Enhancement of nutritional value and antioxidant properties of blackcurrant juice powder by usin protein-based carrier

Trabajo presentado al 15th World Congress on Polyphenols Applications, celebrado en Valencia (España) del 28 al 30 de septiembre de 2022.Peer reviewe

The Influence of Maltodextrin and Inulin on the Physico-Chemical Properties of Cranberry Juice Powders

Cranberry juice has a high content of polyphenols, which makes it a valuable raw material with health-promoting properties. On the other hand, the bitter and astringent taste of cranberry limits its consumption in fresh form (fruit, juice). For this reason, new formulations of cranberry products based on natural additives are sought, e.g., in the form of carriers, which not only allow the drying of liquids to form powders, but which can also affect the retention of bioactive compounds. This study aimed at the evaluation of the influence of different carriers and concentrations applied to cranberry juice and their influence on the physico-chemical properties of the powders obtained. Freeze-dried powders had approximately eight times higher moisture content than products gained after the spray-drying process. The bulk density of freeze-dried product was approximately 11% higher when compared to spray-drying. Freeze-drying and spray-drying had a similar influence on the total polyphenolic compound content and antioxidant capacity. When the concentration of carriers was concerned, it was indicated that a higher content of carrier resulted in a lower moisture content, water activity, CIE L*a*b* coordinates, total polyphenolic content, and antioxidant capacity of the powders obtained, pointing to a strong influence of the juice composition on the final properties of the powders

Juice powders from rosehip (rosa canina l.) ::physical, chemical, and antiglycation properties

Fruits from rosehip (Rosa canina L.) are gaining popularity due to their content and profile of bioactive components. Rosehip is distinct for its antioxidant, immunomodulatory, and anticancer properties. However, the abundance of these bioactives led to a tart taste, resulting in its consumption mainly in processed form. Due to microbiological safety, pasteurization is the preferred way of processing, which affects the chemical properties of the juice. A promising approach to improve acceptability of rosehip’s physical properties, while preserving its bioactive compounds and adding health-promoting benefits, is to enrich the rosehip juice with functional carriers before drying. The influence of the carrier type (maltodextrin, inulin, trehalose, palatinose) and drying technique (spray- and freeze-drying) on the physical, chemical, and antioxidant properties of pasteurized, and non-pasteurized juice powders was examined in this study. In addition, the ability of powders with functional carriers to inhibit protein glycation was evaluated. Spray drying led to products with improved physical properties in relation to freeze-drying. The addition of carrier substances significantly influenced the antioxidant capacity determined by TEAC ABTS and FRAP methods, whereby the application of inulin and palatinose retained antioxidant capacity better than the frequently used maltodextrin. Moreover, rosehip juice powders showed a promising ability to inhibit protein glycation

The Effect of Thermal Treatment on Selected Properties and Content of Biologically Active Compounds in Potato Crisps

The aim of this study was to determine the effect of blanching and frying on selected properties of potato crisps of yellow- and purple-fleshed cultivars. The material used was yellow flesh cv. Ismena and purple flesh cv. Provita. Potato slices were blanched (1–5 min at 80–90 °C) and then fried (155–175 °C). The control sample was comprised of crisps that were not blanched. The fat content and color parameters were determined in crisps, while in defatted samples, the following were determined: the content of total polyphenols; antioxidant capacity, measured by the ability to scavenge the ABTS•+ radical cations (TEAC ABTS) and by the FRAP method; and the level of fluorescent intermediary compounds (FICs) and browning index (BI), as indicators of the progress of the Maillard reaction. The content of kynurenic acid (KYNA) was examined in the raw material, in slices, in the water after blanching and in the crisps. Blanching affected the fat absorption, with time being more critical than temperature. The color of crisps from yellow flesh potatoes after blanching lightened, while the color in the purple samples darkened. The content of total polyphenols was higher in purple crisps. Increasing the temperature and shortening the time of blanching increased the polyphenol content and the antioxidant capacity. Blanching decreased the level of FICs, while frying increased FICs. Higher BI values characterized the crisps from cv. Provita. Blanching reduced BI values by 50%, while frying at highest temperature increased these values. The content of KYNA in purple potatoes was almost three times higher than in yellow ones. Blanching and frying decreased the KYNA content in potatoes and fried crisps

Juice Powders from Rosehip (<i>Rosa canina</i> L.): Physical, Chemical, and Antiglycation Properties

Fruits from rosehip (Rosa canina L.) are gaining popularity due to their content and profile of bioactive components. Rosehip is distinct for its antioxidant, immunomodulatory, and anticancer properties. However, the abundance of these bioactives led to a tart taste, resulting in its consumption mainly in processed form. Due to microbiological safety, pasteurization is the preferred way of processing, which affects the chemical properties of the juice. A promising approach to improve acceptability of rosehip’s physical properties, while preserving its bioactive compounds and adding health-promoting benefits, is to enrich the rosehip juice with functional carriers before drying. The influence of the carrier type (maltodextrin, inulin, trehalose, palatinose) and drying technique (spray- and freeze-drying) on the physical, chemical, and antioxidant properties of pasteurized, and non-pasteurized juice powders was examined in this study. In addition, the ability of powders with functional carriers to inhibit protein glycation was evaluated. Spray drying led to products with improved physical properties in relation to freeze-drying. The addition of carrier substances significantly influenced the antioxidant capacity determined by TEAC ABTS and FRAP methods, whereby the application of inulin and palatinose retained antioxidant capacity better than the frequently used maltodextrin. Moreover, rosehip juice powders showed a promising ability to inhibit protein glycation

Bioactive properties of blueberry extracts obtained by different drying techniques against Helicobacter pylori

Trabajo presentado al 3rd International Electronic Conference on Foods: Food, Microbiome, and Health, celebrado on-line del 1 al 15 de octubre de 2022.This research was funded by MINECO (Spain), Project HELIFOOD (AGL2017-89566-R).Peer reviewe

Bioactive properties of blueberry extracts obtained by different drying techniques against Helicobacter pylori

Helicobacter pylori (H. pylori) is widely recognised as one of the most prevalent human pathogens, which infects more than 50% of the population worldwide. Chronic inflammation of the gastric mucosa is one of the main consequences of this infection and is related to the risk of developing gastric cancer. Currently, due to the high association between H. pylori infection and the progression of gastric cancer, most therapeutic treatments aim to eradicate the bacteria using different antibiotics in combination with a proton pump inhibitor in triple or quadruple therapy. However, resistant strains have increased significantly, requiring new therapeutic tools. Blueberries are rich in different bioactive compounds with antibacterial and anti-inflammatory properties that could contribute to reducing the problems associated with H. pylori infection. The aim of this research was to analyse the antibacterial and anti-inflammatory properties of different blueberry extracts (from Bluejay, Berkley, and Bluecrop varieties) obtained by different drying methods (freeze-drying (FD), vacuum drying at 50 °C, 70 °C and 90 °C (VD), and spray drying (SD)) against H. pylori infection. The results showed that all blueberry extracts exhibited antibacterial effects against H. pylori, with some of these extracts being bactericidal, while the rest reduced bacterial growth by more than 5 log CFU/mL. The Bluecrop extracts were the most active because all the extracts obtained by the different drying methods were bactericidal. The extracts obtained by vacuum drying (VD) at 50ºC were the most effective since the extracts of the three varieties were bactericidal. Regarding anti-inflammatory activity, all blueberry extracts reduced IL-8 secretion in the H. pylori-infected gastric cells. The Bluecrop extracts obtained by VD at 70 °C and 90 °C reduced IL-8 production by 30% and 32%, respectively. These results suggest that the blueberry extracts used in the present work and obtained by different drying methods could constitute a useful alternative for controlling H. pylori growth and in the modulation of the gastric inflammatory process induced in H. pylori infection.This research was funded by MINECO (Spain), Project HELIFOOD (AGL2017-89566-R).Peer reviewe

Matrix changes driven by cultivar diversity, inulin addition and drying techniques - shaping the antioxidant, antimicrobial and anti-inflammatory properties of blueberry powders

Quality of fruit powders is ambiguously shaped by processing parameters depending on matrix composition. Thus, the objective was to evaluate influence of drying techniques and inulin application on physico-chemical, antioxidant, antibacterial and anti-inflammatory properties of sugar-free juice extract powders prepared from three blueberry cultivars. Drying significantly affected physical attributes, pointed vacuum drying as preferred. The highest phenolics content was ensured by spray- and freeze-drying (9.32–30.36 and 9.25–30.94 mg · 100 g−1 dry matter, respectively). Inulin lowered bioactives by 48% and alleviated cultivar-driven differences in powders. Phenolic profile affected antibacterial activity towards Campylobacter jejuni stronger than phenolic content. Ten out of fifteen carrier-free powders showed bactericidal effect against Helicobacter pylori, while one among inulin-added. Vacuum drying improved anti-inflammatory properties in gastric cell cultures infected with Helicobacter pylori of selected blueberry products compared to spray- and freeze-drying. The study provides comprehensive insight into blueberry powders manufacturing with high scientific and practical significance.This work was supported by “UPWR 2.0: international and interdisciplinary programme of development of Wrocław University of Environmental and Life Sciences”, co-financed by the European Social Fund under the Operational Program Knowledge Education Development, under contract No. POWR.03.05.00–00-Z062/18 of June 4, 2019. The study was conducted under Grant NCN Sonata 12 [2016/23/D/NZ9/02671] and Grant AGL2017–89566-R (HELIFOOD) funded by MCIN/AEI/10.13039/501100011033/ and by ‘ERDF A Way of Making Europe’.Peer reviewe