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Targeted extraction of active compounds from natural products by molecularly imprinted polymers

100%
Pardo A., Mespouille L., Dubois P., Duez P., Blankert B.
Open Chemistry
|
2012
|
vol. 10
|
issue 3
751-765
EN
One of the most promising separation techniques that have emerged during the last decade is based on the use of molecularly imprinted polymers (MIPs). MIPs are stable polymers that possess specific cavities designed for a template molecule, endowed with excellent selectivity compared to regular solid phase extraction techniques. Molecularly imprinted solid-phase extraction (MISPE) has already shown a high efficiency for the sample preparation from complex matrices. Natural products received huge attention in recent years. Indeed, the application of MISPE for the screening of natural products appears extremely interesting not only for the selective extraction of a target compound but also for the concomitant discovery of new drug candidates, promising sources of therapeutic benefits. In the present review, examples of recognition and separation of active components from natural extracts are emphasized. MIPs are very promising materials to mimic the recognition characteristics exhibited by enzymes or receptors although further developments are necessary to fully exploit their wide potential.
2
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Blood pressure increase detected by ambulatory monitoring correlates with hypoxemia reflecting sleep apnea severity

88%
Grešová S., Tomori Z., Kurpas M., Marossy A., Vrbenská A., Kundrík M., Donič V.
Open Medicine
|
2009
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vol. 4
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issue 2
222-232
EN
Ambulatory blood pressure monitoring and parallel polysomnographic study were performed in 116 adult males divided into 6 groups. Thirty blood-pressure (BP) and polysomnographic variables were measured to test their usefulness for screening for both arterial hypertension and sleep apnea-hypopnea syndrome (SAHS). The development of severe breathing disorders and hypoxemia during sleep was attributed to SAHS, when compared with measurements in healthy controls and in patients with arterial hypertension. Such disorders manifested as an increased apnea-hypopnea index, apnea index, duration of arterial oxygen saturation of less than 85%, and decrease of average arterial oxygen saturation that correlated with nocturnal average diastolic BP (p=0.0049, p=0.0027, p=0.049 and p=0.0457, respectively). These respiratory disorders resulted in various nocturnal, rather than diurnal, and diastolic and systolic BP variables. The acute antihypertensive effect of continuous positive airway pressure therapy for SAHS significantly reduced the episodes of apnea and hypopnea and the secondary component of hypertension caused by excessive sympathetic stimulation. For the SAHS-induced, dose-dependent component of hypertension that responded to continuous positive airway pressure, the following variables, in decreasing significance, were useful: nocturnal average systolic and diastolic BP and 24-hour average systolic and diastolic BP, as well as percent time elevation and mean blood pressure load. The monitoring of these variables could contribute to early diagnostic and prognostic stratification of complications and adequate therapy of the secondary component of hypertension caused by SAHS.
3
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Decision Accuracy for the Relevant-Irrelevant Screening Test: Influence of an Algorithm on Human Decision-Making

88%
Krapohl D. J., Goodson W.
European Polygraph
|
2015
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vol. 9
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issue 4
189-208
4
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Inflation of diagnostic tests in hypertensive young adults: a need for diagnostic guideline?

88%
Kirkpantur A., Arici M., Altun B., Turgan C.
Open Medicine
|
2009
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vol. 4
|
issue 2
233-240
EN
The cause of hypertension in young adults (age:18–29 years) is mostly a primary condition although secondary causes are frequent in this population. Clinical files of 100 patients were reviewed to evaluate the use of diagnostic tests after completion of diagnostic work-up for hypertension. Seventy-nine patients had primary hypertension while 21 patients had secondary hypertension. Renal imaging studies, serum levels of aldosterone and plasma renin activity, and screening tests for pheochromocytoma were more likely to be performed in patients younger than 24 years, in female patients and in patients without familial history of hypertension in primary hypertensive patients (p<0.05). Renal imaging studies and screening tests for pheochromocytoma were done more frequently in patients with Stage 2 hypertension (p<0,05). Among secondary hypertensives, renal imaging studies and renal biopsy were more ordered in patients younger than 24 years, in female patients, in patients with Stage 2 hypertension and in patients without family history for hypertension (p<0.05). Mean body mass index was higher in patients with primary hypertension than patients with secondary hypertension (p<0.05). Seventy patients (70%) had undergone several screening interventions with negative results. In conclusion, a simple, stepwise diagnostic evaluation would greatly benefit the management of young hypertensives.
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