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Psidium guajava

Elixabet Díaz-de-Cerio, Federica Pasini, Vito Verardo, Alberto Fernández-Gutiérrez, Antonio Segura-Carretero, Maria Fiorenza Caboni
Due to the importance of the proanthocyanidins (PAs) bioactivity and its relationship with the PAs degree of polymerization (DP), an experimental design was carried out to establish the best extraction conditions in order to evaluate the proanthocyanidins content and their degree of polymerization in Psidium guajava leaves at different oxidation state. Optimal conditions achieved by response surface methodology were 50% acetone/water (v/v), 48°C, 30min, and 0% acetic acid (v/v). The highest DP has been found in the low oxidized state (DP 13 plus the polymers)...
October 13, 2016: Journal of Pharmaceutical and Biomedical Analysis
Devendra Kumar, Neerja Trivedi, Rakesh K Dixit
AIMS/BACKGROUND: This study was to investigated the synergistic effect of polyherbal formulations (PHF) of Allium sativum L., Eugenia jambolana Lam., Momordica charantia L., Ocimum sanctum Linn., and Psidium guajava L. in the inhibition/induction of hepatic and intestinal cytochrome P450 (CYPs) and Phase-II conjugated drug metabolizing enzymes (DMEs). Consumption of these herbal remedy has been extensively documented for diabetes treatment in Ayurveda. METHODOLOGY: PHF of these five herbs was prepared, and different doses were orally administered to Sprague-Dawley rats of different groups except control group...
September 2016: Journal of Intercultural Ethnopharmacology
Alessandro Venditti, Stanley E Ukwueze
Bidimensional NMR analysis may be a useful tool to resolve the structure of chemical compounds also in mixture. This letter would demonstrate how these techniques could be applied e.g. to the reported case on identification of benzophenone glycoside from Psidium guajava. A tentative structure for the secondary component, not yet described, was possibly proposed on the basis of observation and critic review of available 1D and 2D NMR spectra.
October 14, 2016: Natural Product Research
Byalakere Rudraiah Chandra Shekar, Ramesh Nagarajappa, Rupal Singh, S Suma, Rupesh Thakur
BACKGROUND: The rise in disease incidence, increased resistance of pathogenic bacteria to currently used antibiotics and chemotherapeutics, opportunistic infections in immunocompromised individuals, and financial considerations in developing countries necessitates alternate preventive and treatment strategies for oral diseases. OBJECTIVE: The objective of the study is to assess the antimicrobial efficacy of triple and quadruple combinations of Acacia nilotica (AN), Murraya koenigii (Linn...
July 2016: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
Narayanan Gobi, Chinnu Ramya, Baskaralingam Vaseeharan, Balasubramanian Malaikozhundan, Sekar Vijayakumar, Kadarkarai Murugan, Giovanni Benelli
In this research, we focused on the efficacy of aqueous and ethanol leaf extracts of Psidium guajava L. (guava) based experimental diets on the growth, immune, antioxidant and disease resistance of tilapia, Oreochromis mossambicus following challenge with Aeromonas hydrophila. The experimental diets were prepared by mixing powdered (1, 5 and 10 mg/g) aqueous and ethanol extract of guava leaf with commercial diet. The growth (FW, FCR and SGR), non-specific cellular immune (myeloperoxidase activity, reactive oxygen activity and reactive nitrogen activity) humoral immune (complement activity, antiprotease, alkaline phosphatase activity and lysozyme activity) and antioxidant enzyme responses (SOD, GPX, and CAT) were examined after 30 days of post-feeding...
October 1, 2016: Fish & Shellfish Immunology
E G Deus, W A C Godoy, M S M Sousa, G N Lopes, C R Jesus-Barros, J G Silva, R Adaime
Field infestation and spatial distribution of introduced Bactrocera carambolae Drew and Hancock and native species of Anastrepha in common guavas [Psidium guajava (L.)] were investigated in the eastern Amazon. Fruit sampling was carried out in the municipalities of Calçoene and Oiapoque in the state of Amapá, Brazil. The frequency distribution of larvae in fruit was fitted to the negative binomial distribution. Anastrepha striata was more abundant in both sampled areas in comparison to Anastrepha fraterculus (Wiedemann) and B...
2016: Journal of Insect Science
Henrique A Souza, Serge-Étienne Parent, Danilo E Rozane, Daniel A Amorim, Viviane C Modesto, William Natale, Leon E Parent
The Brazilian guava processing industry generates 5.5 M Mg guava waste year(-1) that could be recycled sustainably in guava agro-ecosystems as slow-release fertilizer. Our objectives were to elaborate nutrient budgets and to diagnose soil, foliar, and fruit nutrient balances in guava orchards fertilized with guava waste. We hypothesized that (1) guava waste are balanced fertilizer sources that can sustain crop yield and soil nutrient stocks, and (2) guava agroecosystems remain productive within narrow ranges of nutrient balances...
2016: Frontiers in Plant Science
Rafael M Tavares, João P A R Cunha, Thales C Alves, Mariana R Bueno, Sérgio M Silva, César H S Zandonadi
BACKGROUND: Due to the difficulty in reaching targets during pesticide applications on guava trees, it is important to evaluate new technologies that may improve pest management. In electrostatic spraying, an electric force is added to the droplets to control their movements such that they are efficiently directed to the target. The present study evaluated the performance of electrostatic and non-electrostatic spraying in the control of the guava psyllid, the deposition of the spray mixture on the leaves, and the losses to the soil...
September 8, 2016: Pest Management Science
Olufunke B Shittu, Olusola L Ajayi, Samuel O Bankole, Temitope Os Popoola
BACKGROUND: Cholera, a severe acute watery diarrhea caused by Vibrio cholerae is endemic in Nigeria with most cases occurring in the rural areas. In South West Nigeria, some individuals resort to alternative treatments such as Ogi-tutu, Psidium guajava and Vernonia amygdalina during infections. The effectiveness of these alternatives in the prevention and treatment of V. cholerae infection requires experimental investigation. OBJECTIVE: This study was designed to investigate the ameliorative effects of Ogi-tutu, Vernonia amygdalina and Psidium guajava on intestinal histopathology of experimental mice infected with V...
June 2016: African Health Sciences
Ricardo K Nakazato, Mirian C S Rinaldi, Marisa Domingos
The foliar accumulation and enrichment factor for 36 elements were studied in Psidium guajava 'Paluma' (fruit tropical tree) and Tibouchina pulchra Cogn. (native tree of the Atlantic rainforest) plants exposed around the city of Cubatão/Brazil, to propose a biomonitoring species in the Atlantic rainforest. The field experiments were conducted in six sites from November/2009 to April/2011. Parallel exposures of plants to filtered air in open-top chambers were performed to determine the background leaf concentrations of all elements...
August 31, 2016: Ecotoxicology and Environmental Safety
Xu-Jie Qin, Huan Yan, Wei Ni, Mu-Yuan Yu, Afsar Khan, Hui Liu, Hong-Xia Zhang, Li He, Xiao-Jiang Hao, Ying-Tong Di, Hai-Yang Liu
Three new meroterpenoids, guajavadials A-C (1-3), were isolated from Psidium guajava cultivated in temperate zone. Their structures were established by extensive spectroscopic evidence and electronic circular dichroism (ECD) calculations. Guajavadial A (1) represents a novel skeleton of the 3,5-diformylbenzyl phloroglucinol-coupled monoterpenoid, while guajavadials B (2) and C (3) are new adducts of the 3,5-diformylbenzyl phloroglucinol and a sesquiterpene with different coupling models. The plausible biosynthetic pathways as well as antimicrobial and cytotoxic activities of these meroterpenoids are also discussed...
2016: Scientific Reports
John Paul Cunningham, Mikael A Carlsson, Tommaso F Villa, Teun Dekker, Anthony R Clarke
Frugivorous tephritid fruit flies have lineages with high levels of host generalism. These insects use olfaction to locate fruits, but how they are able to recognize the odors of so many different host species is poorly understood. We used a series of behavioral experiments to investigate the role of fruit ripening volatiles as host cues in the Queensland fruit fly, Bactrocera tryoni (Froggatt), a polyphagous pest in Australia. Odors of mature guava (Psidium guajava) attracted female and male flies more strongly than three other ripening stages and guava pulp...
September 1, 2016: Journal of Chemical Ecology
Dong-Ung Lee, Kwon Yeon Weon, Da-Yeong Nam, Joo Hyun Nam, Woo Kyung Kim
Ultraviolet (UV) irradiation is a major environmental factor affecting photoaging, which is characterized by skin wrinkle formation and hyperpigmentation. Although many factors are involved in the photoaging process, UV irradiation is thought to play a major role in melanogenesis. Tyrosinase is the key enzyme in melanin synthesis; therefore, many whitening agents target tyrosinase through various mechanisms, such as direct interference of tyrosinase catalytic activity or inhibition of tyrosinase mRNA expression...
August 4, 2016: Experimental Dermatology
Thitiporn Thaptimthong, Thitima Kasemsuk, Nathawut Sibmooh, Supeenun Unchern
BACKGROUND: The purpose of this study is to investigate cardiovascular benefits of juices obtained from two commonly consumed fruits in Thailand, Pachyrhizus erosus, L. (yam bean) and Psidium guajava, L. (guava), by examining their acute cardiovascular effects in healthy volunteers. Possible involvements of the dietary nitrate on their effects were investigated as well. METHOD: Thirty healthy volunteers were randomly divided into three groups of 10 subjects per group and each group was allocated to drink 500 ml of freshly prepared yam bean root juice, guava fruit juice, or water...
2016: BMC Complementary and Alternative Medicine
Márcia Cavalcante Conceição, Tatiana Nunes Fernandes, Jaime Vilela de Resende
Freeze-dried guava pulp powders, formulated with the addition of sucrose (0-20 g/100 g pulp) and pectin (0-1.0 g/100 g pulp), were obtained, and their stability was evaluated with respect to the water adsorption isotherms, thermal analysis and microstructure. The GAB (Guggenheim-Anderson-de Boer), Peleg and BET (Brunauer-Emmett-Teller) models were used to evaluate the water adsorption. The microstructure was examined using optical microscopy with polarized light and scanning electron microscopy (SEM). The GAB and BET parameters showed that the moisture content of the monolayer (Xm) increases with increasing pectin concentration in the adsorption isotherms...
June 2016: Journal of Food Science and Technology
Sowmya Soman, Chellam Rajamanickam, Arun A Rauf, Indira Madambath
CONTEXT: Antiglycative potential of Psidium guajava L. (Myrtaceae) leaves has been established. However, the molecular basis of its antiglycative potential remains unknown. OBJECTIVE: The ethyl acetate fraction of P. guajava leaves (PGEt) was evaluated to determine the cardioprotective effect and its mechanism of action compared to quercetin. MATERIALS AND METHODS: After the induction of diabetes by streptozotocin (55 mg/kg body weight), PGEt and quercetin (50 mg/kg body weight) was administered for 60 days...
July 14, 2016: Pharmaceutical Biology
Chandrahas Vishwasrao, Laxmi Ananthanarayan
Psidium guajava L. var. 'Lalit' is a perishable fruit with delicate skin which is prone to damage. The objective of this study was to determine the effect of edible coating made up of hydroxypropyl methyl cellulose and palm oil on ripening of guava. Coating solution was applied over fruits and coated fruits were stored at 24 ± 1 °C and 65 ± 5%RH. Changes in fruit colour, texture softening, respiration rate, weight loss, ascorbic acid content, soluble solids, titrable acidity, chlorophyll content, total reducing sugars, total phenolic content were studied during post-harvest ripening...
April 2016: Journal of Food Science and Technology
T Kondo, P J Gullan, L G Cook
The eriococcid genus Capulinia Signoret currently comprises four Neotropical species (the type species C. sallei Signoret, C. crateraformis Hempel, C. jaboticabae Ihering and an undescribed species recognised in the literature) and one species from New Zealand (C. orbiculata Hoy). All species feed on plants in the family Myrtaceae and the undescribed species is a pest of guava, Psidium guajava, in Venezuela and Colombia. Here we describe the pest species based on the adult female and first-instar nymph and name it Capulinia linarosae Kondo & Gullan sp...
2016: Zootaxa
M P Culik, J A Ventura, D Dos S Martins
Greenidea psidii is an invasive insect from Asia that feeds on a diverse variety of agriculturally and environmentally important plant species. As an essential component of research necessary for development of a better understanding of biodiversity and its conservation, this study documents a major recent expansion in range of G. psidii in the Neotropics to the region of the tropical restinga ecosystem of Brazil, where it was found infesting guava (Psidium guajava) and jabuticaba (Plinia cauliflora). A summary of information on the geographic distribution, host plants, identification, and potential natural enemies of G...
2016: SpringerPlus
Seo-Young Kim, Eun-A Kim, Young-Sun Kim, Seok-Kyu Yu, Changyong Choi, Jung-Suk Lee, Yong-Tae Kim, Jae-Woon Nah, You-Jin Jeon
The aim of this study was to analyze antioxidant properties of a polysaccharide isolated from Psidium guajava leaves (PS-PGL) in vitro including its radical scavenging activities and protective effects against damage to cells as well as in vivo in zebrafish. The water extract of P. guajava leaves (WE-PGL) and PS-PGL showed strong radical scavenging effects in terms of 2,2-diphenyl-1-picrylhydrazyl (DPPH), hydroxyl, and alkyl radical. Compared to WE-PGL, PS-PGL enhanced all scavenging activities and in particular strongly scavenged the hydroxyl radical (50% inhibitory concentration [IC50], 0...
October 2016: International Journal of Biological Macromolecules
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