Enhancing the enzymatic browning inhibition capacity of Moringa oleifera seed extract via the Maillard reaction

The antioxidant and anti-browning activity of heated plant extracts have been attributed to the formation of Maillard reaction products (MRPs) via the Maillard reaction (MR). The inhibitory effect of heated Moringa oleifera (MO) seed extract on banana polyphenol oxidase (PPO) was investigated. The Plain MO seed extracts and those with added glucose and glycine (1.5 mM each) were heated at 100°C for 15, 30, 60 and 120 min. The pH and brown colour development decreased and increased significantly (P <0.05) with increased reaction time, respectively, with heated moringa glucose-glycine HMGGL for 120 min exhibiting the highest pH reduction (2.58) and darkest extracts at an L* value of 8.11. This phenomenon is associated with progression of the MR. With reference to enzymatic browning, heated MO seed extracts exhibited stronger inhibitory effect against banana PPO activity in vivo and in vitro than the unheated counterpart. Evident to this are the higher inhibition percentages and lower ΔE values. Among model systems, the highest in vitro browning inhibition was exhibited mostly by longer heating times of 60 and 120 min. Model system HMGGL 120 min proved to be superior at 96% inhibition, which was comparable to known synthetic commercial antioxidants such as ascorbic acid (AA) at 99%, as well as ethylenediaminetetraacetic acid (EDTA) and citric acid (CA), both at 100% inhibition. In vivo enzymatic browning inhibition followed a similar trend, where the brown pigment (melanin) intensified as shown by an increase in ΔE as the storage time increased from 0.5 to 24 h. The model system UMGGL exhibited highest inhibition of brown melanin (p <0.05). Although it was the best amongst other model systems, it was surpassed by synthetic antioxidants AA, EDTA and CA, which were ranked amongst the top three in inhibiting brown pigment formation in vivo. To further illustrate the effect of MR augmented MO seed extracts on enzyme activity inhibition, UMGGL 60 and 120 at 5 and 24 h storage surpassed the inhibitory effect of AA. At the said storage times, AA lost its inhibitory potential against pigment formation. This was due to oxidation of AA to form dehydroascorbic acid, which lacks inhibitory potential. This study proved that heating MO plant extracts increases their enzymatic browning inhibition potential, furthermore, the inhibitory capacity was heightened when reacted via the MR

Effects of Once-Weekly Exenatide on Cardiovascular Outcomes in Type 2 Diabetes.

Abstract BACKGROUND: The cardiovascular effects of adding once-weekly treatment with exenatide to usual care in patients with type 2 diabetes are unknown. METHODS: We randomly assigned patients with type 2 diabetes, with or without previous cardiovascular disease, to receive subcutaneous injections of extended-release exenatide at a dose of 2 mg or matching placebo once weekly. The primary composite outcome was the first occurrence of death from cardiovascular causes, nonfatal myocardial infarction, or nonfatal stroke. The coprimary hypotheses were that exenatide, administered once weekly, would be noninferior to placebo with respect to safety and superior to placebo with respect to efficacy. RESULTS: In all, 14,752 patients (of whom 10,782 [73.1%] had previous cardiovascular disease) were followed for a median of 3.2 years (interquartile range, 2.2 to 4.4). A primary composite outcome event occurred in 839 of 7356 patients (11.4%; 3.7 events per 100 person-years) in the exenatide group and in 905 of 7396 patients (12.2%; 4.0 events per 100 person-years) in the placebo group (hazard ratio, 0.91; 95% confidence interval [CI], 0.83 to 1.00), with the intention-to-treat analysis indicating that exenatide, administered once weekly, was noninferior to placebo with respect to safety (P<0.001 for noninferiority) but was not superior to placebo with respect to efficacy (P=0.06 for superiority). The rates of death from cardiovascular causes, fatal or nonfatal myocardial infarction, fatal or nonfatal stroke, hospitalization for heart failure, and hospitalization for acute coronary syndrome, and the incidence of acute pancreatitis, pancreatic cancer, medullary thyroid carcinoma, and serious adverse events did not differ significantly between the two groups. CONCLUSIONS: Among patients with type 2 diabetes with or without previous cardiovascular disease, the incidence of major adverse cardiovascular events did not differ significantly between patients who received exenatide and those who received placebo. (Funded by Amylin Pharmaceuticals; EXSCEL ClinicalTrials.gov number, NCT01144338 .)

THE ANTIMICROBIAL ACTIVITIES OF SCLEROCARYA BIRREA EXTRACTS AGAINST THREE STRAINS OF PATHOGENIC YEASTS

Sclerocarya birrea is used by some of South African traditional healers for the treatment of skin disorders and epilepsy. The leaves, barks and roots of this plant were scientifically investigated for antifungal activity against Candida parapsilosis, Cryptococcus albidus and Rhodotorula mucilaginosa which are opportunistic and systemic skin pathogens. The phytochemical constituents of finely ground plant parts were extracted using four different solvents (hexane, dichloromethane, acetone and methanol). The phytochemical analysis, antioxidant activity and bioautography were evaluated on chromatograms separated by eluting systems, BEA (benzene: ethanol: ammonia), CEF (chloroform: ethyl acetate: formic acid) and EMW (ethyl acetate: methanol: water). The antifungal activities were tested against all organisms and extracts. Amphotericin B was used as the positive control. Methanol yielded the highest quantity of extracts while acetone had the highest antifungal activity. The phytochemical analysis revealed the presence of different compounds on the chromatograms. The eluting system BEA had the best separation for all extracts. Acetone, ethanol and methanolic bark extracts had the lowest MIC values of 0.16 mg/ml against all tested pathogens. All bark extracts extrated with non polar or intermediate polar solvents were not active. Polar extracts had high activity, high enough to consider for clinical application and for isolation and characterization of antifungal compounds. Acknowledgements: The National Research Foundation (NRF) and Department of Biochemistry, Microbiology and Biotechnology, University of Limpopo provided financial assistance

“Saying goodbye” during the COVID-19 pandemic: A document analysis of online newspapers with implications for end of life care

Background: News media create a sense-making narrative, shaping, reflecting and enforcing cultural ideas and experiences. Reportage of COVID-related death and bereavement illuminates public perceptions of, and responses to, the COVID-19 pandemic. Aim: We aimed to explore British newspaper representations of ‘saying goodbye’ before and after a COVID-related death and consider clinical implications. Design: Document analysis of UK online newspaper articles published during two week-long periods in March-April 2020. Data sources: The seven most-read online newspapers were searched: The Guardian, The Daily Mail, The Telegraph, The Mirror, The Sun, The Times and The Metro. Fifty-five articles discussed bereavement after a human death from COVID-19, published during 18/03-24/03/2020 (the UK’s transition into lockdown) or 08/04-14/04/2020 (the UK peak of the pandemic’s first wave). Results: The act of ‘saying goodbye’ (before, during and after death) was central to media representations of COVID bereavement, represented as inherently important and profoundly disrupted. Bedside access was portrayed as restricted, variable and uncertain, with families begging or bargaining for contact. Video-link goodbyes were described with ambivalence. Patients were portrayed as ‘dying alone’ regardless of clinician presence. Funerals were portrayed as travesties and grieving alone as unnatural. Articles focused on what was forbidden and offered little practical guidance. Conclusion: Newspapers portrayed COVID-19 as disruptive to rituals of ‘saying goodbye’ before, during and after death. Adaptations were presented as insufficient attempts to ameliorate tragic situations. More nuanced and supportive reporting is recommended. Clinicians and other professionals supporting the bereaved can play an important role in offering alternative narratives