Highly Oxygenated Flavonoids from the Leaves of Nicotiana plumbaginifolia (Solanaceae)

Nicotiana plumbaginifolia Viv. is an annual herb of the family Solanaceae, which grows abundantly in the weedy lands of Bangladesh. This plant possesses analgesic, antibacterial, anti-anxiety and hepatoprotective properties, and produces various phenolic compounds including flavonoids. The present study afforded determination of total phenolic and flavonoid contents, and for the first time, the isolation and characterization of highly oxygenated flavonoids, e.g., 3,3',5,6,7,8-hexamethoxy-4',5'-methylenedioxyflavone (1), 3,3',4',5',5,6,7,8-octamethoxyflavone (2, exoticin), 6,7,4',5'-dimethylenedioxy-3,5,3'-trimethoxyflavone (3) and (3,3',4',5,5',8-hexamethoxy-6,7-methylenedioxyflavone (4) from the leaves of N. plumbaginifolia. All these flavonoids are rather rare natural products, and only found in a few genera, e.g., Polygonum and Murraya. The structures of the isolated flavonoids were elucidated by comprehensive spectroscopic analyses, e.g., UV, 1H, 13C NMR, DEPT, HSQC, HMBC and MS

A mini-review on oxysporone

Oxysporone, possessing a 4H-furo(2,3-b)pyran-2(3H)-one structure, is a fungal metabolite, first isolated from Fusarium oxysporum. Later, this compound was also reported from the fungal genera, Diplodia, Pestalotia and Pestalotiopsis. Oxysporone was patented as an antibiotic for the treatment of dysentery, and its phytotoxic property has been well-established. Interesting biological and chemical properties of oxysporone make this compound attractive for its potential biotechnological applications in agriculture, especially as a new agrochemical with a lower environmental impact. However, it requires further extensive bioactivity screening looking at beyond its established phytotoxicity and preliminary antifungal property. It has a simple chemical structure (C7H8O4), and the hydroxyl group at C-4 provides options for synthesising numerous analogues by simply incorporating various functionalities at C-4, whilst keeping the main skeleton intact. This mini-review provides a critical overview on the occurrence, production, synthesis, structure elucidation and bioactivities of oxysporone

Sonneratinone: A New Antimicrobial Benzofuranone Derivative from the Endophytic Fungus Aspergillus niger Isolated from the Mangrove Plant Sonneratia apetala Buch.-Ham

A new antimicrobial benzofuranone derivative, named, sonneratinone (1), was isolated from the endophytic fungus Aspergillus niger, obtained from the leaves of Sonneratia apetala, a mangrove plant from the Sundarbans. Whilst the fungal strain was identified by macroscopic, microscopic and molecular techniques, the structure of the new compound was elucidated by spectroscopic means, e.g., 1D and 2D NMR, and HRESIMS. Sonneratinone (1) showed considerable antimicrobial activity against Micrococcus luteus, Staphylococcus aureus and Candida albicans in the resazurin 96-well microtitre plate antimicrobial assay

Socio-demographic and injury-related factors contributing to activity limitations and participation restrictions in people with spinal cord injury in Bangladesh

Study design: Cross-sectional study. Objectives: To identify socio-demographic and injury-related factors that contribute to activity limitations and participation restrictions in people with spinal cord injury (SCI) in Bangladesh. Setting: Centre for the Rehabilitation of the Paralysed (CRP), Savar, Dhaka, Bangladesh. Methods: This study involved 120 (83% men) participants with SCI; their median (interquartile range) age and injury duration were 34 (25–43) years and 5 (2–10) years, respectively. Data were collected from the follow-up records kept by the Community Based Rehabilitation (CBR) unit of CRP and a subsequent home visit that included interview-administered questions, questionnaires, and a neurological examination. The dependent variables were activity limitations and participation restrictions, assessed with the World Health Organization Disability Assessment Schedule 2.0 (WHODAS 2.0, scored 0–100; a high score indicates greater activity limitations and participation restrictions). Independent variables included socio-demographic factors (i.e., age, sex, marital status, educational level, monthly household income, employment status, and place of residence) and injury-related factors (i.e., injury duration, cause of injury, injury severity, and type of paralysis). Multivariable linear regression analyses were performed to identify the factors that independently contributed to activity limitations and participation restrictions. Results: Three significant independent variables explained 20.7% of the variance in activity limitations and participation restrictions (WHODAS 2.0 score), in which tetraplegia was the strongest significant contributing factor, followed by rural residence and complete injury. Conclusions: This study would indicate that tetraplegia, complete injury, and residing in a rural area are the major contributions in limiting the activity and participation following SCI in Bangladesh