Fulltext search in archive
Results 61 to 90 of 170:
Biocontamination in the dairy industry: The effect of raw milk conditioning film on the adhesion of Escherichia coliOriginal PaperZakariyae El hafa, Ikhlas Hani Chennoufi, Hafida Zahir, Mostafa El louali, Hassan LatracheCzech J. Food Sci., 2025, 43(2):112-117 | DOI: 10.17221/91/2024-CJFS Conditioning films on surfaces employed in the dairy industry serve as the precursors to the formation of pathogenic biofilms that impact product quality and consumer safety. Conditioning films have been studied from several aspects. However, there has been no study that evaluated the effect of raw milk conditioning film on the adhesion of Escherichia coli. This study investigated the adhesion of E. coli on glass and stainless-steel surfaces conditioned with raw milk and explored the surface properties potentially influencing this adhesion using the contact angle method. The results showed that after treating surfaces with raw milk, the adhesion of the bacteria on stainless steel and glass was significantly altered. Adhesion increased significantly on stainless steel (from 0.55 log10 to 2.8 log10) but it decreased on glass (from 1.56 log10 to 0.8 log10). Significant alterations were observed in the physicochemical properties of the surfaces. Glass was initially relatively hydrophilic (46.33°), while stainless steel was relatively hydrophobic (82.5°). After treatment, the glass became relatively more hydrophobic (74.6°), and stainless steel became relatively more hydrophilic (69.4°). The electron donor/acceptor components of glass decreased after the treatment, while these components increased for stainless steel. The significant changes in adhesion were hypothesized to be due to the modification of surface properties by the raw milk. |
Immobilised Aspergillus niger lipase synthesises sn-1,3-dioleoyl-2-palmitoylglycerolOriginal PaperShanhui Chen, Renbin Liu, Dong Wang, Shiyou Li, Zhirong YangCzech J. Food Sci., 2025, 43(4):291-299 | DOI: 10.17221/143/2024-CJFS sn-1,3-Dioleoyl-2-palmitoylglycerol (OPO) is a structural triglyceride with a specific distribution of fatty acids, which is an important component of breast milk fat and which can better promote the absorption of minerals and energy in infants. In this study, a lab-made immobilised Aspergillus niger lipase (IM-ANL), which is more economical than a commercial lipase, was used for hydrolysis to produce free fatty acids (FFA) and acidolysis interesterification to produce OPO. The enzyme was used for multiple purposes, reducing the cost of enzymatic production. The optimum conditions for hydrolysis were determined by experiments: the amount of IM-ANL enzyme dosage was 3%, the reaction temperature was 45 °C, and the reaction time was 48 h. The optimum conditions for acidolysis interesterification were as follows: the amount of IM-ANL enzyme dosage was 4%, the molar ratio of tripalmitin to oleic acid was 1 : 8, the reaction temperature was 55 °C, and the reaction time was 3 h. In this study, economical palm stearin and high oleic acid sunflower seed oil were selected as reaction raw materials, and the reaction temperature was moderate, the safety risk was low, the energy consumption was reduced, the process was more economical, and the economic value of high oleic acid vegetable oil was improved, which was conducive to the further promotion of OPO production. |
Ginger essential oil-infused pectin-alginate films for extending sliced bread shelf lifeOriginal PaperNguyen Hong Khoi Nguyen, Nam Quoc Tran, Thuan Huynh Dinh Nguyen, Quyen Phuong HuynhCzech J. Food Sci., 2025, 43(6):438-449 | DOI: 10.17221/24/2025-CJFS This study examines composite films made from pectin and alginate, enhanced with ginger essential oil (GEO) at 0, 0.5, 1, and 1.5% concentration. The films were analysed for their structure, physical properties, antioxidant and antibacterial activities, and effectiveness in preserving sliced bread over 0, 2, 4, 6, and 8 days. The outcomes presented that incorporating GEO upgraded pectin-alginate films' properties. SEM images revealed increased essential oil distribution on the film surface with higher GEO concentrations, indicating good compatibility. Higher GEO concentrations enhanced the films' abilities to scavenge free radicals DPPH, 2,2-diphenyl-1-picrylhydrazyl; and ABTS, 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) and inhibit bacteria (Listeria monocytogenes and Escherichia coli). Furthermore, increasing GEO concentrations in the films helped maintain key quality attributes of sliced bread, such as moisture content, water activity, microbial counts, and firmness. Films with 1.0 and 1.5% GEO concentrations were the most effective in preserving bread, potentially inhibiting mould formation and maintaining sensory properties over the 8-day storage period. This study demonstrates that pectin-alginate films supplemented with GEO at 1 and 1.5% concentration are suitable for storing sliced bread. |
Formulation optimisation for pilot-scale honey powder production: A response surface methodology and central composite design approachOriginal PaperAngelina Risky Maharani, Lilik Eka Radiati, Agus Susilo, Firman Jaya, Anang Lastriyanto, Dewi MasyithohCzech J. Food Sci., 2024, 42(1):45-54 | DOI: 10.17221/215/2023-CJFS
|
Effect of different forms of buckwheat addition on the physicochemical and sensory properties of breadOriginal PaperErdi Eren, Murat Reis AkkayaCzech J. Food Sci., 2024, 42(3):216-223 | DOI: 10.17221/36/2024-CJFS This study aimed to obtain buckwheat bread by adding whole buckwheat to the white bread formulation in groat and flour form. The addition was made in different proportions (0, 10, 20, and 30%) according to the principle of substitution. Buckwheat addition, as groat, increased the bread's hardness to a great extent. Moisture analysis results indicated that the buckwheat additive can increase the water-holding capacity and may extend the shelf life, especially in flour form. The samples' antioxidant activities and phenolic content significantly increased when the addition was made as flour. All buckwheat-added samples had lower volume values than control samples. Buckwheat addition caused an increase in volatile components such as phenylethanol and benzylalcohol. As a result of sensory analysis, using buckwheat as flour and groat positively affected breadmaking. Considering the samples' nutritional and sensory properties, the combination in which 20% buckwheat flour is added to the white bread formulation is the most appropriate use. |
Comparative study on quality parameters of dry-cured beaver (Castor fiber) and nutria (Myocastor coypus) sausagesOriginal PaperJan Slováèek, ©árka Nedomová, Markéta Janík Piechowiczová, Ondøej Mikulka, Miroslav JùzlCzech J. Food Sci., 2024, 42(5):382-389 | DOI: 10.17221/112/2024-CJFS The aim of the study was to define and compare the quality properties of dry-cured heat-treated meat products from the meat of free-living semi-aquatic wildlife species. Eurasian beaver (Castor fiber) and nutria (Myocastor coypus) are wild animals whose presence in the countryside is regulated in the Czech Republic. Basic chemical, microbiological, sensory analyses, and instrumental measurements of the colour and texture of dry-cured sausages (pork, as a control group with 51% lean pork and experimental groups with 51% lean beaver and nutria meat in fresh state) were performed. There were no statistically significant differences (P > 0.05) in microbiological counts per gram between the sausage groups according to the meat used after 3 weeks of storage. In the sensory analysis, beaver sausages were rated as the darkest and least attractive (P < 0.05). The data obtained using the Meullenet-Owens Razor Shear (MORS) test did not show a statistically significant difference (P > 0.05). However, a significant difference (P < 0.05) was measured between the beaver product and the pork and nutria variants using the compression method. |
Green synthesis, characterisation, and antibacterial activity of silver nanoparticles obtained from Salvia officinalis extractOriginal PaperNural Karagözlü, Tuğçe ÖzeºerCzech J. Food Sci., 2024, 42(3):163-173 | DOI: 10.17221/4/2024-CJFS
|
Analysis of the quality of curds from Slovakia and neighbouring countriesOriginal PaperJana Záhumenská, Franti¹ek Zigo, Tomá¹ Mihok, Mariana Kováèová, Zuzana Farka¹ová, Jana Výrostková, Zuzana Lacková, Mária VargováCzech J. Food Sci., 2024, 42(5):317-329 | DOI: 10.17221/51/2024-CJFS The work deals with the evaluation of the quality of curds produced in Slovakia and neighbouring countries (Czech Republic, Poland, Hungary, Ukraine) at the time of their purchase and at the time of the end of the warranty period. Significant differences in consistency (P < 0.05) were found between the model samples of cottage cheese after sensory evaluation. Differences in total porosity were noted between curds examined on the first and last day, storage reduced porosity and changed (reduced) grain size. There was a significant difference in colour between the samples (A1–E5) (P < 0.05). Colourimetric measurement confirmed the lightest colour in sample E4 (L* = 92.87, L* – lightness) from Ukraine, which showed the lowest fat content, and the darkest sample was sample C3 from Poland (L* = 88.62). The minimum value of dry matter content was found in sample E4 (15.79 ± 2.59%) and the maximum value in sample C3 (35.82 ± 2.59%). Towards the end of the use-by date, the dry matter values slightly decreased. Statistical significance was demonstrated between the first day of purchase and the expiration date in dry matter content (P < 0.05) and between fat content in dry matter (P < 0.05). The titration acidity was exceeded in two cases, in sample B2 (first day – FD 172 °SH / last day – LD 192 °SH) and B4 (FD 162 °SH / LD 167 °SH). During the guarantee period, the growth of micromycetes in curds was statistically significant (P < 0.05). |
Enhancement of semolina pasta with carob molasses pulpOriginal PaperSerpil Yalim Kaya, Sevcan İlhan, Özlem İstanbulu PaksoyCzech J. Food Sci., 2024, 42(2):109-117 | DOI: 10.17221/152/2023-CJFS This study aimed to determine the effect of carob molasses pulp flour (CMP) at 5.0, 7.5, and 10.0% on the chemical composition and properties of eggless semolina pasta in terms of colour, nutritional value, cooking quality, and sensory properties. As presumed, carbohydrate and energy values of CMP-added pasta (carbohydrates 73.31–77.40%) were lower than the control (82.17%), whereas dietary fibre values were up to 4 times higher (8.18–12.60% vs. 3.71%). There was not a significant difference in the amount of fat (0.48–0.70%), optimum cooking time (6.56–7.06 min), or cooking loss (10.43–12.57%) of CMP-added pasta compared to the non-enriched counterpart (P > 0.05). All formulations were sufficient in terms of sensory properties; colour shift occurred in the direction from standard yellow to the dark brown area. The results showed that even the maximal tested dosage of the CMP equal to 10.0% could produce pasta with satisfying overall quality. |
Effect of the disinfectant benzalkonium chloride on Listeria monocytogenes biofilmOriginal PaperChao Yang, Xiaochen Zhang, Tao Yu, Lin Wang, Zichuan Zhu, Xinjie FanCzech J. Food Sci., 2024, 42(4):295-304 | DOI: 10.17221/44/2024-CJFS
|
Prebiotic and antioxidant effects of the extracts from fruits and flowers of Cereus hildmannianusOriginal PaperEverton da Silva Santos, Gabriela Krausová, Ivana Hyr¹lová, Maria de Fátima Pires da Silva Machado, Arildo José Braz de Oliveira, Gizem Özlük, Regina Aparecida Correia GonçalvesCzech J. Food Sci., 2024, 42(6):415-422 | DOI: 10.17221/128/2024-CJFS
|
Modelling of desorption isotherms for dried meat: New approach and newly applied modelOriginal PaperPøemysl Richtr, Josef Bauer, Svatopluk Henke, Rudolf ©evèíkCzech J. Food Sci., 2024, 42(1):55-63 | DOI: 10.17221/170/2023-CJFS
|
Chokeberry (Aronia melanocarpa) as natural antioxidant for the meat industryOriginal PaperAndrea Mesáro¹ová, Marek Bobko, Luká¹ Jurèaga, Alica Bobková, Katarína Poláková, Al¾beta Demianová, Judita Lidiková, Ondøej Buèko, Andrea Mendelová, Tomá¹ TóthCzech J. Food Sci., 2024, 42(3):184-191 | DOI: 10.17221/38/2024-CJFS Aronia melanocarpa is one of the many fruit types rich in polyphenolic compounds. Therefore, we used this fruit in our research as a possible natural antioxidant, which was added to pork sausages. Four groups were prepared: control group, a group with ascorbic acid, and groups with 3 and 5 mL·kg–1 of chokeberry extract. During storage, we monitored changes in pH, colour, texture and oxidative stability of pork sausages and sensory evaluation. We did not observe any negative effects of the extract on the quality of pork sausages during storage. Regarding oxidative stability, the lowest increase in malondialdehyde (MDA) was observed in the group with 5 mL·kg–1 of chokeberry extract, which was comparable to the group with ascorbic acid. |
Nanocellulose as a fat substitute to improve the quality of emulsified sausages: Effects of morphology and contentOriginal PaperHongzhen Guo, Xiaolan Shang, Yunping Cheng, Qiuling LiCzech J. Food Sci., 2024, 42(5):364-371 | DOI: 10.17221/114/2024-CJFS Two different morphologies of nanocellulose – cellulose nanofibres (CNFs) and cellulose nanocrystals (CNCs) with different contents were added to emulsified sausages to replace pork back fat in different proportions (10%, 30%, and 50%), and the colour, emulsion stability, texture characteristics and dynamic rheological behaviour of emulsified sausages were analysed. The results indicate substituting fat with nanocellulose led the L* (lightness) and a* (redness) values increased and the b* (yellowness) values decreased of the emulsified sausages. Increasing nanocellulose concentration improved the emulsion stability of the sausages. In terms of emulsion stability, the use of CNFs outperformed CNCs, especially for samples substituted with 50% fat. In terms of texture, emulsified sausages where CNCs replaced fat showed lower hardness, viscosity, and chewiness compared to those with CNFs. The dynamic rheological results indicated that when the fat replacement levels were 10% and 30%, samples using CNFs as fat substitute had slightly higher storage modulus (G') values than those using CNCs. However, for 50% fat replacement, samples using CNFs as fat substitute had significantly higher G' values than those using CNCs, which demonstrates that higher CNFs concentrations are more conducive to the formation of a three-dimensional network structure. |
Assessing essential oil composition in Cinnamomum cassia leaves from different regions of China using GC-MS and FTIR spectroscopyOriginal PaperYan Huang, Yujie Liu, Huiping Tan, Yanrong Cheng, Kunyang Tao, Dingze Gu, Huaizu Cai, Chengjie Li, Kaiyi Guo, Cheng Wu, Hong Wu, Yanqun LiCzech J. Food Sci., 2024, 42(3):151-152 | DOI: 10.17221/197/2023-CJFS In this study, volatile compounds from Cinnamomum cassia Presl. leaves from different regions of China were identified using gas chromatography coupled with mass spectrometry (GC-MS) and Fourier-transform infrared (FTIR) spectroscopy combined with chemometrics. The results showed that the essential oil yields greatly varied across regions, with the density of oil cells at the accumulation and saturation stages playing a key role in this yield. GC-MS analysis revealed a higher content of trans-cinnamaldehyde in samples from the Xijiang River basin (No. 1–8) than in those from Baise Guangxi (No. 9). Variable importance in projection analysis identified five differential marker components for assessing the geographical origin of C. cassia leaves: trans-cinnamaldehyde, acetophenone, cis-cinnamaldehyde, camphor, and α-thujene. Hierarchical cluster analysis, similarity evaluation, and principal component analysis from FTIR fingerprinting indicated that essential oil compositions of samples No. 1–6 from the Xijiang River basin were closely related. In contrast, the Baise sample (Western Guangxi) significantly differed from the other eight, likely due to the geographical distance. Our results indicate that the methods employed are effective for determining the geographical distribution and assessing the quality of raw cinnamon in herbal medicine. |
Quality characteristics of Hokkaido brown bear meat sauces prepared with rice koji mold and food enzymesOriginal PaperAzusa Takeda, Masataka Saito, Takeshi NagaiCzech J. Food Sci., 2024, 42(5):372-381 | DOI: 10.17221/49/2024-CJFS
|
Influence of the storage duration on the health promoting tyrosine, tryptophan, and total phenolics in potato tubersOriginal PaperRita Asakaviciute, Zita MaknickieneCzech J. Food Sci., 2024, 42(2):93-99 | DOI: 10.17221/161/2023-CJFS This research investigated the influence of the storage duration on the health promoting tyrosine, tryptophan and total phenolics in potato tubers. In the course of storage, the total amount of accumulated compounds in the dry mass of organically grown potato tubers increases. This is determined by individual properties of potato variety, storage time, and interaction of these two factors (P < 0.05). Organic potato tubers show increased total phenolic compounds in their dry matter during storage. This is due to a variety of characteristics, storage time and the interaction of these two factors (P < 0.05). A more pronounced increase in total phenolic compounds during storage was observed in 2022 than in 2021. |
Effect of rosemary and clove essential oils on lipid oxidation, microbial, sensorial properties and storage stability of kavurma, a cooked meat productOriginal PaperSezen Harmankaya, Ahmet Harmankaya, Koray ݺbarali, Özlem İstanbullu PaksoyCzech J. Food Sci., 2024, 42(4):251-262 | DOI: 10.17221/56/2024-CJFS
|
Effects of hydroxyl radical oxidation on the structural and functional properties of mutton myosinOriginal PaperYingying Cao, Huaiyu Li, Fubing WangCzech J. Food Sci., 2024, 42(6):423-434 | DOI: 10.17221/133/2024-CJFS
|
Study of substitution of beef and tapioca flour with tuna meat and purslane flour on meatball qualityOriginal PaperNafly Comilo Tiven, Tienni Mariana SimanjorangCzech J. Food Sci., 2024, 42(1):64-70 | DOI: 10.17221/196/2023-CJFS
|
Harnessing nature's secrets: Silver nanoparticles from Withania coagulans fruit and root extracts unveil exceptional antioxidant and antimicrobial propertiesOriginal PaperFarwa Iftikhar, Rahmatullah Qureshi, Ayesha Siddiqa, Khursid Anwar, Fizza Arshad, Zia-ur-Rehman Mashwani, Aayesha Riaz, Safir Ullah Khan, Amir Ali, Shahzad Iqbal, Ajaz Ahmad, Melissa Danae Bejarano GómezCzech J. Food Sci., 2024, 42(3):192-206 | DOI: 10.17221/39/2024-CJFS Nanotechnology, an emerging field, holds significant promise with applications across diverse sectors, including medicine, agriculture, and the biological sciences. To address environmental concerns, the green biosynthesis of silver nanoparticles (AgNPs) using plant extracts is favoured. This study focuses on the formulation and characterisation of AgNPs using extracts from Withania coagulans (Stocks) Dunal, a medicinal plant that holds a unique phytochemical profile. The AgNPs derived from W. coagulans root (WcAgNPR) and fruit (WcAgNPF) extracts were characterised using ultraviolet and visible light (UV-Vis) spectral analysis, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and Fourier-transform infrared spectroscopy (FTIR) spectroscopy. The findings reveal that both WcAgNPR and WcAgNPF exhibit substantial antioxidant potential, with robust iron reducing capabilities and potent 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging activity. Additionally, they demonstrate strong hydrogen peroxide scavenging abilities. Notably, WcAgNPR outperforms WcAgNPF in the phosphomolybdate assay for antioxidant potential. Both AgNPs display remarkable antimicrobial efficacy, with minimal inhibitory concentrations (MIC) below 10 µg·mL–1 against gram-positive bacteria (Staphylococcus aureus) and noteworthy activity against gram-negative Escherichia coli (WcAgNPF with a MIC of 30 µg·mL–1 and WcAgNPR with a MIC of 60 µg·mL–1). These findings highlight the silver nanoparticles' significant antioxidant and antimicrobial potential, suggesting their potential for in vivo use as antimicrobial agents with minimal oxidative damage. |
Impacts of exopolysaccharides producing probiotic bacteria on the physicochemical and sensory properties of fermented goat yoghurt under chilled storageOriginal PaperHan Wu, Xiayidan Maimaiti, Ying Wang, Anthony Pius Bassey, Nurgvl Rahman, Xiaoli LiuCzech J. Food Sci., 2024, 42(5):305-316 | DOI: 10.17221/125/2024-CJFS This study focused on the co-fermentation of goat milk with functional lactic acid bacteria (LAB) and traditional yoghurt starter culture. The fermentation process was optimised by single factor experiment and response surface methodology (RSM). The physicochemical and sensory properties of goat milk yoghurt were evaluated under chilled (4 °C) storage for 21 days. The optimised conditions were selected as the inoculum amount of Lactobacillus paracasei NM-8 (1.1 × 107 CFU·mL–1; CFU – colony forming unit), sucrose addition (6.8%) and fermentation temperature (41 °C). During milk coagulation, the pH declined to be 4.45 and the viable LAB number arrived at 8.77 log CFU·mL–1. The content of exopolysaccharides (EPS) increased to be 2.13 g·L–1. These changes led to the better viscosity (941.33–792.33 cP) and higher water holding capacity (63.24–56.20%) of yoghurt fermented using L. paracasei NM-8 in storage, compared with those of yoghurt without L. paracasei NM-8. This study provided a theoretical basis for eliminating the whey precipitation and rough texture of goat milk yoghurt. |
Promotional effects on naturally occurring lactic acid bacteria without impairing chickpea germinationOriginal PaperEli¹ka Kováøíková, Veit Ny, Miloslav ©ulc, Jana Rysová, Natálie Peèenková, Milan Hou¹kaCzech J. Food Sci., 2024, 42(2):85-92 | DOI: 10.17221/12/2024-CJFS
|
Comprehensive nutritional profiling and antioxidant capacity assessment of indigenous mushrooms Pleurotus ostreatus and Agaricus bisporusOriginal PaperTouseef Iqbal, Muhammad Sohaib, Sanaullah Iqbal, Habib RehmanCzech J. Food Sci., 2024, 42(3):174-183 | DOI: 10.17221/158/2023-CJFS
|
The relationship between large deformation rheology of wheat flour dough with protein quantity and aggregate stretching degree of milling streams flour based on regression analysisOriginal PaperZiyan Dong, Ting Su, Meiyao Dai, Clyde Don, Boli Guo, Shuangkui Du, Bo ZhangCzech J. Food Sci., 2024, 42(5):353-363 | DOI: 10.17221/64/2024-CJFS The aim of this study was to compare the role of protein quantity and aggregate stretching degree in predicting dough stability and extensibility using the regression analysis, and to explore a more effective way of conducting the prediction. Flours from 28 milling streams of the wheat cultivar Shiluan 02-1 were collected as experimental material. Using the value of (ash content/L*) (L* – lightness), we sorted the milling streams flour from the inner layer to the outer layer of wheat kernel, which was divided into early reduction, later reduction, and break flours. Three regression models, quantity-based, stretching-degree-based and (quantity × stretching-degree)-based model for predicting dough stability and extensibility were evaluated in each category of milling streams through their coefficient of determination (R2). Certain patterns were observed in physicochemical properties of flour from different categories of milling streams. Despite those considerable changes, the quantity-based model broadly produced greater R2 values than the stretching-degree-based model, and the (quantity × stretching-degree)-based model could in general provide higher R2 values than the other two models on predicting dough stability and extensibility. The results suggest that measuring the protein quantity and aggregate stretching degree at the same time is of practical improvement in dough rheology evaluation, compared to focusing on either factor alone. |
A frontier approach for the production of enteric soft capsules containing omega-3 fatty acids and probioticsOriginal PaperHayoung Kim, Won Yeong Bang, Boyoung Choi, Han Bin Lee, Jungwoo YangCzech J. Food Sci., 2024, 42(2):127-135 | DOI: 10.17221/181/2023-CJFS
|
Phytochemical, antioxidant activity, and thermal stability of Clitoria ternatea flower extractsOriginal PaperSy-Yu Shiau, Yuhan Wang, Yanli Yu, Songling Cai, Qian LiuCzech J. Food Sci., 2024, 42(4):284-294 | DOI: 10.17221/68/2024-CJFS
|
Diversity of cultivable lactic acid bacteria and bacilli in traditional fermented foods in VietnamOriginal PaperGiang Phan Thi Hang, Markéta Husáková, Petr Ka¹tánek, Petra PatakovaCzech J. Food Sci., 2024, 42(6):435-446 | DOI: 10.17221/162/2024-CJFS
|
Effect of debranching enzyme hydrolysis and microwave treatments on the resistant starch enrichment of breadfruitOriginal PaperThanh Le, Trang Tran, Tuyen Kha*Czech J. Food Sci., 2024, 42(1):1-9 | DOI: 10.17221/136/2023-CJFS
|
Cup viscometer – A practical analytical toolShort CommunicationMilan Hou¹kaCzech J. Food Sci., 2024, 42(1):71-76 | DOI: 10.17221/159/2023-CJFS
|
