Search results for "polifenol"
showing 10 items of 55 documents
Non-Thermal Ultrasonic Extraction of Polyphenolic Compounds from Red Wine Lees
2020
This study presents the results of conventional aqueous (CE) and non-conventional ultrasound-assisted (UAE) extractions of polyphenolic compounds from lees extracts of red wine varieties (Merlot and Vranac). The effect of ultrasound extraction time (t, s), and amplitude (A,%) from a 400 W ultrasound processor with different ultrasonic probes diameters (Ds, mm) on the amount and profile of polyphenolic compounds in the obtained extracts was investigated and compared to CE. The optimal conditions resulting in maximum extraction of phenolic compounds were: Probe diameter of 22 mm, amplitude 90% and extraction time for Vranac wine lees 1500 s and for Merlot wine lees extraction time of 1361 s. …
Lipīdu un polifenolu sastāva salīdzinājums krūmmelleņu (Vaccinium corymbosum) kultivāros un citās Vaccinium ģints ogās
2018
Lipīdu un polifenolu sastāva salīdzinājums krūmmelleņu (Vaccinium corymbosum) kultivāros un citās Vaccinium ģints ogās. Meijere E. K., zinātniskā vadītāja docente, Dr. ķīm. Ilva Nakurte, Bakalaura darbs, 53 lappuses, 20 attēli, 17 tabulas, 38 literatūras avoti, 2 pielikumi. Latviešu valodā. Literatūras apskatā apkopota informācija par krūmmelleņu (Vaccinium corymbosum L.) kultivāriem ‘Polaris’, ‘Patriot’,’ Chippewa’, ‘Blue crop’, ‘Blue ray’, ‘Blue gold’, ‘North blue’, ‘Duke’ un citām Vaccinium ģints ogām - zilene (Vaccinium uliginosum L.), brūklene (Vaccinium vitis-ideaea L.), mellene (Vaccinium myrtillus L.), purva dzērvene (Vaccinium oxycoccos L.), lielogu dzērvene (Vaccinium macrocarpon …
Polifenolu izdalīšana no dažādiem augu biomasas pārstrādes atlikumiem ar videi draudzīgām ekstrakcijas metodēm un iegūto produktu vispusīga raksturoš…
2018
Darbā ir izstrādāta metodoloģija augu polifenolu savienojumu ekstrakcijai no dažādiem augu biomasas pārstrādes atlikumiem: mizas, koksnes atlikumiem un biomasas ķīmiskās pārstrādes blakusproduktiem. Izmantojot dažādas ekstrakcijas metodes (Soksleta, ASE, CŠE, FBE, ME, macerācija) un to parametru optimizāciju (ekstrakcijas laiks, temperatūra, spiediens, šķīdinātājs, ciklu skaits, tieša vai secīga ekstrakcija) noteikti vispiemērotākie polifenolu ieguves apstākļi no priedes koksnes un alkšņu mizām. Izveidots vispusīgs un detalizēts polifenolu mērķsavienojumu (galvenokārt diarilheptanoīdu, stilbēnu, lignīnu) raksturojums. Izvērtēta jonu šķidrumu piemērotība lignīna frakcionēšanai salīdzinājumā …
Gazpacho consumption is associated with lower blood pressure and reduced hypertension in a high cardiovascular risk cohort. Cross-sectional study of …
2013
[Background and aim]: Hypertension is a major public health problem and a leading cause of death and disability in both developed and developing countries, affecting one-quarter of the world's adult population. Our aim was to evaluate whether the consumption of gazpacho, a Mediterranean vegetable-based cold soup rich in phytochemicals, is associated with lower blood pressure (BP) and/or reduced prevalence of hypertension in individuals at high cardiovascular risk.
Polyphenol-Rich Foods in the Mediterranean Diet are Associated with Better Cognitive Function in Elderly Subjects at High Cardiovascular Risk
2012
Brain oxidative processes play a major role in age-related cognitive decline, thus consumption of antioxidant-rich foods might help preserve cognition. Our aim was to assess whether consumption of antioxidant-rich foods in the Mediterranean diet relates to cognitive function in the elderly. In asymptomatic subjects at high cardiovascular risk (n = 447; 52% women; age 55-80 y) enrolled in the PREDIMED study, a primary prevention dietary-intervention trial, we assessed food intake and cardiovascular risk profile, determined apolipoprotein E genotype, and used neuropsychological tests to evaluate cognitive function. We also measured urinary polyphenols as an objective biomarker of intake. Asso…
Total polyphenol excretion and blood pressure in subjects at high cardiovascular risk.
2011
Background and aims Dietary factors are critical for the prevention and treatment of hypertension, but data on the effects of specific nutrients on blood pressure (BP) are scarce. The aim of this study was to assess the relationship between total polyphenol excretion (TPE) in urine, as an objective measurement of total polyphenol intake and BP in an elderly population at high cardiovascular risk. Methods and results Cross-sectional substudy of 589 high-risk participants entering in the PREDIMED trial. BP was measured and TPE was determined in urine by Folin–Ciocalteu assay. A significant positive association was observed between TPE in urine and daily intake of fruit and vegetables (F&V), c…
Dietary Polyphenol Intake is Associated with HDL-Cholesterol and A Better Profile of other Components of the Metabolic Syndrome: A PREDIMED-Plus Sub-…
2020
Dietary polyphenol intake is associated with improvement of metabolic disturbances. The aims of the present study are to describe dietary polyphenol intake in a population with metabolic syndrome (MetS) and to examine the association between polyphenol intake and the components of MetS. This cross-sectional analysis involved 6633 men and women included in the PREDIMED (PREvenció
Polyphenol intake and cardiovascular risk in the PREDIMED-Plus trial. A comparison of different risk equations
2022
Abstract Introduction and objectives Quantification of cardiovascular risk has been based on scores such as Framingham, Framingham-REGICOR, SCORE or Life's Simple 7 (LS7). In vitro, animal, and randomized clinical studies have shown that polyphenols may provide benefits to the vascular system and reduce the inflammatory response. However, some clinical-epidemiological studies have yielded inconsistent results. Our aim was to assess the possible association between intake of the various polyphenol classes and established cardiovascular scores. Methods This cross-sectional analysis involved 6633 PREDIMED-Plus study participants. Food polyphenol content was estimated by a semiquantitative food…
Polyphenol intake and mortality risk: a re-analysis of the PREDIMED trial
2014
[Background] Polyphenols may lower the risk of cardiovascular disease (CVD) and other chronic diseases due to their antioxidant and anti-inflammatory properties, as well as their beneficial effects on blood pressure, lipids and insulin resistance. However, no previous epidemiological studies have evaluated the relationship between the intake of total polyphenols intake and polyphenol subclasses with overall mortality. Our aim was to evaluate whether polyphenol intake is associated with all-cause mortality in subjects at high cardiovascular risk.
Parazītiskas sēnes - čagas (Inonotus obliquus) ekstraktvielas un to izmantošanas potenciāls
2021
Augu izmantošanai ārstnieciskos nolūkos ir liela nozīme cilvēka dzīvē. Augi tiek lietoti dažādu slimību ārstēšanas gadījumos un profilaksei. Inonotus obliquus, kas pazīstams arī kā čaga, ir parazītiska sēne, kas aug uz bērziem un ko tradicionālajā medicīnā izmanto dažādu veselības problēmu ārstēšanai. Pēc daudziem klīniskajiem pētījumiem, kurus veica pagājušā gadsimta vidū, šo sēņu vērtīgās īpašības tika pierādītas un līdz ar to tās atzīst arī mūsdienu medicīnā. Darbā tiks apskatītas parazītiskās sēnes – čagas (Inonotus obliquus) ekstraktvielas, kas pozitīvi ietekmē organismu. Sēnei piemīt antibakteriālas, pretsāpju, pretiekaisuma īpašības, kā arī tā spēj spēcināt imunitāti. Bakalaura darba…