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Zhang YQ, Liu Y, Zhang ZP, Wu DD, Zhuang LX, Algradi AM, Kuang HX, Yang BY. Schisandraceae triterpenoids: A review of phytochemistry, bioactivities and synthesis. Fitoterapia 2022; 161:105230. [DOI: 10.1016/j.fitote.2022.105230] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 05/30/2022] [Accepted: 06/02/2022] [Indexed: 11/17/2022]
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Comparative study of the photo‑protective and anti‑melanogenic properties of gomisin D, J and O. Mol Med Rep 2021; 25:8. [PMID: 34751410 PMCID: PMC8600414 DOI: 10.3892/mmr.2021.12524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Accepted: 10/20/2021] [Indexed: 11/18/2022] Open
Abstract
Skin cancer is the most common human malignancy worldwide and solar ultraviolet (UV) radiation is known to serve an important role in its pathogenesis. Natural candidate compounds with antioxidant, photoprotective and anti-melanogenic effects were investigated against the background of skin photoprotective and anti-melanogenic properties. Gomisin D, J and O are dibenzocyclooctadiene lignans present in Kadsura medicinal plants and possess several pharmacological activities. In this study, the functions and mechanisms underlying the effects of gomisin D, J and O in UVA-and UVB-irradiated keratinocytes and α-melanocyte stimulating hormone (α-MSH)-stimulated melanocytes were explored. Following UVA and UVB irradiation, keratinocytes were treated with gomisin D, J and O, and keratinocyte viability, lactate dehydrogenase (LDH) release, intracellular reactive oxygen species (ROS) production and apoptosis were examined. The results demonstrated that gomisin D and J improved keratinocyte viability and reduced LDH release under UVA and UVB irradiation. Intracellular ROS production induced by UVA and UVB irradiation was suppressed by gomisin D and J. In addition, Annexin V and TUNEL staining analysis indicated that gomisin D and J have significant anti-apoptotic effects on UVA-and UVB-irradiated keratinocytes. After α-MSH stimulation, melanocytes were treated with gomisin D, J and O, and the changes in melanocyte viability, intracellular melanin content, intracellular tyrosinase activity, and mechanisms underlying these changes were examined. Gomisin D markedly inhibited the α-MSH-induced increase in intracellular melanin content and tyrosinase activity. Mechanistically, gomisin D reduced the protein and mRNA expression levels of microphthalmia-associated transcription factor (MITF), tyrosinase, tyrosinase-related protein (TRP)-1 and TRP-2 in α-MSH-stimulated melanocytes. In addition, gomisin D markedly downregulated α-MSH-induced phosphorylation of protein kinase A and cAMP response element binding protein, which are known to be present upstream of the MITF, tyrosinase, TRP-1 and TRP-2 genes. Overall, gomisin D has photoprotective and anti-melanogenic effects; these findings provide a basis for the production of potential brightening and photoprotective agents using natural compounds such as gomisin D.
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Zhao T, Ma C, Zhu G. Chemical Composition and Biological Activities of Essential Oils from the Leaves, Stems, and Roots of Kadsura coccinea. Molecules 2021; 26:6259. [PMID: 34684838 PMCID: PMC8537082 DOI: 10.3390/molecules26206259] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Revised: 10/06/2021] [Accepted: 10/13/2021] [Indexed: 12/02/2022] Open
Abstract
The chemical composition and biological activities of the essential oils from the leaves, stems, and roots of Kadsura coccinea (K. coccinea) were investigated. The essential oils were extracted by hydro distillation and analyzed by gas chromatography mass spectrometry (GC-MS) and gas chromatography with flame ionization detector (GC-FID). Antioxidant activities of the essential oils were examined with DPPH radical scavenging assay, ABTS cation radical scavenging assay, and ferric reducing antioxidant power assay. Antimicrobial activities were evaluated by determining minimum inhibitory concentrations (MIC) and minimum microbiocidal concentrations (MMC). Acetylcholinesterase and butyrylcholinesterase inhibitory activity of the essential oils were also tested. A total of 46, 44, and 47 components were identified in the leaf, stem, and root oils, representing 95.66%, 97.35%, and 92.72% of total composition, respectively. The major compounds of three essential oils were α-pinene (16.60-42.02%), β-pinene (10.03-18.82%), camphene (1.56-10.95%), borneol (0.50-7.71%), δ-cadinene (1.52-7.06%), and β-elemene (1.86-4.45%). The essential oils were found to have weak antioxidant activities and cholinesterase inhibition activities. The essential oils showed more inhibitory effects against Staphylococcus aureus (S. aureus) than those of other strains. The highest antimicrobial activity was observed in the root oil against S. aureus, with MIC of 0.78 mg/mL. Therefore, K. coccinea essential oils might be considered as a natural antibacterial agent against S. aureus with potential application in food and pharmaceutical industries.
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Affiliation(s)
- Tianming Zhao
- College of Food and Pharmaceutical Engineering, Guizhou Institute of Technology, Guiyang 550003, China; (C.M.); (G.Z.)
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Tamfu AN, Kucukaydin S, Yeskaliyeva B, Ozturk M, Dinica RM. Non-Alkaloid Cholinesterase Inhibitory Compounds from Natural Sources. Molecules 2021; 26:5582. [PMID: 34577053 PMCID: PMC8472022 DOI: 10.3390/molecules26185582] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 09/08/2021] [Accepted: 09/10/2021] [Indexed: 01/12/2023] Open
Abstract
Alzheimer's disease (AD) is a severe neurodegenerative disorder of different brain regions accompanied by distresses and affecting more than 25 million people in the world. This progressive brain deterioration affects the central nervous system and has negative impacts on a patient's daily activities such as memory impairment. The most important challenge concerning AD is the development of new drugs for long-term treatment or prevention, with lesser side effects and greater efficiency as cholinesterases inhibitors and the ability to remove amyloid-beta(Aβ) deposits and other related AD neuropathologies. Natural sources provide promising alternatives to synthetic cholinesterase inhibitors and many have been reported for alkaloids while neglecting other classes with potential cholinesterase inhibition. This review summarizes information about the therapeutic potential of small natural molecules from medicinal herbs, belonging to terpenoids, coumarins, and phenolic compounds, and others, which have gained special attention due to their specific modes of action and their advantages of low toxicity and high efficiency in the treatment of AD. Some show superior drug-like features in comparison to synthetic cholinesterase inhibitors. We expect that the listed phytoconstituents in this review will serve as promising tools and chemical scaffolds for the discovery of new potent therapeutic leads for the amelioration and treatment of Alzheimer's disease.
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Affiliation(s)
- Alfred Ngenge Tamfu
- School of Chemical Engineering and Mineral Industries, University of Ngaoundere, 454 Ngaoundere, Cameroon
- Department of Chemistry, Mugla Sitki Kocman University, Mugla 48000, Turkey; (B.Y.); (M.O.)
| | - Selcuk Kucukaydin
- Department of Medical Services and Techniques, Koycegiz Vocational School of Health Services, Mugla Sitki Kocman University, Mugla 48800, Turkey;
| | - Balakyz Yeskaliyeva
- Department of Chemistry, Mugla Sitki Kocman University, Mugla 48000, Turkey; (B.Y.); (M.O.)
- Faculty of Chemistry and Chemical Technology, Al-Farabi Kazakh National University, Almaty 050040, Kazakhstan
| | - Mehmet Ozturk
- Department of Chemistry, Mugla Sitki Kocman University, Mugla 48000, Turkey; (B.Y.); (M.O.)
| | - Rodica Mihaela Dinica
- Department of Chemistry, Physics and Environment, Faculty of Sciences and Environment, Dunarea de Jos University, 47 Domneasca Str., 800008 Galati, Romania
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Jeon JS, Kang HM, Park JH, Kang JS, Lee YJ, Park YH, Je BI, Park SY, Choi YW. A Comparative Study on Photo-Protective and Anti-Melanogenic Properties of Different Kadsura coccinea Extracts. PLANTS (BASEL, SWITZERLAND) 2021; 10:1633. [PMID: 34451678 PMCID: PMC8401305 DOI: 10.3390/plants10081633] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 08/05/2021] [Accepted: 08/05/2021] [Indexed: 12/21/2022]
Abstract
Kadsura coccinea (KC), a beneficial plant for human health, has been used for centuries in China, Thailand, and Korea in folk medicine and food. There is evidence supporting the biological effects of highly bioactive ingredients in KC such as lignans, triterpenoids, flavonoids, phenolic acids, steroids, and amino acids. In this study, we aimed to explore the effects, functions, and mechanisms of the extracts from KC root (KCR), stem (KCS), leaf (KCL), and fruit (KCF) in UVA and UVB-irradiated keratinocytes and α-melanocyte stimulating hormone (α-MSH)-stimulated melanocytes. First, the total polyphenol and flavonoid contents of KCR, KCS, KCL, and KCF and their radical scavenging activities were investigated. These parameters were found to be in the following order: KCL > KCR > KCS > KCF. UVA and UVB-irradiated keratinocytes were treated with KCR, KCS, KCL, and KCF, and keratinocyte viability, LDH release, intracellular ROS production, and apoptosis were examined. Our results demonstrated that KC extracts improved keratinocyte viability and reduced LDH release, intracellular ROS production, and apoptosis in the presence UVA and UVB irradiation. The overall photoprotective activity of the KC extracts was confirmed in the following order: KCL > KCR > KCS > KCF. Moreover, KC extracts significantly decreased the intracellular melanin content and tyrosinase activity in α-MSH-stimulated melanocytes. Mechanistically, KC extracts reduced the protein and mRNA expression levels of tyrosinase, tyrosinase-related protein-1 (TRP-1), and tyrosinase-related protein-2 (TRP-2) in α-MSH-stimulated melanocytes. In addition, these extracts markedly downregulated myophthalmosis-related transcription factor expression and cAMP-related binding protein phosphorylation, which is upstream of the regulation of Tyrosinase, TRP-1, and TRP-2. The overall anti-melanogenic activity of the KC extracts was established in the following order. KCL > KCR > KCS > KCF. Overall, the KC extracts exert photoprotective and anti-melanogenic effects, providing a basis for developing potential skin-whitening and photoprotective agents.
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Affiliation(s)
- Joong Suk Jeon
- Department of Horticultural Bioscience, Pusan National University, Myrang 627-706, Korea; (J.S.J.); (H.M.K.); (J.H.P.); (J.S.K.); (Y.J.L.); (Y.H.P.); (B.I.J.)
| | - He Mi Kang
- Department of Horticultural Bioscience, Pusan National University, Myrang 627-706, Korea; (J.S.J.); (H.M.K.); (J.H.P.); (J.S.K.); (Y.J.L.); (Y.H.P.); (B.I.J.)
| | - Ju Ha Park
- Department of Horticultural Bioscience, Pusan National University, Myrang 627-706, Korea; (J.S.J.); (H.M.K.); (J.H.P.); (J.S.K.); (Y.J.L.); (Y.H.P.); (B.I.J.)
| | - Jum Soon Kang
- Department of Horticultural Bioscience, Pusan National University, Myrang 627-706, Korea; (J.S.J.); (H.M.K.); (J.H.P.); (J.S.K.); (Y.J.L.); (Y.H.P.); (B.I.J.)
| | - Yong Jae Lee
- Department of Horticultural Bioscience, Pusan National University, Myrang 627-706, Korea; (J.S.J.); (H.M.K.); (J.H.P.); (J.S.K.); (Y.J.L.); (Y.H.P.); (B.I.J.)
| | - Young Hoon Park
- Department of Horticultural Bioscience, Pusan National University, Myrang 627-706, Korea; (J.S.J.); (H.M.K.); (J.H.P.); (J.S.K.); (Y.J.L.); (Y.H.P.); (B.I.J.)
| | - Byoung Il Je
- Department of Horticultural Bioscience, Pusan National University, Myrang 627-706, Korea; (J.S.J.); (H.M.K.); (J.H.P.); (J.S.K.); (Y.J.L.); (Y.H.P.); (B.I.J.)
| | - Sun Young Park
- Bio-IT Fusion Technology Research Institute, Pusan National University, Busan 609-735, Korea
| | - Young Whan Choi
- Department of Horticultural Bioscience, Pusan National University, Myrang 627-706, Korea; (J.S.J.); (H.M.K.); (J.H.P.); (J.S.K.); (Y.J.L.); (Y.H.P.); (B.I.J.)
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Gao J, Xiong K, Zhou W, Li W. Extensive Metabolite Profiling in the Unexploited Organs of Black Tiger for Their Potential Valorization in the Pharmaceutical Industry. Life (Basel) 2021; 11:544. [PMID: 34200589 PMCID: PMC8229443 DOI: 10.3390/life11060544] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 05/31/2021] [Accepted: 06/08/2021] [Indexed: 11/17/2022] Open
Abstract
Black tiger (Kadsura coccinea (Lem.)) has been reported to hold enormous pharmaceutical potential. The fruit and rhizome of black tiger are highly exploited in the pharmaceutical and other industries. However, the most important organs from the plant such as the leaf and stem are considered biowastes mainly because a comprehensive metabolite profile has not been reported in these organs. Knowledge of the metabolic landscape of the unexploited black tiger organs could help identify and isolate important compounds with pharmaceutical and nutritional values for a better valorization of the species. In this study, we used a widely targeted metabolomics approach to profile the metabolomes of the K. coccinea leaf (KL) and stem (KS) and compared them with the root (KR). We identified 642, 650 and 619 diverse metabolites in KL, KS and KR, respectively. A total of 555 metabolites were mutually detected among the three organs, indicating that the leaf and stem organs may also hold potential for medicinal, nutritional and industrial applications. Most of the differentially accumulated metabolites between organs were enriched in flavone and flavonol biosynthesis, phenylpropanoid biosynthesis, arginine and proline metabolism, arginine biosynthesis, tyrosine metabolism and 2-oxocarboxylic acid metabolism pathways. In addition, several important organ-specific metabolites were detected in K. coccinea. In conclusion, we provide extensive metabolic information to stimulate black tiger leaf and stem valorization in human healthcare and food.
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Affiliation(s)
- Jianfei Gao
- Institute of Mountain Resources, Guizhou Academy of Sciences, Guiyang 550001, China; (J.G.); (W.L.)
| | - Kangning Xiong
- State Engineering Technology Institute for Karst Desertification Control of China, School of Karst Science, Guizhou Normal University, Guiyang 550001, China
| | - Wei Zhou
- Guizhou Industry Polytechnic College, Guiyang 550008, China;
| | - Weijie Li
- Institute of Mountain Resources, Guizhou Academy of Sciences, Guiyang 550001, China; (J.G.); (W.L.)
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Xia Z, Hao E, Chen Z, Zhang M, Wei Y, Wei M, Hou X, Du Z, Deng J. Roots and stems of Kadsura coccinea extract induced developmental toxicity in zebrafish embryos/larvae through apoptosis and oxidative stress. PHARMACEUTICAL BIOLOGY 2020; 58:1294-1301. [PMID: 33355515 PMCID: PMC7759282 DOI: 10.1080/13880209.2020.1859553] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2020] [Revised: 10/30/2020] [Accepted: 11/24/2020] [Indexed: 05/31/2023]
Abstract
CONTEXT Although the roots and stems of Kadsura coccinea (Lem.) A. C. Smith. [Schisandraceae] are herbs and traditional foods in Li nationality, its toxicity remains unclear. OBJECTIVE To study developmental toxicity of K. coccinea consumption and explain underlying mechanisms. MATERIALS AND METHODS Zebrafish were applied to assess LC50 values of hydroethanol extract (KCH) and water extract (KCW) of Kadsura coccinea. In further study, three concentrations groups of KCH (3.75, 7.5 and 15 μg/mL for embryo, 7.5, 15 and 30 μg/mL for larvae) and control group (n = 30) were administered. At specific stages of zebrafish development, spontaneous movement, hatching rate, etc., were measured. Gene expressions related to developmental toxicity were examined. RESULTS The LC50 value of KCH (24 or 45 μg/mL) was lower than KCW (1447 or 2011 μg/mL) in embryos or larvae. The inhibited spontaneous movement (20%), hatching rate (20%), body length (12%) and eye area (30%) were observed after KCH treatment. Moreover, the decreased liver areas (25%) and fluorescence intensity (33%), increased ALT (37%) and AST levels (42%) were found in larvae treated with KCH (30 μg/mL). The increased ROS (89%), MDA concentrations (30%), apoptosis generation (62%) and decreased T-SOD activity (16%) were also observed. The represented genes of developmental hepatotoxicity, oxidative stress and apoptosis in zebrafish were activated after KCH (15 or 30 μg/mL) treatment. DISCUSSION AND CONCLUSIONS These results demonstrate that KCH has developmental toxicity on zebrafish. Our study provides a scientific basis for further research on the toxicity of Kadsura coccinea.
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Affiliation(s)
- Zhongshang Xia
- College of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, China
| | - Erwei Hao
- Guangxi Key Laboratory of Efficacy Study on Chinese Materia Medica, Guangxi University of Chinese Medicine, Nanning, China
- Guangxi Collaborative Innovation Center for Research on Functional Ingredients of Agricultural Residues, Guangxi University of Chinese Medicine, Nanning, China
| | - Zhangmei Chen
- Guangxi Key Laboratory of Efficacy Study on Chinese Materia Medica, Guangxi University of Chinese Medicine, Nanning, China
- Guangxi Collaborative Innovation Center for Research on Functional Ingredients of Agricultural Residues, Guangxi University of Chinese Medicine, Nanning, China
| | - Mingzhe Zhang
- Guangxi Key Laboratory of Efficacy Study on Chinese Materia Medica, Guangxi University of Chinese Medicine, Nanning, China
- Guangxi Collaborative Innovation Center for Research on Functional Ingredients of Agricultural Residues, Guangxi University of Chinese Medicine, Nanning, China
| | - Yanting Wei
- Guangxi Key Laboratory of Efficacy Study on Chinese Materia Medica, Guangxi University of Chinese Medicine, Nanning, China
| | - Man Wei
- Guangxi Key Laboratory of Efficacy Study on Chinese Materia Medica, Guangxi University of Chinese Medicine, Nanning, China
- Guangxi Collaborative Innovation Center for Research on Functional Ingredients of Agricultural Residues, Guangxi University of Chinese Medicine, Nanning, China
| | - Xiaotao Hou
- Guangxi Key Laboratory of Efficacy Study on Chinese Materia Medica, Guangxi University of Chinese Medicine, Nanning, China
- Guangxi Collaborative Innovation Center for Research on Functional Ingredients of Agricultural Residues, Guangxi University of Chinese Medicine, Nanning, China
- College of Pharmacy, Guangxi University of Chinese Medicine, Nanning, China
| | - Zhengcai Du
- Guangxi Key Laboratory of Efficacy Study on Chinese Materia Medica, Guangxi University of Chinese Medicine, Nanning, China
- Guangxi Collaborative Innovation Center for Research on Functional Ingredients of Agricultural Residues, Guangxi University of Chinese Medicine, Nanning, China
| | - Jiagang Deng
- Guangxi Key Laboratory of Efficacy Study on Chinese Materia Medica, Guangxi University of Chinese Medicine, Nanning, China
- Guangxi Collaborative Innovation Center for Research on Functional Ingredients of Agricultural Residues, Guangxi University of Chinese Medicine, Nanning, China
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Barrientos RE, Ahmed S, Cortés C, Fernández-Galleguillos C, Romero-Parra J, Simirgiotis MJ, Echeverría J. Chemical Fingerprinting and Biological Evaluation of the Endemic Chilean Fruit Greigia sphacelata (Ruiz and Pav.) Regel (Bromeliaceae) by UHPLC-PDA-Orbitrap-Mass Spectrometry. Molecules 2020; 25:E3750. [PMID: 32824604 PMCID: PMC7464012 DOI: 10.3390/molecules25163750] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 08/07/2020] [Accepted: 08/14/2020] [Indexed: 01/10/2023] Open
Abstract
Greigia sphacelata (Ruiz and Pav.) Regel (Bromeliaceae) is a Chilean endemic plant popularly known as "quiscal" and produces an edible fruit consumed by the local Mapuche communities named as "chupón". In this study, several metabolites including phenolic acids, organic acids, sugar derivatives, catechins, proanthocyanidins, fatty acids, iridoids, coumarins, benzophenone, flavonoids, and terpenes were identified in G. sphacelata fruits using ultrahigh performance liquid chromatography-photodiode array detection coupled with a Orbitrap mass spectrometry (UHPLC-PDA-Orbitrap-MS) analysis for the first time. The fruits showed moderate antioxidant capacities (i.e., 487.11 ± 26.22 μmol TE/g dry weight) in the stable radical DPPH assay, 169.08 ± 9.81 TE/g dry weight in the ferric reducing power assay, 190.32 ± 6.23 TE/g dry weight in the ABTS assay, and 76.46 ± 3.18% inhibition in the superoxide anion scavenging assay. The cholinesterase inhibitory potential was evaluated against acetylcholinesterase (AChE) and butyrylcholinesterase (BChE). From the findings, promising results were observed for pulp and seeds. Our findings suggest that G. sphacelata fruits are a rich source of diverse secondary metabolites with antioxidant capacities. In addition, the inhibitory effects against AChE and BChE suggest that natural products or food supplements derived from G. sphacelata fruits are of interest for their neuroprotective potential.
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Affiliation(s)
- Ruth E. Barrientos
- Instituto de Farmacia, Facultad de Ciencias, Universidad Austral de Chile, Valdivia 5090000, Chile; (R.E.B.); (S.A.); (C.C.); (C.F.-G.)
| | - Shakeel Ahmed
- Instituto de Farmacia, Facultad de Ciencias, Universidad Austral de Chile, Valdivia 5090000, Chile; (R.E.B.); (S.A.); (C.C.); (C.F.-G.)
| | - Carmen Cortés
- Instituto de Farmacia, Facultad de Ciencias, Universidad Austral de Chile, Valdivia 5090000, Chile; (R.E.B.); (S.A.); (C.C.); (C.F.-G.)
| | - Carlos Fernández-Galleguillos
- Instituto de Farmacia, Facultad de Ciencias, Universidad Austral de Chile, Valdivia 5090000, Chile; (R.E.B.); (S.A.); (C.C.); (C.F.-G.)
| | - Javier Romero-Parra
- Departamento de Química Orgánica y Fisicoquímica, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Olivos 1007, Casilla 233, Santiago 8380544, Chile;
| | - Mario J. Simirgiotis
- Instituto de Farmacia, Facultad de Ciencias, Universidad Austral de Chile, Valdivia 5090000, Chile; (R.E.B.); (S.A.); (C.C.); (C.F.-G.)
| | - Javier Echeverría
- Departamento de Ciencias del Ambiente, Facultad de Química y Biología, Universidad de Santiago de Chile, Casilla 40, Correo 33, Santiago 9170002, Chile
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