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Search Results (5)

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Keywords = Sida rhombifolia L.

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17 pages, 1992 KiB  
Article
Short-Term Effect of Biopolymer-Based Coatings on Surface Hardness and Color of Limestone Exposed to Tropical Outdoor Conditions
by Juan Carlos Camacho-Chab, Pedro Alberto Camacho-Chab, Juan Enrique Pereañez-Sacarías, Jorge Luis Montero-Muñoz, Augusto Ignacio Almeyda-Cen, Luis Alonso Dzul-López, María Manuela Reyes-Estebanez and Benjamín Otto Ortega-Morales
Coatings 2024, 14(2), 154; https://doi.org/10.3390/coatings14020154 - 23 Jan 2024
Cited by 2 | Viewed by 1998
Abstract
It has previously been shown that epilithic bacterial biopolymers used as coatings influenced the physical properties (surface hardness and color change) at different levels and decreased the surface disaggregation of experimental limestone when evaluated at the laboratory level. A short-term study (30 days) [...] Read more.
It has previously been shown that epilithic bacterial biopolymers used as coatings influenced the physical properties (surface hardness and color change) at different levels and decreased the surface disaggregation of experimental limestone when evaluated at the laboratory level. A short-term study (30 days) was conducted to evaluate the performance under natural conditions of limestone blocks exposed to tropical conditions of a selected bacterial biopolymer (TM1B-488, after the producing bacterium) and a previously unreported Mayan plant biopolymer known as “Escobilla”, Sida rhombifolia (Malvaceae) used in conservation procedures. Surface hardness (Leeb units) and color (L*a*b* coordinates) were measured and statistically tested for two types of limestone blocks (sound and deteriorated limestone). Both biopolymers increased surface hardness, decreased surface disaggregation, and did not alter color. Escobilla polymer is a carbohydrate-rich biopolymer characterized by tangential filtration, global chemical composition, and monosaccharide composition of hydrolyzed polymer. These results indicate that biopolymers of a heteropolysaccharide nature are constituted by some anionic charge residues that could contribute to surface stabilization and consolidation, but compatibility with traditional building materials (mortars) and longer time of exposure (a year) are necessary to fully assess their applicability in the restoration of architectural heritage. Full article
(This article belongs to the Special Issue Biological Colonization of Cultural Heritage. Emerging Trends in the Protection of Cultural Properties—Novel Control Strategies and Preventive Approaches)
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11 pages, 1939 KiB  
Article
Chemical Composition and In Vitro Antioxidant Activity of Sida rhombifolia L. Volatile Organic Compounds
by Ziyue Xu, Peizhong Gao, Dun Liu, Wenzhi Song, Lingfan Zhu and Xu Liu
Molecules 2022, 27(20), 7067; https://doi.org/10.3390/molecules27207067 - 19 Oct 2022
Cited by 21 | Viewed by 3836
Abstract
In the current study, the phytochemical constituents of volatile organic compounds (VOCs) obtained from Sida rhombifolia L. were identified by GC-FID and GC-MS analysis. A total of 73 volatile organic compounds were identified. The major components of S. rhombifolia VOCs were identified as [...] Read more.
In the current study, the phytochemical constituents of volatile organic compounds (VOCs) obtained from Sida rhombifolia L. were identified by GC-FID and GC-MS analysis. A total of 73 volatile organic compounds were identified. The major components of S. rhombifolia VOCs were identified as palmitic acid (21.56%), phytol (7.02%), 6,10,14-trimethyl-2-pentadecanone (6.30%), oleic acid (5.48%), 2-pentyl-furan (5.23%), and linoleic acid (3.21%). The VOCs are rich in fatty acids (32.50%), olefine aldehyde (9.59%), ketone (9.41%), enol (9.02%), aldehyde (8.63%), and ketene (6.41%). The antioxidant capacity of S. rhombifolia VOCs was determined by 2,2-diphenyl-1-picryl-hydrazyl-hydrate (DPPH), 2,2-azinobis-(3-ethylbenzothiazolin-6-sulfonic acid) diammonium salt (ABTS), and ferric reducing/antioxidant power (FRAP) methods with butylated hydroxytoluene (BHT) and Trolox as standard. The VOCs showed dose-dependent antioxidant activity with IC50 (50% inhibitory concentration) values of 5.48 ± 0.024 and 1.47 ± 0.012 mg/mL for DPPH and ABTS assays, respectively. FRAP antioxidant capacity was 83.10 ± 1.66 mM/g. The results show that the VOCs distilled from S. rhombifolia have a moderate antioxidant property that can be utilized as a natural botanical supplement or an antioxidant. Full article
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9 pages, 1038 KiB  
Article
Alkaloids and Phenolic Compounds from Sida rhombifolia L. (Malvaceae) and Vasorelaxant Activity of Two Indoquinoline Alkaloids
by Otemberg Souza Chaves, Yanna Carolina Ferreira Teles, Matheus Morais de Oliveira Monteiro, Leônidas Das Graças Mendes Junior, Maria De Fátima Agra, Valdir De Andrade Braga, Tânia Maria Sarmento Silva and Maria De Fátima Vanderlei de Souza
Molecules 2017, 22(1), 94; https://doi.org/10.3390/molecules22010094 - 6 Jan 2017
Cited by 48 | Viewed by 9071
Abstract
The follow-up of phytochemical and pharmacological studies of Sida rhombifolia L. (Malvaceae) aims to strengthen the chemosystematics and pharmacology of Sida genera and support the ethnopharmacological use of this species as hypotensive herb. The present work reports phytoconstituents isolated and identified from aerial [...] Read more.
The follow-up of phytochemical and pharmacological studies of Sida rhombifolia L. (Malvaceae) aims to strengthen the chemosystematics and pharmacology of Sida genera and support the ethnopharmacological use of this species as hypotensive herb. The present work reports phytoconstituents isolated and identified from aerial parts of S. rhombifolia by using chromatographic and spectroscopic methods. The study led to the isolation of scopoletin (1), scoporone (2), ethoxy-ferulate (3), kaempferol (4), kaempferol-3-O-β-d-glycosyl-6′′-α-d-rhamnose (5), quindolinone (6), 11-methoxy-quindoline (7), quindoline (8), and the cryptolepine salt (9). The alkaloids quindolinone (6) and cryptolepine salt (9) showed vasorelaxant activity in rodent isolated mesenteric arteries. Full article
(This article belongs to the Section Natural Products Chemistry)
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9 pages, 302 KiB  
Article
Secondary Metabolites from Sida rhombifolia L. (Malvaceae) and the Vasorelaxant Activity of Cryptolepinone
by Otemberg Souza Chaves, Roosevelt Albuquerque Gomes, Anna Cláudia de Andrade Tomaz, Marianne Guedes Fernandes, Leônidas Das Graças Mendes Junior, Maria De Fátima Agra, Valdir Andrade Braga and Maria De Fátima Vanderlei de Souza
Molecules 2013, 18(3), 2769-2777; https://doi.org/10.3390/molecules18032769 - 1 Mar 2013
Cited by 43 | Viewed by 9633
Abstract
The phytochemical study of Sida rhombifolia L. (Malvaceae) led to the isolation through chromatographic techniques of eleven secondary metabolites: sitosterol (1a) and stigmasterol (1b), sitosterol-3-O-b-D-glucopyranoside (2a) and stigmasterol-3-O-b-D-glucopyranoside (2b), phaeophytin A [...] Read more.
The phytochemical study of Sida rhombifolia L. (Malvaceae) led to the isolation through chromatographic techniques of eleven secondary metabolites: sitosterol (1a) and stigmasterol (1b), sitosterol-3-O-b-D-glucopyranoside (2a) and stigmasterol-3-O-b-D-glucopyranoside (2b), phaeophytin A (3), 173-ethoxypheophorbide A (4), 132-hydroxy phaeophytin B (5), 173-ethoxypheophorbide B (6), 5,7-dihydroxy-4'-methoxyflavone (7), cryptolepinone (8) and a salt of cryptolepine (9). Their structures were identified by 1H- and 13C-NMR using one- and two-dimensional techniques. In addition, the vasorelaxant activity of cryptolepinone in rat mesenteric artery rings is reported herein for the first time. Full article
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11 pages, 300 KiB  
Article
Total Phenolic Content and Antioxidant Activity of Some Malvaceae Family Species
by Adriana Maria Fernandes de Oliveira, Lilian Sousa Pinheiro, Charlane Kelly Souto Pereira, Wemerson Neves Matias, Roosevelt Albuquerque Gomes, Otemberg Souza Chaves, Maria De Fátima Vanderlei de Souza, Reinaldo Nóbrega de Almeida and Temilce Simões de Assis
Antioxidants 2012, 1(1), 33-43; https://doi.org/10.3390/antiox1010033 - 26 Oct 2012
Cited by 94 | Viewed by 14528
Abstract
The antioxidant activity of four species of the Malvaceae family (Sidastrum micranthum (A. St.-Hil.) Fryxell, Wissadula periplocifolia (L.) C. Presl, Sida rhombifolia (L.) E. H. L and Herissantia crispa L. (Brizicky)) were studied using the total phenolic content, DPPH radical scavenging [...] Read more.
The antioxidant activity of four species of the Malvaceae family (Sidastrum micranthum (A. St.-Hil.) Fryxell, Wissadula periplocifolia (L.) C. Presl, Sida rhombifolia (L.) E. H. L and Herissantia crispa L. (Brizicky)) were studied using the total phenolic content, DPPH radical scavenging activity and Trolox equivalent antioxidant capacity (TEAC) assays. The antioxidant activity of the crude extract, phases and two isolated flavonoids, kaempferol 3,7-di-O-α-l-rhamnopyranoside (lespedin) and kaempferol 3-O-β-d-(6''-E-p-coumaroil) glucopyranoside (tiliroside) was determined. The results showed that there is a strong correlation between total polyphenol contents and antioxidant activity of the crude extract of Sidastrum micranthum and Wissadula periplocifolia; however, this was not observed between Sida rhombifolia and Herissantia crispa. The ethyl acetate (EaF) phase showed the best antioxidant effect in the total phenolics, DPPH and TEAC assays, followed by the chloroform (CfF) phase, in most species tested. Lespedin, isolated from the EaF phase of W. periplocifolia and H. crispa may not be responsible for the antioxidant activity due to its low antioxidant activity (IC50: DPPH: 1,019.92 ± 68.99 mg/mL; TEAC: 52.70 ± 0.47 mg/mL); whereas tiliroside, isolated from W. periplocifolia, H. crispa and S. micrantum presented a low IC50 value (1.63 ± 0.86 mg/mL) compared to ascorbic acid in the TEAC assay. Full article
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