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Psidium guajava

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https://www.readbyqxmd.com/read/29904391/midday-depression-vs-midday-peak-in-diurnal-light-interception-contrasting-patterns-at-crown-and-leaf-scales-in-a-tropical-evergreen-tree
#1
Agustina Ventre-Lespiaucq, Nicola S Flanagan, Nhora H Ospina-Calderón, Juan A Delgado, Adrián Escudero
Crown architecture usually is heterogeneous as a result of foraging in spatially and temporally heterogeneous light environments. Ecologists are only beginning to identify the importance of temporal heterogeneity for light acquisition in plants, especially at the diurnal scale. Crown architectural heterogeneity often leads to a diurnal variation in light interception. However, maximizing light interception during midday may not be an optimal strategy in environments with excess light. Instead, long-lived plants are expected to show crown architectures and leaf positions that meet the contrasting needs of light interception and avoidance of excess light on a diurnal basis...
2018: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29869310/isolation-formulation-and-efficacy-enhancement-of-morin-emulsified-carriers-against-lung-toxicity-in-rats
#2
Alaadin E El-Haddad, Nermin M Sheta, Sylvia A Boshra
The present study demonstrates a preparative medium-pressure liquid chromatography (MPLC) method for isolation of Morin besides evaluating its efficacy in comparison with its self-nanoemulsifying drug delivery (SNEDD) and nanoemulsion (NE) systems against in-vivo HgCl2 -induced lung toxicity in rats. Morin was isolated from hydroalcoholic (70%) extract of Psidium guajava leaves by MPLC. The purity (> 90%) was done using HPLC. Screening of Morin solubility was studied to identify the components of each system...
June 4, 2018: AAPS PharmSciTech
https://www.readbyqxmd.com/read/29790584/effects-of-psidium-guajava-leaf-extract-on-secretion-systems-of-gram-negative-enteropathogenic-bacteria
#3
Noboru Nakasone, Yasunori Ogura, Naomi Higa, Claudia Toma, Yukiko Koizumi, Giichi Takaesu, Toshihiko Suzuki, Tetsu Yamashiro
We screened a total of 672 plant-tissue extracts to search for phytochemicals that inhibit the function of the type III secretion system (T3SS) of enteropathogenic Escherichia coli (EPEC) and enterohemorrhagic E. coli (EHEC). Among candidates examined, we found that an extract from the leaves of Psidium guajava (guava) inhibited the secretion of the EspB protein from EPEC and EHEC without affecting bacterial growth. The guava extract (GE) also inhibited EPEC and EHEC from adhering to and injecting EspB protein into HEp-2 cells...
May 23, 2018: Microbiology and Immunology
https://www.readbyqxmd.com/read/29765815/in-vitro-investigation-of-antimicrobial-activities-of-ethnomedicinal-plants-against-dental-caries-pathogens
#4
Mamta Besra, Vipin Kumar
The study aimed to evaluate the antimicrobial activity of medicinal plant extracts against the bacterial pathogens prominent in dental caries. A total of 20 plant species (herbs, shrubs and trees) belonging to 18 genera and 15 families were documented for dental caries. Antimicrobial activity of solvent extracts and essential oil from plants were determined by zone of inhibition on the growth of Streptococcus mutans (MTCC 497) and Lactobacillus acidophilus (MTCC 10307) using the agar well diffusion method. The results of in vitro antimicrobial assay prove that methanol is more successful in the extraction of phytochemicals from plant samples than aqueous solvent, as methanol extracts show higher antimicrobial activity than aqueous extracts against both the test pathogens...
May 2018: 3 Biotech
https://www.readbyqxmd.com/read/29756280/determination-of-phenolic-compounds-and-antioxidant-activities-from-peel-flesh-seed-of-guava-psidium-guajava-l
#5
Xuan Liu, Xu Yan, Jinfeng Bi, Jianing Liu, Mo Zhou, Xinye Wu, Qinqin Chen
White-flesh guava is widely planted in tropical or subtropical areas of Southeast Asia. Despite of folk statements on specific function, few researches are focused on the description of its plant secondary metabolites. In the present work, contents of total phenolics and flavonoids as well as antioxidant activity from different parts (peel, flesh and seed) were determined. The constituents of ethanol extracts were characterized by HPLC-QTOF-MS. A total of 69 phenolic compounds as well as 9 polar compounds were detected, with flavonoids, hydrolyzable tannins, phenolic acid derivatives and benzophenones of the four predominant phenolic compounds...
May 13, 2018: Electrophoresis
https://www.readbyqxmd.com/read/29751075/analysis-by-uplc-ms-qtof-and-antifungal-activity-of-guava-psidium-guajava-l
#6
Camila Fonseca Bezerra, Janaína Esmeraldo Rocha, Maria Karollyna do Nascimento Silva, Thiago Sampaio de Freitas, Amanda Karine de Sousa, Antônia Thassya Lucas Dos Santos, Rafael Pereira da Cruz, Maciel Horácio Ferreira, Josefa Carolaine Pereira da Silva, Antonio Judson Targino Machado, Joara Nályda Pereira Carneiro, Débora Lima Sales, Henrique Douglas Melo Coutinho, Paulo Riceli Vasconcelos Ribeiro, Edy Sousa de Brito, Maria Flaviana Bezerra Morais-Braga
Psidium guajava L. is a plant widely used for food and in folk medicine all over the world. Studies have shown that guava leaves have antifungal properties. In this study, Flavonoid and Tannic fractions were tested to investigate their chemical composition and antifungal potential in vitro.21 compounds in the two fractions, presenting a higher content of phenolic compounds. The antifungal assays were performed against Candida albicans, Candida tropicalis and Candida krusei by microdilution to determine the IC50 and the cell viability curve...
May 8, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29710658/guava-leaf-inhibits-hepatic-gluconeogenesis-and-increases-glycogen-synthesis-via-ampk-acc-signaling-pathways-in-streptozotocin-induced-diabetic-rats
#7
Ramachandran Vinayagam, Muthukumaran Jayachandran, Stephen Sum Man Chung, Baojun Xu
Psidium guajava (PG) is a short shrub or tree cultivated in tropical and subtropical regions around the world. The leaf extract of PG (guava leaf) has been used historically to cure many ailments. However, mechanisms of action of guava leaf in treating diabetes are not fully understood. Effects and underlying mechanisms of guava leaf on gluconeogenesis and glycogenesis in hepatocytes, insulin signaling proteins, liver function markers, and lipid profile in streptozotocin (STZ) injected diabetic Wistar rats were investigated within the current study...
July 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29709646/cytotoxicity-of-18-cameroonian-medicinal-plants-against-drug-sensitive-and-multi-factorial-drug-resistant-cancer-cells
#8
Armelle T Mbaveng, Hermione T Manekeng, Gaelle S Nguenang, Joachim K Dzotam, Victor Kuete, Thomas Efferth
ETHNOPHARMACOLOGICAL RELEVANCE: Recommendations have been made stating that ethnopharmacological usages such as immune and skin disorders, inflammatory, infectious, parasitic and viral diseases should be taken into account if selecting plants for anticancer screening, since these reflect disease states bearing relevance to cancer or cancer-like symptoms. Cameroonian medicinal plants investigated in this work are traditionally used to treat cancer or ailments with relevance to cancer or cancer-like symptoms...
April 27, 2018: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29688623/in-vitro-and-in-vivo-inhibition-of-intestinal-glucose-transport-by-guava-psidium-guajava-extracts
#9
Ulrike Müller, Flora Stübl, Bettina Schwarzinger, Georg Sandner, Marcus Iken, Markus Himmelsbach, Clemens Schwarzinger, Nicole Ollinger, Verena Stadlbauer, Otmar Höglinger, Tobias Kühne, Peter Lanzerstorfer, Julian Weghuber
SCOPE: Known pharmacological activities of guava (Psidium guajava) include modulation of blood glucose levels. However, mechanistic details remain unclear in many cases. METHODS AND RESULTS: This study investigated the effects of different guava leaf and fruit extracts on intestinal glucose transport in vitro and on postprandial glucose levels in vivo. Substantial dose- and time-dependent glucose transport inhibition (up to 80%) was observed for both guava fruit and leaf extracts, at conceivable physiological concentrations in Caco-2 cells...
June 2018: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/29687303/effects-of-psidium-guajava-linn-leaf-extract-in-japanese-subjects-with-knee-pain-a-randomized-double-blind-placebo-controlled-parallel-pilot-study
#10
Shingo Kakuo, Takashi Fushimi, Keiko Kawasaki, Junji Nakamura, Noriyasu Ota
The extract of Psidium guajava Linn. (guava) leaf was recently revealed to suppress the advance of osteoarthritis (OA) in rat anterior cruciate ligament-transection models. To investigate the efficacy of guava leaf extract in improving knee pain, which is a common symptom of OA, we conducted a double-blind parallel pilot clinical study in Japanese subjects with knee pain. The subjects, who had no medical history of knee treatment, were randomly assigned to two groups with similar total Japanese Knee Osteoarthritis Measure (JKOM) scores...
April 23, 2018: Aging Clinical and Experimental Research
https://www.readbyqxmd.com/read/29668952/terminalia-larval-host-fruit-reduces-the-response-of-bactrocera-dorsalis-diptera-tephritidae-adults-to-the-male-lure-methyl-eugenol
#11
N C Manoukis, D H Cha, R M Collignon, T E Shelly
Methyl eugenol (ME) is a powerful semiochemical attractant to males of the oriental fruit fly, Bactrocera dorsalis (Hendel) (Diptera: Tephritidae), and is the keystone of detection, control, and eradication programs against this polyphagous and highly invasive tephritid pest. Despite its status as a model lure against B. dorsalis, variation among individuals in their attraction is known, independent of the generally increasing attraction with age and decreases with previous exposure. Here we report that adult male B...
April 12, 2018: Journal of Economic Entomology
https://www.readbyqxmd.com/read/29600652/-study-on-antioxidant-activity-of-flavonoids-from-leaves-of-psidium-guajava
#12
Yu-Jing Zhao, Jian-Kuan Li, Xin Zhang, Jian-Ping Gao
The present study is to study the chemical constituents from ethanol extract of Psidium guajava leaves. The constituents were separated and purified by silica gel column chromaiographios over, macroporous resin D-101, Sephadex LH-20, and ODS. Six flavonoids compounds were isolated and identified as quercetin(1), quercetin-3- O - α -D-arabinopyranoside(2), quercetin-3- O - α -D-ribopyranoside(3), quercetin-3- O - β -D-galactopyranoside(4), quercetin-3- O - α -D-glucopyranoside(5), and quercetin-3- O - α- D-xylpyranoside(6)...
February 2018: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29576705/antibacterial-activity-of-azadirachta-indica-pongamia-pinnata-psidium-guajava-and-mangifera-indica-and-their-mechanism-of-action-against-streptococcus-mutans
#13
Dikonketso Cathrine Bodiba, Preety Prasad, Ajay Srivastava, Brigdet Crampton, Namrita Sharan Lall
Background: Curative plants have reportedly been used to make chewing sticks/toothbrushes intended for the treatment of oral diseases. Objective: The in vitro antibacterial activities of Azadirachta indica , Pongamia pinnata , Psidium guajava , and Mangifera indica were evaluated against Streptococcus mutans , along with the cytotoxicity and antioxidant and synergistic potentials. The effect of M. indica on the expression of crucial virulence genes spaP and gtfB of S...
January 2018: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29576694/hypolipidemic-effect-of-psidium-guajava-leaf-extract-against-hepatotoxicity-in-rats
#14
K Vijayakumar, R L Rengarajan, R Radhakrishnan, A Vijaya Anand
Background: Plant-based natural extracts cure several diseases in human. However, the extract of Psidium guajava leaf is not yet evaluated on changes of lipid profile in hepatic disease affected rats. Objective: The present study was aimed to evaluate the mitigation effect of the ethanolic extract of P. guajava leaf and its isolated quercetin fraction on hepatotoxic rats. Materials and Methods: Carbon tetrachloride (CCl4 ) was injected to rats for hepatic disease induction and silymarin drug was used as positive control to compare plant ethanolic extract...
January 2018: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29548852/antiparasitic-effect-of-the-psidium-guajava-l-guava-and-psidium-brownianum-mart-ex-dc-ara%C3%A3-%C3%A3-de-veado-extracts
#15
Antonio J T Machado, Antonia T L Santos, Gioconda M A B Martins, Rafael P Cruz, Maria do S Costa, Fábia F Campina, Maria A Freitas, Camila F Bezerra, Antonio L A B Leal, Joara N P Carneiro, Cathia Coronel, Miriam Rolón, Celeste V Gómez, Henrique D M Coutinho, Maria F B Morais-Braga
In the search for new therapeutic agents against neglected diseases, both aqueous and hydroethanolic extracts from Psidium guajava L. and P. brownianum Mart ex DC leaves were investigated regarding their antiparasitic effect and cytotoxic potential. The extracts were tested at three concentrations (250, 500 and 1000 μg/mL) against Trypanosoma cruzi epimastigote forms (Chagas, 1909), Leishmania braziliensis (Vianna, 1911) and L. infantum promastigotes forms (Nicolle, 1908), as well as against fibroblasts...
March 13, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29525084/characterization-antioxidant-and-antimicrobial-activities-of-green-synthesized-silver-nanoparticles-from-psidium-guajava-l-leaf-aqueous-extracts
#16
Lu Wang, Yanan Wu, Jia Xie, Sheng Wu, Zhenqiang Wu
The green synthesis of nanoparticles has become increasingly promising due to their potential applications in nanomedicine and materials science. In this study, silver nanoparticles (P-AgNPs) were synthesized from aqueous extracts of P. guajava L. leaf. The synthesized silver nanoparticles were confirmed by UV-vis spectrophotometry at 438 nm. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and zetasizer analyses showed that the average sizes of the P-AgNPs were 20-35 nm, 25 nm, and 25-35 nm, respectively...
May 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29500752/attractiveness-of-host-plant-volatile-extracts-to-the-asian-citrus-psyllid-diaphorina-citri-is-reduced-by-terpenoids-from-the-non-host-cashew
#17
Marilene Fancelli, Miguel Borges, Raul A Laumann, John A Pickett, Michael A Birkett, Maria C Blassioli-Moraes
Diaphorina citri is a vector of the bacterial causative agent of Huanglongbing (HLB = Citrus greening), a severe disease affecting citrus crops. As there is no known control for HLB, manipulating insect behaviour through deployment of semiochemicals offers a promising opportunity for protecting citrus crops. The behavioural responses of D. citri to plant volatiles, and the identity of these plant volatiles were investigated. Volatiles were collected from host plants Murraya paniculata, Citrus sinensis, C...
April 2018: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/29495514/quantification-of-phenolic-compounds-and-in-vitro-radical-scavenging-abilities-with-leaf-extracts-from-two-varieties-of-psidium-guajava-l
#18
Julio César Camarena-Tello, Héctor Eduardo Martínez-Flores, Ma Guadalupe Garnica-Romo, José Saúl Padilla-Ramírez, Alfredo Saavedra-Molina, Osvaldo Alvarez-Cortes, María Carmen Bartolomé-Camacho, José Octavio Rodiles-López
Guava leaf ( Psidium guajava L.) extracts are used in both traditional medicine and the pharmaceutical industry. The antioxidant compounds in P. guajava leaves can have positive effects including anti-inflammatory, anti-hyperglycemic, hepatoprotective, analgesic, anti-cancer effects, as well as protecting against cardiovascular diseases. In the present study, phenolic compounds and in vitro antioxidant capacity were measured in extracts obtained with polar and non-polar solvents from leaves of two varieties of guava, Calvillo Siglo XXI and Hidrozac...
February 27, 2018: Antioxidants (Basel, Switzerland)
https://www.readbyqxmd.com/read/29477369/medicinal-plants-used-by-the-people-of-nsukka-local-government-area-south-eastern-nigeria-for-the-treatment-of-malaria-an-ethnobotanical-survey
#19
Uchenna E Odoh, Philip F Uzor, Chidimma L Eze, Theophine C Akunne, Chukwuma M Onyegbulam, Patience O Osadebe
ETHNOBOTANICAL RELEVANCE: Malaria is a serious public health problem especially in sub-Saharan African countries such as Nigeria. The causative parasite is increasingly developing resistance to the existing drugs. There is urgent need for alternative and affordable therapy from medicinal plants which have been used by the indigenous people for many years. AIM OF STUDY: This study was conducted to document the medicinal plant species traditionally used by the people of Nsukka Local Government Area in south-eastern Nigeria for the treatment of malaria...
May 23, 2018: Journal of Ethnopharmacology
https://www.readbyqxmd.com/read/29455277/guava-psidium-guajava-l-cv-red-suprema-crude-extract-protect-human-dermal-fibroblasts-against-cytotoxic-damage-mediated-by-oxidative-stress
#20
José M Alvarez-Suarez, Francesca Giampieri, Massimiliano Gasparrini, Luca Mazzoni, Tamara Y Forbes-Hernández, Sadia Afrin, Maurizio Battino
We analyzed guava fruits (Psidium guajava L. cv. Red Suprema) from Cuba to determine their chemical composition, total antioxidant capacity, as well as their protective effect against oxidative damage using an in vitro model of human dermal fibroblasts. The guava fruit is a natural source of bioactive compounds, such as polyphenols, vitamin C, folates and beta carotenes with proven health benefits. Human dermal fibroblasts were pre-incubated with different concentrations of guava crude extract and then subjected to oxidative stress using the AAPH stressor...
March 2018: Plant Foods for Human Nutrition
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