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Hamedi A, Bayat M, Asemani Y, Amirghofran Z. A review of potential anti-cancer properties of some selected medicinal plants grown in Iran. J Herb Med 2022. [DOI: 10.1016/j.hermed.2022.100557] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Javaid A, Zahra D, Rashid F, Mashraqi M, Alzamami A, Khurshid M, Ali Ashfaq U. Regulation of micro-RNA, epigenetic factor by natural products for the treatment of cancers: Mechanistic insight and translational Association. Saudi J Biol Sci 2022; 29:103255. [PMID: 35495735 PMCID: PMC9052154 DOI: 10.1016/j.sjbs.2022.03.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 02/26/2022] [Accepted: 03/02/2022] [Indexed: 02/07/2023] Open
Abstract
From onset to progression, cancer is a ailment that might take years to grow. All common epithelial malignancies, have a long latency period, frequently 20 years or more, different gene may contain uncountable mutations if they are clinically detectable. MicroRNAs (miRNAs) are around 22nt non-coding RNAs that control gene expression sequence-specifically through translational inhibition or messenger degradation of RNA (mRNA). Epigenetic processes of miRNA control genetic variants through genomic DNA methylation, post-translation histone modification, rework of the chromatin, and microRNAs. The field of miRNAs has opened a new era in understanding small non-coding RNAs since discovering their fundamental mechanisms of action. MiRNAs have been found in viruses, plants, and animals through molecular cloning and bioinformatics approaches. Phytochemicals can invert the epigenetic aberrations, a leading cause of the cancers of various organs, and act as an inhibitor of these changes. The advantage of phytochemicals is that they only function on cells that cause cancer without affecting normal cells. Phytochemicals appear to play a significant character in modulating miRNA expression, which is linked to variations in oncogenes, tumor suppressors, and cancer-derived protein production, according to several studies. In addition to standard anti-oxidant or anti-inflammatory properties, the initial epigenetic changes associated with cancer prevention may be modulated by many polyphenols. In correlation with miRNA and epigenetic factors to treat cancer some of the phytochemicals, including polyphenols, curcumin, resveratrol, indole-3-carbinol are studied in this article.
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Cansaran-Duman D, Yangın S, Çolak B. The role of vulpinic acid as a natural compound in the regulation of breast cancer-associated miRNAs. Biol Res 2021; 54:37. [PMID: 34743742 PMCID: PMC8574026 DOI: 10.1186/s40659-021-00360-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Accepted: 10/27/2021] [Indexed: 12/30/2022] Open
Abstract
Background Breast cancer is the most frequently diagnosed cancer, and no effective treatment solution has yet been found. The number of studies based on the research of novel natural compounds in the treatment of breast cancer has been increasing in recent years. The anticancer properties of natural compounds are related to the regulation of microRNA (miRNA) expression. Therefore, changing the profile of miRNAs with the use of natural products is very important in cancer treatment. However, the role of vulpinic acid and related miRNAs in breast cancer progression remains unknown. Vulpinic acid, methyl (as2E)-2-(3-hydroxy-5-oxo-4-phenylfuran-2-ylidene)-2 phenylacetate, is a natural product extracted from the lichen species and shows an anticancer effect on different cancer cells. Methods This study examines the effects of vulpinic acid on the miRNA levels of breast cancer (MCF-7) cells and its relationship with cell proliferation and apoptosis levels. The antiproliferative effect of vulpinic acid was screened against MCF-7 breast cancer cells and MCF-12A breast epithelial cells using the xCELLigence real-time cell analysis system. We analyzed the altered miRNA expression profile in MCF-7 breast cancer cells versus MCF-12A cells following their response to vulpinic acid through microarray analysis. The microarray analysis results were confirmed through quantitative real-time PCR and bioinformatics analysis. Results The results of the miRNA array and bioinformatic analyses demonstrated that 12 miRNAs were specifically responsive to vulpinic acid in MCF-7 breast cancer cells. This is the first study to reveal that vulpinic acid inhibits the expression of 12 miRNAs and suppresses breast cancer cell proliferation. The study also revealed that vulpinic acid may downregulate the expression of 12 miRNAs by repressing the FOXO-3 gene. The miRNA targets were mainly found to play a role in the apoptosis, cell cycle and MAPK pathways. Moreover, Bcl-2, Bax, procaspase-3 and procaspase-9 protein levels were assessed by western blot analysis for validation of apoptosis at the protein level. Conclusion This study revealed the molecular mechanisms of vulpinic acid on breast cancer and showed that vulpinic acid regulates apoptosis signaling pathways by decreasing the expression of miRNAs. The miRNA expression patterns illuminate the underlying effect of vulpinic acid in breast cancer treatment. Graphical Abstract ![]()
Supplementary Information The online version contains supplementary material available at 10.1186/s40659-021-00360-4.
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Affiliation(s)
| | - Sevcan Yangın
- Ankara University, Biotechnology Institute, Keçiören, Ankara, 06135, Turkey
| | - Betül Çolak
- Ankara University, Biotechnology Institute, Keçiören, Ankara, 06135, Turkey
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Zhoushi Qiling decoction induces apoptosis of human prostate cancer cells via miR-143/Bcl-2 axis. Aging (Albany NY) 2021; 13:17202-17210. [PMID: 34170852 PMCID: PMC8312453 DOI: 10.18632/aging.203171] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Accepted: 05/18/2021] [Indexed: 11/30/2022]
Abstract
A number of traditional Chinese medicines (TCMs) are widely used in prostate cancer treatment in China. The aim of this study was to test the efficacy of a TCM, Zhoushi Qiling Decoction (ZQD), in combination with androgen deprivation therapy (ADT) and explore its underlying mechanism. A total of 151 patients were recruited to receive ADT treatment or ADT+ZQD treatment. The survival of patients who received ADT+ZQD treatment was significantly higher than those who received ADT therapy only. DU145 prostate cancer cells were treated with ZQD (50 mg/mL) for 24 h in vitro and expression levels of an array of miRNAs were examined. Our results suggested that miR-143 demonstrated prominent upregulation in DU145 cells after treatment with ZQD. In patient serum samples, miR-143 expression was also significantly upregulated after ADT+ZQE treatment, which was however absent in patients treated with ADT only. In DU145 cells, ZQD treatment led to a dose-dependent increase in apoptosis, which could be reduced by anti-miR-143 treatment. There was a binding site between miR-143 and B cell CLL/lymphoma-2 (Bcl-2) and ZQD treatment reduced Bcl-2 expression. ZQD treatment led to increased caspase-3 and Bax expression. ZQD treatment could promote apoptosis of prostate cancer cells by promoting miR-143 upregulation, which could be a possible mechanism underlying the inhibitory effect of ZQD in prostate cancer in patient.
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Akone SH, Ntie-Kang F, Stuhldreier F, Ewonkem MB, Noah AM, Mouelle SEM, Müller R. Natural Products Impacting DNA Methyltransferases and Histone Deacetylases. Front Pharmacol 2020; 11:992. [PMID: 32903500 PMCID: PMC7438611 DOI: 10.3389/fphar.2020.00992] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2020] [Accepted: 06/19/2020] [Indexed: 12/24/2022] Open
Abstract
Epigenetics refers to heritable changes in gene expression and chromatin structure without change in a DNA sequence. Several epigenetic modifications and respective regulators have been reported. These include DNA methylation, chromatin remodeling, histone post-translational modifications, and non-coding RNAs. Emerging evidence has revealed that epigenetic dysregulations are involved in a wide range of diseases including cancers. Therefore, the reversible nature of epigenetic modifications concerning activation or inhibition of enzymes involved could be promising targets and useful tools for the elucidation of cellular and biological phenomena. In this review, emphasis is laid on natural products that inhibit DNA methyltransferases (DNMTs) and histone deacetylases (HDACs) making them promising candidates for the development of lead structures for anticancer-drugs targeting epigenetic modifications. However, most of the natural products targeting HDAC and/or DNMT lack isoform selectivity, which is important for determining their potential use as therapeutic agents. Nevertheless, the structures presented in this review offer the well-founded basis that screening and chemical modifications of natural products will in future provide not only leads to the identification of more specific inhibitors with fewer side effects, but also important features for the elucidation of HDAC and DNMT function with respect to cancer treatment.
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Affiliation(s)
- Sergi Herve Akone
- Department of Chemistry, Faculty of Science, University of Douala, Douala, Cameroon
- Department of Microbial Natural Products, Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Centre for Infection Research and Department of Pharmacy, Saarland University, Saarbrücken, Germany
| | - Fidele Ntie-Kang
- Department of Chemistry, Faculty of Science, University of Buea, Buea, Cameroon
- Institute for Pharmacy, Martin-Luther-Universität Halle-Wittenberg, Halle (Saale), Germany
- Institut für Botanik, Technische Universität Dresden, Dresden, Germany
| | - Fabian Stuhldreier
- Medical Faculty, Institute of Molecular Medicine I, Heinrich Heine University Düsseldorf, Düsseldorf, Germany
| | | | - Alexandre Mboene Noah
- Department of Biochemistry, Faculty of Science, University of Douala, Douala, Cameroon
| | | | - Rolf Müller
- Department of Microbial Natural Products, Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Centre for Infection Research and Department of Pharmacy, Saarland University, Saarbrücken, Germany
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Pathania S, Bansal P, Gupta P, Rawal RK. Genus Calotropis: A Hub of Medicinally Active Phytoconstituents. CURRENT TRADITIONAL MEDICINE 2020. [DOI: 10.2174/2215083805666190619095933] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Traditional medicines derived from plant and other natural sources have several
advantages over synthetic drugs when used for the management of pathological conditions.
Natural product based therapies are safer than synthetic drugs-based chemotherapies. One of
such sources of bioactive molecules includes C. procera and C. gigantea, flowering herbal
plants, belonging to the genus Calotropis, family Apocynaceae, which, due to their diverse
pharmacological profile, have been widely employed in Ayurveda, Unani, Siddha and other
traditional systems for the treatment of various diseases. The various parts of this plant are
rich in phytoconstituents such as cardiac glycosides, flavonoids, terpenoids, steroids, phenolic
compounds, proteins etc. Due to the presence of multiple constituents, this plant possess
diverse biological activities such as analgesic, antitumor, antihelmintic, antioxidant, hepatoprotective,
antidiarrhoeal, anticonvulsant, antimicrobial, oestrogenic, antinociceptive, antimalarial
activity etc. The present review provides comprehensive information about various
phytochemical constituents of the plant along with their medicinal importance.
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Affiliation(s)
- Shelly Pathania
- Research Scholar, Department of Pharmaceutical Sciences and Technology, Maharaja Ranjit Singh Punjab Technical University, Bathinda (Punjab) 151001, India
| | - Parveen Bansal
- University Centre of Excellence in Research, Baba Farid University of Health Sciences, Faridkot, Punjab, India
| | - Prasoon Gupta
- Natural Product Chemistry Division, Indian Institute of Integrative Medicine, Canal Road, Jammu-180001, India
| | - Ravindra K. Rawal
- Department of Chemistry, Maharishi Markandeshwar (Deemed to be University), Mullana-133207, Ambala, Haryana, India
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Ahmed F, Ijaz B, Ahmad Z, Farooq N, Sarwar MB, Husnain T. Modification of miRNA Expression through plant extracts and compounds against breast cancer: Mechanism and translational significance. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2020; 68:153168. [PMID: 31982837 DOI: 10.1016/j.phymed.2020.153168] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 01/02/2020] [Accepted: 01/04/2020] [Indexed: 06/10/2023]
Abstract
BACKGROUND Cancer is hyper-proliferative, multi-factorial and multi-step, heterogeneous group of molecular disorders. It is the second most reported disease after heart diseases. Breast carcinoma is the foremost death causing disease in female population worldwide. Cancer can be controlled by regulating the gene expression. Current therapeutic options are associated with severe side effects and are expensive for the people living in under-developed countries. Plant derived substances have potential application against different diseases like cancer, inflammation and viral infections. HYPOTHESIS The mechanism of action of the medicinal plants is largely unknown. Targeting gene network and miRNA using medicinal plants could help in improving the therapeutic options against cancer. METHODS The literature from 135 articles was reviewed by using PubMed, google scholar, Science direct to find out the plants and plant-based compounds against breast cancer and also the studies reporting their mechanistic route of action both at coding and noncoding RNA levels. RESULTS Natural products act as selective inhibitors of the cancerous cells by targeting oncogenes and tumor suppressor genes or altering miRNA expression. Natural compounds like EGCG from tea, Genistein from fava beans, curcumin from turmeric, DIM found in cruciferous, Resveratrol a polyphenol and Quercetin a flavonoid is found in various plants have been studied for their anticancer activity. The EGCG was found to inhibit proliferative activity by modulating miR-16 and miR-21. Similarly, DIM was found to down regulate miR-92a which results to modulate NFkB and stops cancer development. Another plant-based compound Glyceollins found to upregulate miR-181c and miR-181d having role in tumor suppression. It also found to regulate miR-22, 29b and c, miR-30d, 34a and 195. Quercetin having anti-cancer activity induce the apoptosis through regulating miR-16, 26b, 34a, let-7g, 125a and miR-605 and reduce the miRNA expression like miR-146a/b, 503 and 194 which are involved in metastasis. CONCLUSION Targeting miRNA expression using natural plant extracts can have a reverse effect on cell proliferation; turning on and off tumor-inducing and suppressing genes. It can be efficiently adopted as an adjuvant with the conventional form of therapies to increase their efficacy against cancer progression.
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Affiliation(s)
- Fayyaz Ahmed
- National Center of Excellence in Molecular Biology, University of the Punjab Lahore, Pakistan
| | - Bushra Ijaz
- National Center of Excellence in Molecular Biology, University of the Punjab Lahore, Pakistan.
| | - Zarnab Ahmad
- National Center of Excellence in Molecular Biology, University of the Punjab Lahore, Pakistan
| | - Nadia Farooq
- Department of Surgery, Sir Gangaram Hospital Lahore Punjab, Pakistan
| | - Muhammad Bilal Sarwar
- National Center of Excellence in Molecular Biology, University of the Punjab Lahore, Pakistan
| | - Tayyab Husnain
- National Center of Excellence in Molecular Biology, University of the Punjab Lahore, Pakistan
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Yang L, Zhang Y, Yu X. Protective Effect of Obovatol Against MCF-7 Human Breast Adenocarcinoma Cells via Inducing Apoptosis and Cell Cycle Arrest. INT J PHARMACOL 2019. [DOI: 10.3923/ijp.2019.823.828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Li Z, Lin Z, Lu Z, Feng Z, Chen Q, Deng S, Li Z, Yan Y, Ying Z. Coix seed improves growth performance and productivity in post-weaning pigs by reducing gut pH and modulating gut microbiota. AMB Express 2019; 9:115. [PMID: 31338616 PMCID: PMC6650524 DOI: 10.1186/s13568-019-0828-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Accepted: 07/01/2019] [Indexed: 02/08/2023] Open
Abstract
Coix seed has traditionally been used in traditional Chinese medicine to fortify the spleen and inhibit dampness, and has shown anticancer effects in humans. However, it is not known whether coix seed improves post-weaning growth performance and productivity, and the mechanism of interaction between coix seed and gut microbiota remains unknown. In this study, we established four groups: (i) control, (ii) antibiotic-fed, (iii) coix seed powder-fed, and (iv) coix seed extract-fed. The feeding experiment was conducted for 4 weeks. Coix seed extract significantly increased average weight gain and reduced the feed/meat ratio in weaned pigs, in addition to reducing the pH of their gastric juice. Further assays demonstrated that coix seed promotes an increase in the density and length of the gastrointestinal villi. Next, 16s sequencing of gut microbiota showed that coix seed significantly increased the abundance of phylum Bacteroidetes and genus Lactobacillus (p < 0.05) and reduced the abundance of phylum Prevotella (p < 0.05) in the gut microbiota. In contrast, the abundance of phylum Bacteroidetes and genus Lactobacillus decreased in the control group and antibiotic group, whereas the abundance of phylum Prevotella increased. Our findings indicate that coix seed improves growth performance and productivity in post-weaning pigs by reducing the pH value of gastric juice, increasing the density and length of gastrointestinal villi, and modulating gut microbiota. Thus, coix seed has good potential for use as a feed supplement in swine production.
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Esmailpoor A, Ghasemian A, Dehnavi E, Peidayesh H, Teimouri M. Physalis alkekengi hydroalcoholic extract enhances the apoptosis in mouse model of breast cancer cells. GENE REPORTS 2019. [DOI: 10.1016/j.genrep.2019.100366] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Yuan XL, Mao XX, Du YM, Yan PZ, Hou XD, Zhang ZF. Anti-Tumor Activity of Cembranoid-Type Diterpenes Isolated from Nicotiana tabacum L. Biomolecules 2019; 9:E45. [PMID: 30696084 PMCID: PMC6406568 DOI: 10.3390/biom9020045] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 01/17/2019] [Accepted: 01/17/2019] [Indexed: 12/16/2022] Open
Abstract
Recently, the incidence of hepatocellular carcinoma has increased worldwide. Cembranoid-type diterpenes (CBDs) from tobacco exhibit good antimicrobial, antitumor, and neuroprotective activities. Therefore, in this study, we isolated CBDs from Nicotiana tabacum L. and evaluated their antitumor activity against hepatoma cell lines. Particularly, the anti-tumor activity of α-2,7,11-cyprotermine-4,6-diol (α-CBD) was investigated against HepG2, SMMC-7721, and HL-7702 cells. The MTT assay revealed that α-CBD reduced the formation of cell clones and inhibited the proliferation of hepatocellular carcinoma cells. Morphological observations showed that α-CBD altered cell morphology and membrane permeability before inducing apoptosis. To further explore the antitumor mechanism of α-CBD, flow cytometry and transcriptome analysis were performed using HepG2 cells. The results showed that the number of HepG2 cells increased from 10.4% to 29.8%, indicating that α-CBD inhibits the proliferation of hepatocellular carcinoma cells in the S phase. The gene expression analysis of HepG2 cells treated with α-CBD showed 3068 genes with altered expression, among which 1289 were upregulated and 1779 were downregulated. Apoptosis induced by these differentially expressed genes might be mediated by the p53-PUMA, PI3K-Akt, and IL-1-NF-κB-IAP pathways. Comprehensively, our study shows that α-CBD isolated from N. tabacum L. can be potentially used as a natural antitumor agent.
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Affiliation(s)
| | | | | | | | - Xiao-Dong Hou
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China; (X.-L.Y.); (X.-X.M.); (Y.-M.D.); (P.-Z.Y.)
| | - Zhong-Feng Zhang
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences, Qingdao 266101, China; (X.-L.Y.); (X.-X.M.); (Y.-M.D.); (P.-Z.Y.)
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Younas M, Hano C, Giglioli-Guivarc'h N, Abbasi BH. Mechanistic evaluation of phytochemicals in breast cancer remedy: current understanding and future perspectives. RSC Adv 2018; 8:29714-29744. [PMID: 35547279 PMCID: PMC9085387 DOI: 10.1039/c8ra04879g] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Accepted: 08/15/2018] [Indexed: 12/30/2022] Open
Abstract
Breast cancer is one of the most commonly diagnosed cancers around the globe and accounts for a large proportion of fatalities in women. Despite the advancement in therapeutic and diagnostic procedures, breast cancer still represents a major challenge. Current anti-breast cancer approaches include surgical removal, radiotherapy, hormonal therapy and the use of various chemotherapeutic drugs. However, drug resistance, associated serious adverse effects, metastasis and recurrence complications still need to be resolved which demand safe and alternative strategies. In this scenario, phytochemicals have recently gained huge attention due to their safety profile and cost-effectiveness. These phytochemicals modulate various genes, gene products and signalling pathways, thereby inhibiting breast cancer cell proliferation, invasion, angiogenesis and metastasis and inducing apoptosis. Moreover, they also target breast cancer stem cells and overcome drug resistance problems in breast carcinomas. Phytochemicals as adjuvants with chemotherapeutic drugs have greatly enhanced their therapeutic efficacy. This review focuses on the recently recognized molecular mechanisms underlying breast cancer chemoprevention with the use of phytochemicals such as curcumin, resveratrol, silibinin, genistein, epigallocatechin gallate, secoisolariciresinol, thymoquinone, kaempferol, quercetin, parthenolide, sulforaphane, ginsenosides, naringenin, isoliquiritigenin, luteolin, benzyl isothiocyanate, α-mangostin, 3,3'-diindolylmethane, pterostilbene, vinca alkaloids and apigenin.
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Affiliation(s)
- Muhammad Younas
- Department of Biotechnology, Quaid-i-Azam University Islamabad-45320 Pakistan +92-51-90644121 +92-51-90644121 +33-767-97-0619
| | - Christophe Hano
- Laboratoire de Biologie des Ligneux et des Grandes Cultures (LBLGC), Plant Lignans Team, UPRES EA 1207, Université d'Orléans F 28000 Chartres France
| | | | - Bilal Haider Abbasi
- Department of Biotechnology, Quaid-i-Azam University Islamabad-45320 Pakistan +92-51-90644121 +92-51-90644121 +33-767-97-0619
- Laboratoire de Biologie des Ligneux et des Grandes Cultures (LBLGC), Plant Lignans Team, UPRES EA 1207, Université d'Orléans F 28000 Chartres France
- EA2106 Biomolecules et Biotechnologies Vegetales, Universite Francois-Rabelais de Tours Tours France
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Liew SS, Ho WY, Yeap SK, Sharifudin SAB. Phytochemical composition and in vitro antioxidant activities of Citrus sinensis peel extracts. PeerJ 2018; 6:e5331. [PMID: 30083463 PMCID: PMC6078072 DOI: 10.7717/peerj.5331] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Accepted: 07/06/2018] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND Citrus sinensis peels are usually discarded as wastes; however, they are rich sources of Vitamin C, fibre, and many nutrients, including phenolics and flavonoids which are also good antioxidant agents. This study aimed to examine phytochemical composition and antioxidant capabilities of C. sinensis peel extracted conventionally with different methanol/water, ethanol/water, and acetone/water solvents. METHODS C. sinensis peels were subjected to extraction with 100%, 70% and 50% of methanol, ethanol, and acetone, respectively, as well as hot water extraction. Antioxidant activities of the peel extracts were examined via the 2,2-diphenylpicrylhydrazyl (DPPH) free radical scavenging activity, ferric reducing antioxidant power (FRAP) assay, and oxygen radical absorbance capacity (ORAC) assay. Total phenolic content and total flavonoid content of the extracts were measured via the Folin-Ciocalteau method and the aluminium chloride colorimetric method, respectively. Phenolic acid and organic acid composition of the peel extracts were further determined via high performance liquid chromatography (HPLC) while flavonoid content was identified via ultra performance liquid chromatography (UPLC). RESULTS DPPH radical scavenging activity of C. sinensis peel extracts varied from 8.35 to 18.20 mg TE/g, FRAP ranged from 95.00 to 296.61 mmol Fe(II)/g, while ORAC value ranged from 0.31 to 0.92 mol TE/g. Significant level of association between the assays was observed especially between TPC and FRAP (R-square = 0.95, P < 0.0001). TPC of various C. sinensis peel extracts ranged from 12.08 to 38.24 mg GAE/g, with 70% acetone/water extract (AEC) showing the highest TPC. TFC ranged from 1.90 to 5.51 mg CE/g. Extraction yield ranged from 0.33 to 0.54 g/g DW and tended to increase with increasing water concentration in the solvent. In the phytochemical investigation, five phenolic acids were identified using HPLC, including gallic acid, protocatechuic acid, 4-hydroxybenzoic acid, caffeic acid and ferulic acid. A total of five organic acids including lactic acid, citric acid, L-mallic acid, kojic acid and ascorbic acid were quantified via HPLC. In addition, concentrations of six flavonoids including catechin, epigallocatechin, vitexin, rutin, luteolin and apigenin were determined via UPLC. DISCUSSION AND CONCLUSION Phytochemicals including phenolics and flavonoids in C. sinensis peel extracts exhibited good antioxidant properties. Among the extracts, 70% AEC with highest TPC and high TFC content showed greatest antioxidant activity in all three assays. Different phenolic acids, organic acids and flavonoids were also identified from the extracts. This study indicated that C. sinensis peels contained potential antioxidant compounds which could be exploited as value added products in the food industry.
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Affiliation(s)
- Sok Sian Liew
- Department of Biomedical Sciences, The University of Nottingham Malaysia Campus, Semenyih, Selangor, Malaysia
| | - Wan Yong Ho
- Department of Biomedical Sciences, The University of Nottingham Malaysia Campus, Semenyih, Selangor, Malaysia
| | - Swee Keong Yeap
- China-ASEAN College of Marine Sciences, Xiamen University Malaysia, Sepang, Selangor, Malaysia
| | - Shaiful Adzni Bin Sharifudin
- Department of Biomedical Sciences, The University of Nottingham Malaysia Campus, Semenyih, Selangor, Malaysia
- Biotechnology Research Centre, Malaysian Agricultural Research and Development Institute (MARDI), Serdang, Selangor, Malaysia
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