1
|
Li G, Zhao Y, Qin Z, Wei S, Liang D, Liang Y, Song W, Ding B. Mechanistic Understanding of Tyrosinase Inhibition by Polymeric Proanthocyanidins from Acacia confusa Stem Bark and Their Effect on the Browning Resistance of Fresh-Cut Asparagus Lettuce. Molecules 2023; 28:3435. [PMID: 37110667 PMCID: PMC10143530 DOI: 10.3390/molecules28083435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2023] [Revised: 04/05/2023] [Accepted: 04/11/2023] [Indexed: 04/29/2023] Open
Abstract
Tyrosinase inhibitors are capable of preventing unfavorable enzymatic browning of fruits and vegetables. In this study, the capacity of Acacia confusa stem bark proanthocyanidins (ASBPs) to inhibit tyrosinase activity was evaluated. ASBPs were shown to be a high-potential inhibitor of tyrosinase with IC50 values of 92.49 ± 4.70 and 61.74 ± 8.93 μg/mL when using L-tyrosine and L-DOPA as the substrate, respectively. The structural elucidation performed with UV-vis, FT-IR spectroscopy, ESI-MS and thiolysis coupled to HPLC-ESI-MS suggested that ASBPs had structural heterogeneity in monomer units and interflavan linkages and consisted mainly of procyanidins dominant with B-type linkages. To gain insights into the inhibitory mechanisms of ASBPs against tyrosinase, different spectroscopic and molecular docking methods were further conducted. Results validated that ASBPs possessed the ability to chelate copper ions and could prevent the oxidation process of substrates by tyrosinase. The hydrogen bond formed with Lys-376 residue played a key role in the binding force of ASBPs with tyrosinase that induced a certain alteration in the microenvironment and secondary structure of tyrosinase, resulting in the enzymatic activity being ultimately restricted. It was also observed that ASBPs treatment effectively inhibited the activities of PPO and POD to retard the surface browning of fresh-cut asparagus lettuce and thus extended their shelf-life. The results provided preliminary evidence supporting the exploitation of ASBPs into potential antibrowning agents for the fresh-cut food industry.
Collapse
Affiliation(s)
- Guanghui Li
- College of Life Science, Yangtze University, Jingzhou 434025, China
| | - Yaying Zhao
- College of Life Science, Yangtze University, Jingzhou 434025, China
- College of Life Science and Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
| | - Zeya Qin
- College of Life Science, Yangtze University, Jingzhou 434025, China
| | - Shudong Wei
- College of Life Science, Yangtze University, Jingzhou 434025, China
- Henan Key Laboratory of Water Pollution Control and Rehabilitation Technology, Henan University of Urban Construction, Pingdingshan 467036, China
| | - Dandan Liang
- College of Life Science, Yangtze University, Jingzhou 434025, China
| | - Yun Liang
- College of Life Science, Yangtze University, Jingzhou 434025, China
- College of Life Science and Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
| | - Wei Song
- College of Life Science and Engineering, Henan University of Urban Construction, Pingdingshan 467036, China
| | - Baomiao Ding
- College of Life Science, Yangtze University, Jingzhou 434025, China
| |
Collapse
|
2
|
Antioxidant and antityrosinase activity of extractable condensed tannins from durian shells with antibrowning effect in fresh-cut asparagus lettuce model. Lebensm Wiss Technol 2022. [DOI: 10.1016/j.lwt.2022.113423] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
3
|
Elmi A, Spina R, Risler A, Philippot S, Mérito A, Duval RE, Abdoul-latif FM, Laurain-Mattar D. Evaluation of Antioxidant and Antibacterial Activities, Cytotoxicity of Acacia seyal Del Bark Extracts and Isolated Compounds. Molecules 2020; 25:E2392. [PMID: 32455580 PMCID: PMC7288156 DOI: 10.3390/molecules25102392] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 05/11/2020] [Accepted: 05/13/2020] [Indexed: 11/17/2022] Open
Abstract
Water extract of Acacia seyal bark is used traditionally by the population in Djibouti for its anti-infectious activity. The evaluation of in vitro antibacterial, antioxidant activities and cytotoxicity as well as chemical characterization of Acacia seyal bark water and methanolic extracts were presented. The water extract has a toxicity against the MRC-5 cells at 256 μg/mL while the methanolic extract has a weak toxicity at the same concentration. The methanolic extract has a strong antioxidant activity with half maximal inhibitory concentration (IC50) of 150 ± 2.2 μg/mL using 1-diphenyl-2-picrylhydrazyl (DPPH) and IC50 of 27 ± 1.3 μg/mL using 2,2'-azino-bis 3-ethylbenzthiazoline-6-sulphonic acid (ABTS) radical methods. For ferric reducing/antioxidant power (FRAP) assay, the result is 45.74 ± 5.96 μg Vitamin C Equivalent (VCE)/g of dry weight (DW). The precipitation of tannins from methanol crude extract decreases the MIC from 64 µg/mL to 32 µg/mL against Staphylococcus aureus and Corynebacterium urealyticum. However, the antioxidant activity is higher before tannins precipitation than after (IC50 = 150 µg/mL for methanolic crude extract and 250 µg/mL after tannins precipitation determined by DPPH method). By matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) analysis, the results showed that the condensed tannins consist of two types of catechin and gallocatechin-based oligomers. The fractionation led to the identification of three pure compounds: two flavanols catechin and epicatechin; one triterpene as lupeol; and a mixture of three steroids and one fatty acid: campesterol, stigmasterol, clionasterol, and oleamide.
Collapse
Affiliation(s)
- Abdirahman Elmi
- Université de Lorraine, CNRS, L2CM, F-54000 Nancy, France; (A.E.); (R.S.); (A.R.); (S.P.); (R.E.D.)
- Medicinal Research Institute, Centre d’Etudes et de Recherche de Djibouti, IRM-CERD, Route de l’Aéroport, Haramous B.P. 486, Djibouti; (A.M.); (F.M.A.-l.)
| | - Rosella Spina
- Université de Lorraine, CNRS, L2CM, F-54000 Nancy, France; (A.E.); (R.S.); (A.R.); (S.P.); (R.E.D.)
| | - Arnaud Risler
- Université de Lorraine, CNRS, L2CM, F-54000 Nancy, France; (A.E.); (R.S.); (A.R.); (S.P.); (R.E.D.)
| | - Stéphanie Philippot
- Université de Lorraine, CNRS, L2CM, F-54000 Nancy, France; (A.E.); (R.S.); (A.R.); (S.P.); (R.E.D.)
| | - Ali Mérito
- Medicinal Research Institute, Centre d’Etudes et de Recherche de Djibouti, IRM-CERD, Route de l’Aéroport, Haramous B.P. 486, Djibouti; (A.M.); (F.M.A.-l.)
| | - Raphaël E. Duval
- Université de Lorraine, CNRS, L2CM, F-54000 Nancy, France; (A.E.); (R.S.); (A.R.); (S.P.); (R.E.D.)
- ABC Platform, Faculté de Pharmacie, F-54505 Vandoeuvre-lès-Nancy, France
| | - Fatouma Mohamed Abdoul-latif
- Medicinal Research Institute, Centre d’Etudes et de Recherche de Djibouti, IRM-CERD, Route de l’Aéroport, Haramous B.P. 486, Djibouti; (A.M.); (F.M.A.-l.)
| | - Dominique Laurain-Mattar
- Université de Lorraine, CNRS, L2CM, F-54000 Nancy, France; (A.E.); (R.S.); (A.R.); (S.P.); (R.E.D.)
| |
Collapse
|
4
|
Insoluble-Bound Polyphenols Released from Guarana Powder: Inhibition of Alpha-Glucosidase and Proanthocyanidin Profile. Molecules 2020; 25:molecules25030679. [PMID: 32033416 PMCID: PMC7036825 DOI: 10.3390/molecules25030679] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 02/01/2020] [Accepted: 02/04/2020] [Indexed: 01/24/2023] Open
Abstract
The Brazilian Food Supplement Law recently recognized that guarana (Paullinia cupana) contains bioactive substances, hence supporting its role as a functional food ingredient. The health benefits of guarana are associated, at least in part, to its phenolic compounds. However, to the best of our knowledge, there is no literature addressing the presence of phenolic compounds in the fraction containing insoluble-bound compounds and its contribution in terms of alpha-glucosidase inhibition. The concentration of phenolic extracts released from the insoluble-bound fraction required to inhibit 50% of alpha-glucosidase (IC50) activity was 5.8-fold lower than that present in the soluble counterpart. Both fractions exhibited a mixed inhibition mode. Fourteen proanthocyanidins (dimers to tetramers) present in the insoluble-bound fraction were tentatively identified by MALDi-TOF-MS. Future studies aiming at increasing the concentration of the soluble counterpart are deemed necessary. The results presented here enhance the phenolic database of guarana and have a practical impact on the procurement of nutraceuticals and functional ingredients related to the prevention and/or management of type 2 diabetes. The Brazilian normative on food supplements has been recently revised. This study lends support to the future inclusion of guarana powder in the list of sources of proanthocyanidins for the industry of food supplements.
Collapse
|
5
|
Gong CF, Wang YX, Wang ML, Su WC, Wang Q, Chen QX, Shi Y. Evaluation of the Structure and Biological Activities of Condensed Tannins from Acanthus ilicifolius Linn and Their Effect on Fresh-Cut Fuji Apples. Appl Biochem Biotechnol 2019; 189:855-870. [PMID: 31131419 DOI: 10.1007/s12010-019-03038-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2019] [Accepted: 05/10/2019] [Indexed: 10/26/2022]
Abstract
Condensed tannins (CTS) have been isolated and purified from leaves of Acanthus ilicifolius Linn. And their structures were investigated by three methods: 13C nuclear magnetic resonance (13C NMR), reversed-phase high-performance liquid chromatography (RP-HPLC), and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS). The results showed that the CTS were a mixture of catechin/epicatechin, galatechin/epicatechin, and amphicin/epigalin, and that the polymer chain lengths were 3-mers to 14-mers. Antityrosinase activities and antioxidant activities of the CTS from A. ilicifolius leaves were further studied. The IC50 of the CTS on mushroom tyrosinase activity was determined to be 19.7 ± 0.13 μg/mL, and inhibition type analyses indicated that the CTS were mixed type inhibitors and their inhibition CTS was reversible. The CTS from A. ilicifolius leaves also exhibited potential antioxidant activity. The IC50 of DPPH and ABTS scavenging activities were 104 ± 0.894 μg/mL and 86 ± 0.616 μg/mL, respectively. And the FRAP value was 758.28 ± 2.42 mg AAE/g. In addition, we found that the CTS from A. ilicifolius leaves had an excellent effect on preserving the quality of fresh-cut apples by preventing apples from browning through reducing polyphenol oxidase activities in apples.
Collapse
Affiliation(s)
- Chen-Fang Gong
- School of Life Sciences, Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, 361002, China
| | - Yu-Xia Wang
- School of Life Sciences, Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, 361002, China
| | - Meng-Li Wang
- School of Life Sciences, Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, 361002, China
| | - Wei-Chao Su
- School of Life Sciences, Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, 361002, China
| | - Qin Wang
- School of Life Sciences, Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, 361002, China
| | - Qing-Xi Chen
- School of Life Sciences, Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, 361002, China
| | - Yan Shi
- School of Life Sciences, Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, 361002, China.
| |
Collapse
|
6
|
Chen H, Sun K, Yang Z, Guo X, Wei S. Identification of Antioxidant and Anti-α-amylase Components in Lotus (Nelumbo nucifera, Gaertn.) Seed Epicarp. Appl Biochem Biotechnol 2018; 187:677-690. [PMID: 30039473 DOI: 10.1007/s12010-018-2844-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Accepted: 07/16/2018] [Indexed: 01/30/2023]
Abstract
Lotus seed epicarp, a byproduct of lotus seed production process, is usually discarded as a waste. In this study, antioxidant and anti-α-amylase activities of freeze-dried water and various methanol extracts of lotus seed epicarp were evaluated. The extract obtained by 80% methanol exhibited the strongest DPPH and ABTS radical scavenging activity and ferric reducing power, as well as the greatest inhibitory potential on α-amylase. The excellent antioxidant and α-amylase inhibitory activities of 80% methanol extract might be attributed to its highest concentrations of total phenolics, flavonoids, and condensed tannins. The inhibition kinetic analysis revealed that the 80% methanol extract was a reversible and uncompetitive-type inhibitor of α-amylase. Furthermore, based on MALDI-TOF-MS and thiolysis-HPLC-ESI-MS, the main active components present in 80% methanol extract were identified to be B-type heteropolymeric condensed tannins built up of mixtures of propelargonidins, procyanidins, and prodelphinidins, with the predominance of procyanidins and epicatechin as the main constitutive units. The results obtained suggested that lotus seed epicarp could be exploited as a potential source of natural antioxidants and α-amylase inhibitors.
Collapse
Affiliation(s)
- Hui Chen
- Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, Yangtze University, Jingzhou, 434025, China.,Research Center of Milu Health and Habitat, Yangtze University, Jingzhou, 434025, China
| | - Kunkun Sun
- Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, Yangtze University, Jingzhou, 434025, China
| | - Zenan Yang
- Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, Yangtze University, Jingzhou, 434025, China
| | - Xinghui Guo
- Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, Yangtze University, Jingzhou, 434025, China
| | - Shudong Wei
- Engineering Research Center of Ecology and Agricultural Use of Wetland, Ministry of Education, Yangtze University, Jingzhou, 434025, China. .,Hubei Research and Inspection Sharing Platform for Freshwater Product Quality and Safety, Yangtze University, Jingzhou, 434025, China.
| |
Collapse
|
7
|
Lin HY, Chang TC, Chang ST. A review of antioxidant and pharmacological properties of phenolic compounds in Acacia confusa. J Tradit Complement Med 2018; 8:443-450. [PMID: 30302324 PMCID: PMC6174263 DOI: 10.1016/j.jtcme.2018.05.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Revised: 05/01/2018] [Accepted: 05/05/2018] [Indexed: 02/08/2023] Open
Abstract
In the present review article, the phytochemical, antioxidant and pharmacological studies are congregated and summarized concerning the current knowledge of the phenolic compounds of a traditional medical plant Acacia confusa in Taiwan. This plant is native to Taiwan and South-East Asia. It possesses major pharmacological activities, including antioxidant and radical scavenging activity, hepatoprotective effect, xanthine oxidase inhibition, semicarbazide-sensitive amine oxidase inhibition, angiotensin I converting enzyme inhibition, antihyperuricemic effect and anti-inflammatory activity. Phenolic compounds, especially flavonoids, flavonol glycoside and phenolic acid derivatives, are the main phytochemical compounds isolated from different plant parts of A. confusa. Recent interest in this species has focused on pharmacological investigations of the phytochemicals which exhibit potent antioxidant activity based on the multiple phenolic functionalities. The consequence of this review will further extend the potential applications of this plant and offer persuasive support to its future use in the fields of clinical medicine and health functional food.
Collapse
Affiliation(s)
- Huan-You Lin
- School of Forest and Resource Conservation, National Taiwan University, Taiwan, ROC
| | - Tzu-Cheng Chang
- School of Forest and Resource Conservation, National Taiwan University, Taiwan, ROC
| | - Shang-Tzen Chang
- School of Forest and Resource Conservation, National Taiwan University, Taiwan, ROC
| |
Collapse
|
8
|
Thermal degradation, dynamic mechanical and morphological properties of PVC stabilized with natural polyphenol-based epoxy resin. Polym Bull (Berl) 2017. [DOI: 10.1007/s00289-017-2220-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
9
|
Navarro-Hoyos M, Lebrón-Aguilar R, Quintanilla-López JE, Cueva C, Hevia D, Quesada S, Azofeifa G, Moreno-Arribas MV, Monagas M, Bartolomé B. Proanthocyanidin Characterization and Bioactivity of Extracts from Different Parts of Uncaria tomentosa L. (Cat's Claw). Antioxidants (Basel) 2017; 6:E12. [PMID: 28165396 PMCID: PMC5384175 DOI: 10.3390/antiox6010012] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2016] [Revised: 01/11/2017] [Accepted: 01/26/2017] [Indexed: 11/17/2022] Open
Abstract
Apart from alkaloids, bioactive properties of Uncaria tomentosa L. have been attributed to its phenolic constituents. Although there are some reports concerning low-molecular-weight polyphenols in U. tomentosa, its polymeric phenolic composition has been scarcely studied. In this study, phenolic-rich extracts from leaves, stems, bark and wood (n = 14) of Uncaria tomentosa plants from several regions of Costa Rica were obtained and analysed in respect to their proanthocyanidin profile determined by a quadrupole-time-of-flight analyser (ESI-QTOF MS). Main structural characteristics found for U. tomentosa proanthocyanidins were: (a) monomer composition, including pure procyanidins (only composed of (epi)catechin units) and propelargonidins (only composed of (epi)afzelechin units) as well as mixed proanthocyanidins; and (b) degree of polymerization, from 3 up to 11 units. In addition, U. tomentosa phenolic extracts were found to exhibit reasonable antioxidant capacity (ORAC (Oxygen Radical Absorbance Capacity) values between 1.5 and 18.8 mmol TE/g) and antimicrobial activity against potential respiratory pathogens (minimum IC50 of 133 µg/mL). There were also found to be particularly cytotoxic to gastric adenocarcinoma AGS and colon adenocarcinoma SW620 cell lines. The results state the particularities of U. tomentosa proanthocyanidins and suggest the potential value of these extracts with prospective use as functional ingredients.
Collapse
Affiliation(s)
- Mirtha Navarro-Hoyos
- Department of Chemistry, University of Costa Rica (UCR), Sede Rodrigo Facio, San Pedro de Montes de Oca, San José 2060, Costa Rica.
| | - Rosa Lebrón-Aguilar
- Institute of Physical Chemistry "Rocasolano", CSIC,C/ Serrano 119, Madrid 28006, Spain.
| | | | - Carolina Cueva
- Institute of Food Science Research (CIAL), CSIC-UAM, C/ Nicolás Cabrera 9, Madrid 28049, Spain.
| | - David Hevia
- IUOPA-Redox Biology Group, Department of Cellular Morphology and Biology, Faculty of Medicine, University of Oviedo, C/ Julian Claveria 6, Oviedo 33006, Spain.
| | - Silvia Quesada
- Department of Biochemistry, School of Medicine, University of Costa Rica (UCR), Sede Rodrigo Facio, San Pedro de Montes de Oca, San José 2060, Costa Rica.
| | - Gabriela Azofeifa
- Department of Biochemistry, School of Medicine, University of Costa Rica (UCR), Sede Rodrigo Facio, San Pedro de Montes de Oca, San José 2060, Costa Rica.
| | | | - María Monagas
- Institute of Food Science Research (CIAL), CSIC-UAM, C/ Nicolás Cabrera 9, Madrid 28049, Spain.
| | - Begoña Bartolomé
- Institute of Food Science Research (CIAL), CSIC-UAM, C/ Nicolás Cabrera 9, Madrid 28049, Spain.
| |
Collapse
|
10
|
Sowndhararajan K, Santhanam R, Hong S, Jhoo JW, Kim S. Suppressive effects of acetone extract from the stem bark of three Acacia species on nitric oxide production in lipopolysaccharide-stimulated RAW 264.7 macrophage cells. Asian Pac J Trop Biomed 2016. [DOI: 10.1016/j.apjtb.2016.06.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
|
11
|
Song W, Zhu XF, Ding XD, Yang HB, Qin ST, Chen H, Wei SD. Structural features, antioxidant and tyrosinase inhibitory activities of proanthocyanidins in leaves of two tea cultivars. INTERNATIONAL JOURNAL OF FOOD PROPERTIES 2016. [DOI: 10.1080/10942912.2016.1209682] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
|
12
|
Shnawa HA, Jahani Y, Khalaf MN. Rheological properties of PVC stabilized with tannin based epoxy resin as non metallic thermal stabilizer. Polym Bull (Berl) 2016. [DOI: 10.1007/s00289-016-1764-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
13
|
Duval A, Avérous L. Characterization and Physicochemical Properties of Condensed Tannins from Acacia catechu. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:1751-1760. [PMID: 26853705 DOI: 10.1021/acs.jafc.5b05671] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Condensed tannins from Acacia catechu were carefully studied to determine their chemical structure and physicochemical properties. The combined use of MALDI-TOF-MS and (13)C NMR revealed that catechin and epicatechin are the predominant monomers. Most of the compounds were dimers, as confirmed by size exclusion chromatography measurements. To evaluate their potential as aromatic building block in polymer synthesis, special care was given to the characterization and quantification of the different OH groups. A detailed (31)P NMR analysis showed the predominance of catechin, with a catechin/epicatechin ratio of 4.2:1. Two distinct (1)H NMR measurements confirmed the quantification. The thermal properties were also determined: the tannins showed a high temperature of degradation (ca. 190 °C) and a high glass transition temperature (ca. 140 °C), allowing for thermal processing or chemical reactions at relatively high temperature. A. catechu tannins thus present interesting features to be used as aromatic building blocks in polymer materials.
Collapse
Affiliation(s)
- Antoine Duval
- Bioteam/ICPEES-ECPM, UMR 7515, Université de Strasbourg , 25 rue Becquerel, 67087 Strasbourg Cedex 2, France
| | - Luc Avérous
- Bioteam/ICPEES-ECPM, UMR 7515, Université de Strasbourg , 25 rue Becquerel, 67087 Strasbourg Cedex 2, France
| |
Collapse
|
14
|
Yeh TF, Chang MJ, Chang WJ. Comparison of dilute acid and sulfite pretreatments on Acacia confusa for biofuel application and the influence of its extractives. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:10768-75. [PMID: 25318692 DOI: 10.1021/jf504461c] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Chemical components of lignocellulosic biomass may impede biofuel processing efficiency. To understand whether the heartwood of Acacia confusa is suitable for biofuel application, extractive-free heartwood of A. confusa was subjected to dilute acid (DA) or sulfite pretreatments. Sugar recoveries were used to evaluate the performance of different pretreatments. Cell wall properties, such as 4-O-alkylated lignin structures, S/G ratios, and xylan contents, of the pretreated samples showed significant correlations with the enzymatic saccharification of glucan. The 4% bisulfite-pretreated samples produced higher total sugar recoveries than DA-treated samples. The highest total sugar recoveries from DA and sulfite pretreatment were 52.0% (170 °C for 20 min) and 65.3% (4% NaHSO3 and 1% H2SO4), respectively. The results also demonstrated that the existence of extractives in the heartwood of A. confusa hindered the sugar recoveries from both the pretreatments and enzymatic saccharification. Total sugar recoveries were reduced 11.7-17.7% in heartwood samples with extractives.
Collapse
Affiliation(s)
- Ting-Feng Yeh
- School of Forestry and Resource Conservation, National Taiwan University , Number 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan
| | | | | |
Collapse
|
15
|
Guaratini T, Armelini AIPV, Ferrari CR, Schefer RR, Placeres Neto A, Navas R, Reigada JB, Silva DB. Application of matrix-assisted laser-desorption/ionization time-of-flight LIFT for identification of cocoa condensed tannins. JOURNAL OF MASS SPECTROMETRY : JMS 2014; 49:251-255. [PMID: 24619552 DOI: 10.1002/jms.3333] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2013] [Revised: 12/21/2013] [Accepted: 01/02/2014] [Indexed: 06/03/2023]
Affiliation(s)
- Thais Guaratini
- Lychnoflora Pesquisa e Desenvolvimento em Produtos Naturais LTDA, Rua Ângelo Mestriner 263, Ribeirão Preto, SP, Brazil
| | | | | | | | | | | | | | | |
Collapse
|
16
|
Identification of antioxidant components and fatty acid profiles of the leaves and fruits from Averrhoa carambola. Lebensm Wiss Technol 2014. [DOI: 10.1016/j.lwt.2013.08.013] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
17
|
Khoddami A, Wilkes MA, Roberts TH. Techniques for analysis of plant phenolic compounds. Molecules 2013; 18:2328-75. [PMID: 23429347 PMCID: PMC6270361 DOI: 10.3390/molecules18022328] [Citation(s) in RCA: 503] [Impact Index Per Article: 45.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2012] [Revised: 01/10/2013] [Accepted: 01/31/2013] [Indexed: 01/04/2023] Open
Abstract
Phenolic compounds are well-known phytochemicals found in all plants. They consist of simple phenols, benzoic and cinnamic acid, coumarins, tannins, lignins, lignans and flavonoids. Substantial developments in research focused on the extraction, identification and quantification of phenolic compounds as medicinal and/or dietary molecules have occurred over the last 25 years. Organic solvent extraction is the main method used to extract phenolics. Chemical procedures are used to detect the presence of total phenolics, while spectrophotometric and chromatographic techniques are utilized to identify and quantify individual phenolic compounds. This review addresses the application of different methodologies utilized in the analysis of phenolic compounds in plant-based products, including recent technical developments in the quantification of phenolics.
Collapse
Affiliation(s)
- Ali Khoddami
- Department of Plant and Food Sciences, University of Sydney, Sydney, NSW 2006, Australia; E-Mails: (A.K.); (M.A.W.)
| | - Meredith A. Wilkes
- Department of Plant and Food Sciences, University of Sydney, Sydney, NSW 2006, Australia; E-Mails: (A.K.); (M.A.W.)
| | - Thomas H. Roberts
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +61-2-8627-1042; Fax: +61-2-8627-1099
| |
Collapse
|
18
|
Triebwasser DJ, Tharayil N, Preston CM, Gerard PD. The susceptibility of soil enzymes to inhibition by leaf litter tannins is dependent on the tannin chemistry, enzyme class and vegetation history. THE NEW PHYTOLOGIST 2012; 196:1122-1132. [PMID: 23025512 DOI: 10.1111/j.1469-8137.2012.04346.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2012] [Accepted: 08/15/2012] [Indexed: 05/15/2023]
Abstract
By inhibiting soil enzymes, tannins play an important role in soil carbon (C) and nitrogen (N) mineralization. The role of tannin chemistry in this inhibitory process, in conjunction with enzyme classes and isoforms, is less well understood. Here, we compared the inhibition efficiencies of mixed tannins (MTs, mostly limited to angiosperms) and condensed tannins (CTs, produced mostly by gymnosperms) against the potential activity of β-glucosidase (BG), N-acetyl-glucosaminidase (NAG), and peroxidase in two soils that differed in their vegetation histories. Compared with CTs, MTs exhibited 50% more inhibition of almond (Prunus dulcis) BG activity and greater inhibition of the potential NAG activity in the gymnosperm-acclimatized soils. CTs exhibited lower BG inhibition in the angiosperm-acclimated soils, whereas both types of tannins exhibited higher peroxidase inhibition in the angiosperm soils than in gymnosperm soils. At all of the tested tannin concentrations, irrespective of the tannin type and site history, the potential peroxidase activity was inhibited two-fold more than the hydrolase activity and was positively associated with the redox-buffering efficiency of tannins. Our finding that the inhibitory activities and mechanisms of MTs and CTs are dependent on the vegetative history and enzyme class is novel and furthers our understanding of the role of tannins and soil isoenzymes in decomposition.
Collapse
Affiliation(s)
- Daniella J Triebwasser
- School of Agriculture, Forestry and Environmental Sciences, Clemson University, Clemson, SC, 29634, USA
| | - Nishanth Tharayil
- School of Agriculture, Forestry and Environmental Sciences, Clemson University, Clemson, SC, 29634, USA
| | - Caroline M Preston
- School of Agriculture, Forestry and Environmental Sciences, Clemson University, Clemson, SC, 29634, USA
- Natural Resources Canada, Pacific Forestry Centre, Victoria, BC, V8Z 1M5, Canada
| | - Patrick D Gerard
- Mathematical Sciences, Clemson University, Clemson, SC, 29634, USA
| |
Collapse
|
19
|
Sathya A, Siddhuraju P. Role of phenolics as antioxidants, biomolecule protectors and as anti–diabetic factors – Evaluation on bark and empty pods of Acacia auriculiformis. ASIAN PAC J TROP MED 2012; 5:757-65. [DOI: 10.1016/s1995-7645(12)60139-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2012] [Revised: 03/30/2012] [Accepted: 04/07/2012] [Indexed: 11/28/2022] Open
|
20
|
Chai WM, Shi Y, Feng HL, Qiu L, Zhou HC, Deng ZW, Yan CL, Chen QX. NMR, HPLC-ESI-MS, and MALDI-TOF MS analysis of condensed tannins from Delonix regia (Bojer ex Hook.) Raf. and their bioactivities. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2012; 60:5013-22. [PMID: 22515734 DOI: 10.1021/jf300740d] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The structures of the condensed tannins isolated from leaf, fruit, and stem bark of Delonix regia (Bojer ex Hook.) Raf. have been investigated with (13)C nuclear magnetic resonance ((13)C NMR) and high performance liquid chromatography electrospray ionization mass spectrometry (HPLC-ESI-MS) coupled with thiolysis and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) analyses. The results showed that these condensed tannins from D. regia possessed structural heterogeneity in monomer units and degree of polymerization. Propelargonidin (PP) and procyanidin (PC) were found in the leaf, fruit, and stem bark of D. regia, while prodelphinidin (PD) was found only in the leaves. The polymer chain lengths of condensed tannins from leaf and fruit organs were detected to be trimers to hexadecamers but from trimers to tridecamers for stem bark. B-type linkages were present in all these compounds. Condensed tannins from different parts of D. regia can be explored as tyrosinase inhibitors and food antioxidants because of their potent antityrosinase and antioxidant activities. The inhibitor concentration leading to 50% enzyme activity (IC(50)) was estimated to be 38 ± 1, 73 ± 2, and 54 ± 1.5 μg/mL for the condensed tannins of leaf, fruit, and stem bark. Condensed tannins extracted from stem bark exhibited the highest antioxidant activity; the DPPH scavenging activity (IC(50)) and the FRAP values were 90 ± 2 μg/mL and 5.42 ± 0.09 mmol AAE/g, respectively.
Collapse
Affiliation(s)
- Wei-Ming Chai
- School of Life Sciences, Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361005, China
| | | | | | | | | | | | | | | |
Collapse
|
21
|
Wei SD, Zhou HC, Lin YM. Antioxidant activities of fractions of polymeric procyanidins from stem bark of Acacia confusa. Int J Mol Sci 2011; 12:1146-60. [PMID: 21541049 PMCID: PMC3083696 DOI: 10.3390/ijms12021146] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2011] [Revised: 01/30/2011] [Accepted: 02/07/2011] [Indexed: 01/24/2023] Open
Abstract
The polymeric procyanidins extracted from Acacia confusa stem bark were fractionated with a step gradient of water, methanol and acetone on a Sephadex LH-20 column. The antioxidant activity of the collected fractions was investigated by the 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging and ferric reducing/antioxidant power (FRAP) assays. All fractions possessed potent antioxidant activity with the highest activity observed for fraction F9. The matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) and reversed-phase high performance liquid chromatography (RP-HPLC) analyses suggested that the collected fractions consisted primarily of oligomeric and polymeric procyanidins, with different polymer ranges and most abundant polymer size. For each fraction, catechin and epicatechin were present as both terminal and extension units, and epicatechin was the major component in the extended chain. The mean degree of polymerization (mDP) of each fraction differed, ranging from 1.68 (fraction F2) to 17.31 (fraction F11). There was a relationship between antioxidant activity (IC50/DPPH and FRAP) and mDP (R(2) (DPPH) = 0.861, P = 0.006 and R(2) (FRAP) = 0.608, P = 0.038), respectively. However, the highest antioxidant activity of fraction (F9) was not coincident with the maximum mDP of fraction (F11).
Collapse
Affiliation(s)
- Shu-Dong Wei
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, School of Life Sciences, Xiamen University, Xiamen 361005, China; E-Mails: (S.-D.W.); (H.-C.Z.)
| | | | | |
Collapse
|
22
|
Wei SD, Zhou HC, Lin YM. Antioxidant activities of extract and fractions from the hypocotyls of the mangrove plant Kandelia candel. Int J Mol Sci 2010; 11:4080-93. [PMID: 21152321 PMCID: PMC2996807 DOI: 10.3390/ijms11104080] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2010] [Revised: 10/17/2010] [Accepted: 10/19/2010] [Indexed: 11/22/2022] Open
Abstract
The antioxidant activities of 70% acetone extract (70% AE) from the hypocotyls of the mangrove plant Kandelia candel and its fractions of petroleum ether (PF), ethyl acetate (EF), water (WF), and the LF (WF fraction further purified through a Sephadex LH-20 column), were investigated by the 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging and ferric reducing/antioxidant power (FRAP) assays. The results showed that all the extract and fractions possessed potent antioxidant activity. There was a significant linear correlation between the total phenolics concentration and the ferric reducing power or free radical scavenging activity of the extract and fractions. Among the extract and fractions, the LF fraction exhibits the best antioxidant performance. The MALDT-TOF MS and HPLC analyses revealed that the phenolic compounds associated with the antioxidant activity of the LF fraction contains a large number of procyanidins and a small amount of prodelphinidins, and the epicatechin is the main extension unit.
Collapse
Affiliation(s)
| | | | - Yi-Ming Lin
- * Author to whom correspondence should be addressed; E-Mail: ; Tel.: +86-592-2187-657
| |
Collapse
|