Procesare produselor ecologice

Procesarea produselor ecologice prin deshidratare este cel mai vechi procedeu de păstrare a fructelor si legumelor. Sunt trecute in revista principalele tehnici de procesare prin deshidratare, precum si proiectele europene derulate de către USAMV Bucuresti in acest domeniu: SusOrganic si EcoBerries

Tethered Ribosomes:Toward the Synthesis of Nonproteinogenic Polymers in Bacteria

The ribosome is the core element of the translational apparatus and displays unrivaled fidelity and efficiency in the synthesis of long polymers with defined sequences and diverse compositions. Repurposing ribosomes for the assembly of nonproteinogenic (bio)polymers is an enticing prospect with implications for fundamental science, bioengineering and synthetic biology alike. Here, we review tethered ribosomes, which feature inseparable large and small subunits that can be evolved for novel function without interfering with native translation. Following a tutorial summary of ribosome structure, function, and biogenesis, we introduce design and optimization strategies for the creation of orthogonal and tethered ribosomes. We also highlight studies, in which (rational) engineering efforts of these designer ribosomes enabled the evolution of new functions. Lastly, we discuss future prospects and challenges that remain for the ribosomal synthesis of tailor-made (bio)polymers.</p

Extraction of phenolic compounds from organic dried apples: comparison between conventional, microwave- and ultrasound-assisted extraction methods

The aim of this study was to compare a conventional assay with microwave- (MAE) and ultrasound- (UAE) assisted extraction methods on the extraction of phenolic compounds from organic dried apples by evaluating the content in catechin, epicatechin, chlorogenic acid and quercitrin. Samples from two apple varieties (Golden Rush and Topaz) were analyzed. Methanol/water (70:30, v/v) was selected as the solvent mixture for the phenolic compounds extractions. The High Performance Liquid Chromatography coupled to diode array detection (HPLC-DAD) were used for the identification and quantification of the respective phenolic compounds. Qualitative analysis revealed similar phenolic profiles in both apple varieties. Whatever extraction method is used, in both apple varieties chlorogenic acid and epicatechin were present in higher contents compared to catechin and quercitrin with chlorogenic acid being the major contributor. It was found a better extraction of chlorogenic acid, catechin and quercitrin (only for Topaz apple) using conventional process in comparison with MAE and UAE. A higher content of quercitrin was obtained with MAE and UAE compared to conventional method. The content of phenolic compounds in Golden Rush apple was higher than in Topaz apple. Results from this study indicated that conventional extraction can be a more efficient process than MAE and UAE for the extraction of phenolic compounds from organic dried apples

Quasi-one dimensional fluids that exhibit higher dimensional behavior

Fluids confined within narrow channels exhibit a variety of phases and phase transitions associated with their reduced dimensionality. In this review paper, we illustrate the crossover from quasi-one dimensional to higher effective dimensionality behavior of fluids adsorbed within different carbon nanotubes geometries. In the single nanotube geometry, no phase transitions can occur at finite temperature. Instead, we identify a crossover from a quasi-one dimensional to a two dimensional behavior of the adsorbate. In bundles of nanotubes, phase transitions at finite temperature arise from the transverse coupling of interactions between channels.Comment: 8 pages, 5 figures, presented at CMT3

Bioactive compounds and quality parameters in different organic apple varieties

The interest on organic plant-based foods is constantly growing due to their health benefits and ecological importance along with increasing demands of the consumers for quality foods produced sustainably. Organic apples were known to present high content in polyphenols, compounds which are recognized to have multiple biological activities [1]. The aim of this work is to evaluate the variations in quality parameters (firmness, total soluble solids and titratable acidity) and bioactive compounds (anthocyanins and vitamin C) of three organic apple varieties. Organic apple varieties (Gala, Golden and Red Prince) harvested at maturity from an organic farm in August and September 2018 were used for this study. Firmness, total soluble solids and titratable acidity were performed using instrumental analyses [2]. The total anthocyanin content was determined in acidified methanolic extracts by a spectrophotometric method whereas the vitamin C was monitored by HPLC. The firmness and titratable acidity were both significantly higher in Golden variety. The Red Prince variety showed higher total soluble solids and total anthocyanin content than Gala and Golden varieties, what recommends their use for processing immediately after harvesting or in the first few weeks, while the Golden variety can be stored under controlled conditions for further processing. The data also pointed that the Golden variety have high vitamin C content as well as higher firmness and titratable acidity values compared to the red apple varieties. From these results it can be concluded that quality parameters and bioactive compounds of organic apples are generally influenced by the variety

Indicatori di qualità e sicurezza per frutta e verdura - convenzionale vs. biologico (Modulo 2.3)

- Introduzione - La qualità di frutta e verdura - Estensione della shelf life di frutta e vegetali freschi Conservazione in atmosfera controllata (AC) Imballaggio in atmosfera modificata (MAP) Congelamento Essiccamento Regolamentazione della qualità e della sicurezza - Convenzionale vs. Biologico: definizione - Produttività ed impatto ambientale - Comportamento dei consumatori - Valori nutrizionali - Gusto - Residui negli alimenti - Metalli pesanti - Micotossine - Riferiment

Changes in carotenoid content of organic tomato powders depending in drying parameters

There are known that the functionalities of powdered natural ingredients from food products are strongly dependent on the chemical composition. The pre-treatment and type of drying can cause changes in amounts of nutritional compounds (vitamins, carotenoids, polyphenols) of fruits and vegetables. Therefore, this study investigates the effects of different drying treatments (hot air at 40 and 70 °C) on the carotenoid content of powders obtained from juice and blanched fresh organic tomatoes

Rural development in the Banat area

In the context of huge problems engendered by the European agricultural policy and related to rural area development, the rural area on the whole needs new perspectives to ensure a positive evolution of the human communities. Romania, a member of the European Union for over 5 years now, needs to valorise all its natural, human, and cultural resources of the rural area to be able to face a strong competition and to maintain biodiversity