Ultra-high performance liquid chromatographic determination of aflatoxin M1 in urine

The development of analytical methods to detect aflatoxin B1 (AFB1) in foodstuffs and its metabolites in human biological samples is useful for risk assessment. The latter methodology, i.e. the measurement of AFB1 biomarkers, has become important to assess human aflatoxin exposure. AFB1-lysine adduct, AFB1-DNA adduct and urinary aflatoxin M1 (AFM1) are some of the AFB1 biomarkers that can be measured by several analytical methods, such as enzyme-linked immunosorbent assay, radioimmunoassay, and high performance liquid chromatography (HPLC). HPLC coupled to a fluorescence detector is useful and preferable due to its high degree of sensitivity, but the analysis may take time and consume large amount of solvents. Therefore, the present study extrapolated the HPLC method to ultra-HPLC for the determination of urinary AFM1. After the extraction procedure with an immunoaffinity column, chromatographic separation was done using a high performance 1.8 μm microparticulate C18 column. The mean recovery from urine samples spiked with 0.5, 1.0 and 2.0 ng/ml AFM1 was 84.4±4.0%, with acceptable recovery values, interday (6.0±5.3%) and intraday (2.6±0.6%) coefficients of variation. The retention time was 5.7 min. This method was used to measure urinary AFM1 in 71 subjects, of which 13 had AFM1 levels above the limit of detection (0.018 ng/ml). The mean urinary AFM1 level of the positive samples was 18.8±28.6 pg/ml, ranging from 2.4 to 100.4 pg/ml. As this is one of the few studies investigating the occurrence of aflatoxin biomarkers in human biological samples in Malaysia, a study with a larger sample size is necessary to investigate the magnitude of aflatoxin exposure among the population

Neuroprotective potentials of honey for cerebral small vessel disease

The nectar produced by bees in nature is known as honey and has been consumed for its nutritional and medicinal properties. There is growing evidence that honey and its compounds have anti-inflammatory, antioxidant and anti-microbial properties that are relevant to the maintenance of health and the prevention of illnesses, including cardiocerebrovascular disease. Cerebral small vessel disease (CSVD) is one of the major risk factors for diseases such as stroke, dementia, Alzheimer’s disease, and Parkinson’s disease. CSVD is prevalent with aging and the presence of vascular risk factors. Its most common deleterious effect on the brain parenchyma is a neurological problem, causing a spectrum of subtle clinical manifestations such as neurocognitive dysfunction, emotional or behavioral disturbances, and gait dysfunction. Moreover, the pathological mechanisms and preventive strategies for CSVD remain elusive, which is reflected in the continued lack of effective therapeutic and preventive therapies. Given the growing literature on honey and its compounds as a superfood-based preventive measure, this narrative review highlights the neuroprotective potentials of honey and its compounds in relation to the current understanding of CSVD pathomechanism