):  
Hee-Yeon Kwon ◽  
Sun-Il Choi ◽  
Hye-In Park ◽  
Seung-Hyun Choi ◽  
Wan-Sup Sim ◽  
...  
Keyword(s):  
Brassica Juncea ◽  
High Performance ◽  
Antioxidant Activities ◽  
Radical Scavenging ◽  
Total Phenol ◽  
Total Phenol Content ◽  
Phenol Content ◽  
Crude Lipid ◽  
Antioxidant Power ◽  
Nutritional Components

The purpose of this study was to compare the nutritional components and antioxidant activities of two different cultivars of Brassica juncea (Dolsan, Yeosu, Korea (BJD) and (Jeongseon, Gangwon, Korea (BJJ)). We investigated the proximate composition (moisture, crude ash, crude protein and crude lipid), antioxidant activities (2,2-Diphenyl-2-picrylhydrazil (DPPH) scavenging activity and ferric reducing antioxidant power (FRAP)), total phenol content, total flavonoid content and sinigrin content by high-performance liquid chromatography analysis. Our results show that the proximate compositions of BJD and BJJ were not significantly different. However, both the DPPH radical scavenging and FRAP activities of the BJJ extracts were higher than those of the BJD extracts. The total phenol contents of the BJD and BJJ extracts were 6.56 and 9.80 mg gallic acid equivalent/g, respectively. The total flavonoids content of the BJD and BJJ extracts were 20.92 and 34.81 mg rutin equivalent/g, respectively, whereas the sinigrin contents, one of the major compounds in BJD and BJJ extracts, were 16.16 mg/g and 11.73 mg/g, respectively. In this study, we confirmed that, by comparing BJJ and BJD, the sinigrin content of BJD was higher than that of BJJ, but the antioxidant activity and phenol content of BJD were superior to that of BJJ.

scholarly journals ANALISIS TOTAL FENOLIK DAUN GEDI HIJAU (Abelmoschus manihot L.) DENGAN MENGGUNAKAN SPEKTROSKOPI FTIR DAN KEMOMETRIK

PHARMACON ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 758
Author(s):  
Jhon D. Rumoroy ◽  
Sri Sudewi ◽  
Jainer P. Siampa
Keyword(s):  
Standard Error ◽  
Phenolic Content ◽  
Total Phenol ◽  
Total Phenolic ◽  
Total Phenol Content ◽  
Phenol Content ◽  
Leaf Extracts ◽  
Natural Substances ◽  
Measurement Results ◽  
Error Calibration

ABSTRACTNatural phenolic compounds, including organic compounds, is the natural substances that produced by organisms. This study aims to determine the total phenol content and optimization using the FTIR method for rapid phenols analysis. Gallic acid was used as a comparison standard to measure the total phenol content using a UV-Vis spectrophotometer. The calorimetric method was used to determine the total Phenolic content of the Green Gedi Leaf extracts in 8 samples of growing sites, namely Minahasa 855.8 µg GEA / g extract ± 0.033, Southeast Minahasa 283.7 µg GEA / g extract ± 0.006, Manado 580.2 µg GEA / g extract ± 0.012, North Minahasa 716.2 µg GEA / g extract ± 0.091, Kotamobagu 793 µg GEA / g extract ± 0.03, Minahasa Selatan 290.6 µg GEA / g extract ± 0.027, Bitung 365.6 µg GEA / g extract ± 0.035, Tomohon as much as 546.5 µg GEA / g extract ± 0.003. This result involves a combination of variables x (FTIR measurement results) and y variables (data from the analysis of Folin-Ciocalteu). Error value (standard error calibration (SEC = 0.003), standard error of prediction (SEP = 0.042)) and calibration r value 0.999 and r validation 0.98. Keywords: Green Gedi Leaves, UV-Vis Spectrophotometer, Kemometrics, Phenol Total, FTIR Spectrophotometry.ABSTRAK Senyawa fenolik alam termasuk senyawa organik bahan alam yang dihasilkan oleh organisme. Penelitian ini bertujuan untuk mengetahui kandungan fenol total Daun Gedi Hijau dan optimasi menggunakan metode FTIR untuk analisis fenolsecara cepat. Asam  galat digunakan standar pembanding dalam mengukur kandungan total fenol menggunakan spektrofotometer UV-Vis. Metode kemometrik digunakan untuk mengetahui kandungan Total Fenolik pada ekstrak Daun Gedi Hijau pada 8 sampel tempat tumbuh yaitu Minahasa 855,8 µg GEA/g  ekstrak ± 0,033, Minahasa Tenggara 283,7 µg GEA/g  ektrak ± 0,006, Manado 580,2 µg GEA/g  ekstrak ± 0,012, Minahasa Utara 716,2 µg GEA/g  ekstrak ± 0,091, Kotamobagu 793 µg GEA/g  ekstrak ± 0,03, Minahasa Selatan 290,6 µg GEA/g  ekstrak ± 0,027, Bitung 365,6 µg GEA/g  ekstrak ± 0.035, Tomohon sebesar 546,5 µg GEA/g  ekstrak ± 0,003. Hasil ini melibatkan kombinasi variable x (hasil pengukuran FTIR) dan variable y (data hasil analisis Folin-Ciocalteu). Nilai kesalahan (standard error calibration (SEC = 0.003), standard error of prediction (SEP = 0.042)) dan nilai r kalibrasi 0,999 serta  r validasi 0,98. Kata Kunci: Daun Gedi Hijau, Spektrofotometer UV-Vis, Kemometrik, Total Fenol, Spektrofotometri FTIR.

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