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Fibre-rich fruit juices are playing an increasing role in healthy nutrition, and consumers are regarding them, especially citrus juices of 100% fruit content, as reliable sources of vitamin C. Nevertheless relatively few scientific data are available on vitamin C retention during the heat treatment of aseptically packed fruit juices made from fruit concentrates. Authors investigated this problem within the scope of OTKA T 014965 research project (Körmendy et al., 1998, 1999a, 1999b; Pátkai, 1998).

Instead of separate case studies on different types of fruit juices and technologies, authors analysed the vitamin C content of model solutions with similar composition to real citrus juices as a function of temperature and duration of heat treatment and that of initial oxygen and ascorbic acid concentration. Based on the measured data, they elaborated kinetic relations and determined the reaction rate constants of vitamin C decomposition under the experimental conditions. By means of the calculated kinetic relations and reaction rate constants one can estimate the losses of vitamin C in the case of known parameters of the heat treatment, packaging material, oxygen and vitamin C concentration within the investigated domain. Results may promote technology and product development in the field of citrus fruit juices.

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Orvosi Hetilap
Authors: Viktória Ferencz, Beatrix Domján, László Gerő, Tímea Tänczer, and Gy. Ádám Tabák

Absztrakt

Az inzulinkezelés a cukorbetegség leghatékonyabb kezelési módja. A microvascularis szövődmények kockázatának egyértelmű csökkentése és az esetleges hosszú távú cardiovascularis előnyök elérésének azonban ára van: a (súlyos) hypoglykaemia kockázata 2–3-szorosára nő, továbbá az inzulinkezelt betegek testsúlya gyorsabban növekszik, mint az egyéb kezelésben részesülőké. Egy vizsgálatban ráadásul az intenzív glykaemiás kezelés mellett (ami gyakrabban igényelt inzulint) növekedett az összmortalitás is. Jól ismert ezeken kívül az inzulin növekedési faktorszerű hatása, ami fokozott mitogenitást eredményezhet. Ezen potenciális mellékhatások mind a beteg, mind az orvos részéről gátat szabhatnak az inzulinterápia elkezdésének. A közleményben a szerzők bemutatják, hogy a cukorbetegség diagnózisakor alkalmazott átmeneti intenzív inzulinkezelés hosszú távú remissziót eredményezhet. Tárgyalják továbbá az inzulinkezelés elkezdésének optimális módját (napi egyszeri bázisinzulin), illetve az intenzifikálás lehetőségeit is. Kitérnek az analóg inzulinok farmakokinetikai előnyeire, és bemutatják, hogy az új bázisanalógok mellett hasonló hatékonyság érhető el, mint a humán inzulinnal, miközben a hypoglykaemia kockázata körülbelül 20–30%-kal csökken. Orv. Hetil., 2015, 156(36), 1443–1450.

Open access

Abstract

Epidemics and pandemics have happened throughout the history of mankind. Before the end of the 20th century, scientific progress successfully eradicated several of the pathogens. While no one has to be afraid of smallpox anymore, there are some new pathogens that have never caused human disease before. Coronaviruses are a family of enveloped RNA viruses. In the 21st century, three of them have caused serious pandemics, including severe acute respiratory syndrome in 2002 and Middle East Respiratory Syndrome in 2012. In 2019 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) caused the coronavirus disease-19 (COVID-19) pandemic, which has destroyed hundreds of thousands of lives and continues to rage.

Open access

Abstract

Epidemics and pandemics have happened throughout the history of mankind. Before the end of the 20th century, scientific progress successfully eradicated several of the pathogens. While no one has to be afraid of smallpox anymore, there are some new pathogens that have never caused human disease before. Coronaviruses are a family of enveloped RNA viruses. In the 21st century, three of them have caused serious pandemics, including severe acute respiratory syndrome in 2002 and Middle East Respiratory Syndrome in 2012. In 2019 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) caused the coronavirus disease-19 (COVID-19) pandemic, which has destroyed hundreds of thousands of lives and continues to rage.

Open access