Atte von Wright

Atte von Wright
University of Eastern Finland | UEF · Institute of Public Health and Clinical Nutrition

Professor, PhD

About

196
Publications
45,774
Reads
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11,584
Citations
Citations since 2017
9 Research Items
3703 Citations
20172018201920202021202220230100200300400500600
20172018201920202021202220230100200300400500600
20172018201920202021202220230100200300400500600
20172018201920202021202220230100200300400500600

Publications

Publications (196)
Article
Full-text available
Extracts of five organic and one conventional honey sources, available in Finnish markets, were tested for antimicrobial activity and inhibitory concentrations against Escherichia coli, Salmonella Typhi, Pseudomonas aeruginosa, Klebsiella pneumoniae, Bacillus cereus, and Staphylococcus epidermidis, obtained from human specimens. Five (honeys A, B,...
Article
The aim of this work was to study the potential of two quinoa varieties, Pasankalla (PK), and Rosada de Huancayo (RH), in developing fermented spoonable vegan products. The quinoa flours were fermented by a candidate probiotic Lactobacillus plantarum Q823. Then, two experimental products were developed by flavoring fermented PK flours with date (QD...
Article
Maize is staple food in Central and Latin America, Southern and Eastern Africa, and fermentation processes are widely used to improve food safety and quality. Atole agrio is a typical Mexican fermented maize beverage, that, unlike many others, is made with a non-nixtamalized young maize. The aim of this research was to select endogenous lactic acid...
Book
Lactic acid bacteria have throughout history had an important role for human health and well-being as well as food and feed processing. Thus, there has been a need for a book covering the areas in a multidisciplinary manner and our book has been the classic compendium in the area. This is now the fifth edition of Lactic Acid Bacteria, which include...
Article
Full-text available
There is an increasing need for innovative drug and prophylaxis discovery against malaria. The aim of the present study was to test in vivo antiplasmodial activity of Croton macrostachyus H. (Euphorbiaceae) stem bark extracts from Kenyan folkloric medicine. Inbred Balb/c mice were inoculated with erythrocytes parasitized with Plasmodium berghei (AN...
Article
Full-text available
Aims: The aim of this study was to examine the antimicrobial properties of novel aqueous natural rapeseed oil/saline emulsions containing different soluble components of spruce resin. Methods and results: The composition of aqueous resin emulsions was analyzed by GC-MS and their antimicrobial properties were studied with challenge tests and with...
Article
Our aim was to identify and characterize the lactic acid bacteria (LAB) of atole agrio, a fermented Mexican maize-based beverage and to evaluate whether starters could be obtained to produce it under controlled conditions. Atole agrio fermentation process was variable with an abundant presence of Enterobacteriaceae throughout the fermentation. Base...
Article
Full-text available
Quinoa is a crop that originated from the Andes. It has high nutritional value, outstanding agro-ecological adaptability, and low water requirements. Quinoa is an excellent crop alternative to help overcome food shortages, and it can also have a role in the prevention of developed world lifestyle diseases, such as type-2 diabetes, cardiovascular di...
Article
Probiotics are mostly consumed as fermented or fortified food products in Europe. There are two important factors in the selection of probiotic candidates regarding the potential health benefit; their viability and number when consumed, and their survival and persistence in the gastrointestinal tracts. This study focusses on the selection of potent...
Article
Full-text available
In Kenya, leaves and roots from Croton macrostachyus are used as a traditional medicine for infectious diseases such as typhoid and measles, but reports on possible antimicrobial activity of stem bark do not exist. In this study, the antibacterial and antifungal effects of methanol, ethyl acetate and butanol extracts, and purified lupeol of C. macr...
Article
Full-text available
The genome sequence of Lactococcus lactis subsp. cremoris Mast36, isolated from bovine mastitis, is reported here. This strain was shown to be able to grow in milk and still possess genes of vegetable origin. The genome also contains a cluster of genes associated with pathogenicity.
Article
Full-text available
Surfactin-type lipopeptides are suspected of being implicated in the rare food poisonings caused by Bacillus species outside the Bacillus cereus cluster. In order to get information on surfactin levels in actual human foods, bacilli from three commercial samples of a Japanese traditional bean product, natto, were isolated in order to clarify their...
Article
In this work, flexible and free-standing composite films of nanofibrillated cellulose/polypyrrole (NFC/PPy) and NFC/PPy-silver nanoparticles (NFC/PPy-Ag) have been synthesized for the first time via in situ one-step chemical polymerization and applied in potential biomedical applications. Incorporation of NFC into PPy significantly improved its fil...
Article
Since formalin is widely used in prevention of Saprolegnia infections in salmonid fish hatcheries, there is a need for more environmentally safe treatment methods. Therefore, we screened 360 bacterial isolates against their ability to antagonize the growth of Saprolegnia parasitica hyphae in vitro, and best strains were selected according to their...
Article
Full-text available
Effects of soybean meal (SBM) based diet on growth performance, histology of the intestinal epithelium and on the gut microbiota of juvenile rainbow trout (Oncorhynchus mykiss) were investigated on two trials lasting for 8 weeks (Trial I) and 18 weeks (Trial II). The microbiological characterization was done both with conventional plating technique...
Article
The antimicrobial effects of the wood-associated polyphenolic compounds pinosylvin, pinosylvin monomethyl ether, astringin, piceatannol, isorhapontin, isorhapontigenin, cycloXMe, dHIMP, ArX, and ArXOH were assessed against both Gram-negative (Salmonella) and Gram-positive bacteria (Listeria monocytogenes, Staphylococcus epidermidis, Staphylococcus...
Article
The aim of this study was to cluster minced meat samples temporally by different imaging systems and to study if a normal consumer digital camera can be used to evaluate the quality of minced meat during storage period. A set of minced meat samples of differing age was imaged both by spectral imaging and by RGB imaging. Spectral images were also us...
Book
Full-text available
http://sunpap.vtt.fi/pdf/SUNPAP_WP10_DEL10_5_20120827_FIOH.pdf The goal of the SUNPAP project is to proceed from research to pilot scale and finally to the end products. One of the main targets of the project is the risk assessment to guarantee the safe introduction of nanotechnologies in to the forest industry value chain. Because there are no exp...
Article
  To evaluate the antagonistic effect of Pseudomonas M162 against Flavobacterium psychrophilum.   The antagonistic activity of M162 was tested in vivo and in vitro, and its mode of action examined by siderophore production and immunological responses of rainbow trout (Oncorhynchus mykiss) fry. Pseudomonas M162 inhibited the growth of Fl. psychrophi...
Article
EFSA is requested to assess the safety of a broad range of biological agents (including microorganisms and viruses) in the context of notifications for market authorisation as sources of food and feed additives, enzymes and plant protection products. The qualified presumption of safety (QPS) assessment was developed by EFSA for its own use to provi...
Article
To study the antagonic affect of probiotic Pseudomonas M174 on the fish pathogen Flavobacterium psychrophilum. The ability of Pseudomonas M174 to inhibit the growth of Fl. psychrophilum was examined in iron-sufficient and -deficient media. Possible siderophore production was also investigated. Antagonistic activity was confirmed in disease challeng...
Article
The efficacy of weak organic acids in the control of yeasts in pig liquid feed was studied taking into account the effects on lactic acid bacteria (LAB) responsible for beneficial fermentation. The yeast population in pig liquid feed was taxonomically identified. Kazachstania exigua, Debaryomyces hansenii and Pichia deserticola dominated the fermen...
Chapter
At the turn of the 20th century the term “lactic acid bacteria” (LAB) was used to refer to “milk-souring organisms.” While similarities between milk-souring organisms and other bacteria producing lactic acid were soon observed, the monograph by Orla-Jensen (1919) formed the basis of the present classification of LAB. The criteria used by Orla-Jense...
Chapter
The definition of probiotics has evolved over a long time, and the history of probiotics is longstanding. Therefore, the exact definition has been at times difficult to reach. Probiotics have been mentioned as fermented health-promoting products during early history. Among the scientific references, Doderlein (1892) proposed the use of microorganis...
Book
While lactic acid-producing fermentation has long been used to improve the storability, palatability, and nutritive value of perishable foods, only recently have we begun to understand just why it works. Since the publication of the third edition of Lactic Acid Bacteria: Microbiological and Functional Aspects, substantial progress has been made in...
Article
Full-text available
The purpose of this paper was to check if viable bacteria, in particular lactic acid bacteria (LAB), could be enriched from biopsies obtained from healthy gastroscopy patients. Gastric biopsies were obtained from 13 gastroscopy patients and subjected to an anaerobic or microaerophilic enrichment procedure utilizing the Portable Microbe Enrichment...
Article
Full-text available
To investigate the correlations between self-reported symptoms of irritable bowel syndrome (IBS) and the gastrointestinal (GI) microbiota composition. Fecal samples were collected from a total of 44 subjects diagnosed with IBS. Their symptoms were monitored with a validated inflammatory bowel disease questionnaire adjusted for IBS patients. Thirtee...
Article
Qualified Presumption of Safety (QPS) is a generic risk assessment approach applied by the European Food Safety Authority (EFSA) to notified biological agents aiming at simplifying risk assessments across different scientific Panels and Units. The aim of this review is to outline the implementation and value of the QPS assessment for EFSA and to ex...
Article
Full-text available
In vitro toxicological tests have been proposed as an approach to complement the chemical safety assessment of food contact materials, particularly those with a complex or unknown chemical composition such as paper and board. Among the concerns raised regarding the applicability of in vitro tests are the effects of interference of the extractables...
Article
Full-text available
We aimed to determine the minimum inhibitory concentrations (MICs) of Lactobacillus rhamnosus (n=75) strains, to study their antibiotic resistance genes with microarray, and to assess the microbiological cut-off values of tested antimicrobial agents. L. rhamnosus strains were tested with agar dilution, broth microdilution and Etest methods for ampi...
Article
Full-text available
This paper describes the use of a suite of extraction procedures applicable to the assessment of the in vitro toxicity of paper/board samples intended for food-contact applications. The sample is extracted with ethanol, water, or exposed to modified polyphenylene oxide (Tenax) for fatty, non-fatty and dry food applications, respectively. The water...
Article
Full-text available
We studied the impart of rye bread and Lactobacillus rhamnosus GG supplementation on fecal/urinary mutagenicity and fecal enzyme activities in healthy subjects who consumed experimental meals containing fried meat with high mutagenic activity. Twenty-eight volunteers, mean age 39 y (range 28-58), were randomly divided into 3 intervention groups tha...
Article
Full-text available
Bu araştırma, farklı sıcaklıklarda depolanan, tuzlanmış gökkuşağı alabalıklarında (Oncorhynchus mykiss, Walbaum, 1792) Listeria monocytogenes'in oluşumunu önlemek sure-tiyle su ürünlerinin kalitesini korumayı amaçlamaktadır. Çalışma kapsamında hem fungisit hem de bakterisit olarak bilinen ve L. monocytogenes' in gelişimini engelleyen pinosylvin (3,...
Article
Full-text available
In a pilot-scale, open-label study to determine the ability of well-characterized probiotic Lactobacillus salivarius UCC118 cells to adhere to human epithelial cells in situ, the bacterial strain was administered to ulcerative colitis patients at approximately 109 CFU/day for 12 days. Microbiological analysis of biopsy specimens demonstrated that t...
Article
Full-text available
The effect of lactulose on the survival of Lactobacillus rhamnosus VTT E-97800 and on the colon microbiota and its metabolic activity was studied using the Simulator of the Human Intestinal Microbial Ecosystem (SHIME) model. L. rhamnosus VTT E-97800 and lactulose together enhanced the production of butyric acid and decreased ammonium concentration...
Article
Full-text available
Following a request from the European Commission, the European Food Safety Authority was asked to deliver a scientific opinion on the safety and efficacy of chromium methionine (Cr-Met) as feed additive for all species. Currently, trivalent chromium (Cr(III)) is not authorised as a feed additive in the EU. Therefore, the Panel on Additives and Pro...
Article
The transferability of a large plasmid that harbors a tetracycline resistance gene tet(S), to fish and human pathogens was assessed using electrotransformation and conjugation. The plasmid, originally isolated from fish intestinal Lactococcus lactis ssp. lactis KYA-7, has potent antagonistic activity against the selected recipients (Lactococcus gar...
Article
Full-text available
Coagulase-negative staphylococci (CNS) have emerged as bovine mastitis pathogens in many countries. CNS mastitis is generally mild but can persist in the udder for long periods. Pathogenesis of CNS intramammary infection is not well understood. In the present study, adhesion, invasion and intracellular replication of twenty-two CNS strains isolated...
Article
Full-text available
We aimed to determine the minimum inhibitory concentrations (MICs) of Lactobacillus rhamnosus (n=75) strains, to study their antibiotic resistance genes with microarray, and to assess the microbiological cut-off values of tested antimicrobial agents. L. rhamnosus strains were tested with agar dilution, broth microdilution and Etest methods for ampi...
Article
Fermented liquid feed has been lately much investigated in order to compensate the use of antibiotics in pig production. The fermentation process has been claimed to be the reason of the benefits associated with this type of feeding. However, contradictory results have been obtained in feeding trials due to the variable conditions in each experimen...
Article
This article summarizes published and unpublished data of antibiotic resistances in strains (n = 675) of fourteen Lactobacillus species. Minimum inhibitory concentrations (MICs) were determined against antibiotics representing different classes, namely ampicillin (penicillins), tetracycline (tetracyclines), gentamicin and streptomycin (aminoglycosi...
Article
The minimum inhibitory concentration (MIC) of ampicillin, chloramphenicol, clindamycin, erythromycin, gentamicin, streptomycin, tetracycline, and vancomycin was determined in 89 different Lactococcus lactis and in 64 Streptococcus thermophilus strains in order to establish resistance-susceptibility cut-off values in these dairy important organisms....
Article
Nineteen food contact papers and boards and one non-food contact board were extracted following test protocols developed within European Union funded project BIOSAFEPAPER. The extraction media were either hot or cold water, 95% ethanol or Tenax, according to the end use of the sample. The extractable dry matter content of the samples varied from 12...
Article
Full-text available
A comparative study of two strains of Lactobacillus plantarum (REB1 and MLBPL1) grown in commercial medium (MRS broth), cucumber juice, and liquid pig feed was performed to explore changes to the metabolic pathways of these bacteria, using a proteomics approach (two-dimensional electrophoresis and liquid chromatography-tandem mass spectrometry) com...
Article
Twenty-two strains of Streptococcus cremoris, seven strains of Streptococcus lactis and three strains of Streptococcus lactis subsp. diacetilactis, each with a different plasmid complement, were isolated from a starter culture used in a Finnish dairy plant. By using DNA-DNA hybridization, with cloned 6-P-ß-galactosidase gene of the Strep, lactis pl...
Article
BACKGROUND: Red clover (Trifolium pratense L.), a widely used fodder, has recently received considerable interest as a valuable source of isoflavones for many health-related applications. The aim of this study was to analyse the concentrations of four isoflavones, daidzein, genistein, formononetin and biochanin A, in extracts of leaves, stems, root...
Article
To examine the lactic acid bacteria flora of weaning piglets, to define the distribution of different lactobacilli species in piglet faecal samples, and to determine the susceptibility phenotype to 11 antibiotic of different families. The faecal samples were taken from piglets with good herd status at 11 and 28 days after weaning. The Lactobacillus...
Article
We investigated the cytotoxicity of reactive dyes and dyed fabrics using an in vitro hepa-1 cytotoxicity test Hepa-1-mouse cells were exposed to three monochlortriazinyl dyes: yellow, red and blue with different concentrations. The hepa-1-mouse cells were also exposed to water extracts of dyed fabrics. After 72 hours exposure, the, viability of the...
Article
Lactobacillus plantarum is a facultative heterofermentative lactic acid bacterium highly adapted to a wide variety of environments and widely used in food and feed fermentations. Proteomes of two strains of L. plantarum, one isolated from spontaneously fermented cereal-based feed (strain REB1), and the other from white cabbage (strain MLBPL1), were...
Article
In order to establish cut-off values for Lactococcus lactis to six antibiotics to distinguish susceptible and intrinsically resistant strains from those having acquired resistances, the minimum inhibitory concentration (MIC) of tetracycline, erythromycin, clindamycin, streptomycin, chloramphenicol and vancomycin was determined in 93 different Lc. l...
Article
Knotwood or bark extracts prepared from 30 species of hard and soft wood trees as well as selected pure compounds (lignans, stilbenes and flavonoids) were assayed for their antimicrobial activity against a battery of both gram positive and negative bacteria, yeasts, and filamentous fungi (Bacillus cereus, Staphylococcus aureus, Listeria monocytogen...
Article
Methylhydrazine, the main metabolite of N-methyl-N-formylhydra-zones, was detected in the cooking steam of the mushrooms False morels, Gyromitra esculenta. About 25% of the original amount of acetaldehyde-N-methyl-N-formylhydrazone was decomposed during cooking process to methylhydrazine and residues of N-methyl-N-formylhydrazine was detected as we...
Article
We investigated the effects of oral therapy with doxycycline, a tetracycline group antibiotic, on the gastrointestinal (GI) survival and tetracycline susceptibility of probiotic strains Lactobacillus acidophilus LaCH-5 and Bifidobacterium animalis subsp. lactis Bb-12. In addition, the influence of doxycycline therapy on the diversity of the predomi...
Article
Some strains of the endospore-forming bacterium Bacillus cereus produce a heat-stable ionophoric peptide, cereulide, of high human toxicity. We assessed cell toxicity of cereulide by measuring the toxicities of crude extracts of cereulide producing and non-producing strains of B. cereus, and of pure cereulide, using cells of human, animal and bacte...
Article
The aim of the present study was to investigate the intestinal survival and persistence of probiotic strains Lactobacillus F19, Lactobacillus acidophilus NCFB 1748, and Bifidobacterium animalis subsp. lactis Bb-12 consumed in a yoghurt (ABC product), and also their effect on the intestinal microbiota. Based on the results of culture studies and str...
Article
Full-text available
The aim of this study was to find sources of Listeria monocytogenes contamination in fish products from a fish farm. The occurrence of L. monocytogenes also was compared in two freshwater fish farms with different types of fishponds. Samples collected from chilled rainbow trout (Oncorhynchus mykiss) and the slaughterhouse environment did not contai...
Article
Full-text available
This study investigated the effects of a heavy resistance exercise session (RES) with the oral daytime ingestion of melatonin on the physiological responses and acute performance. In a randomized and double-blind controlled study 10 healthy male subjects undertook an 80 min intensive hypertrophic RES for major muscles of the lower and upper extremi...
Article
Seven Friesian human lactoferrin (hLf)-transgenic primiparous dairy cows expressing recombinant hLf (rhLf) in their milk were included in the study. After calving, concentrations of rhLf and bovine LF (bLf) in the milk, somatic cell count and milk yield were determined. The concentration of rhLf was found to be constant, about 2.9 mg/mL, throughout...
Article
Full-text available
An European Union (EU)-funded project QLK1-CT-2001-00930 (BIOSAFEPAPER) involves the development, validation and intercalibration of a short-term battery of toxicological tests for the safety assessment of food-contact paper and board. Dissemination of the results to industry, legislators (e.g. DG Consumer Protection, DG Enterprises, DG Research),...
Article
Ion mobility spectrometry based analysis has been found to provide a powerful and reliable tool as a portable gas detector of different chemical compounds and mixtures. The suitability of the spectrometer in food quality assay was studied in a case study, in which fish quality changes during cold storage were modelled. Hexane extracts of gills of v...
Article
This study was undertaken to compare how different conditions of transport, culture and incubation affect the concentrations of total bacteria, clostridia and Clostridium prefrigens in horse faeces. In addition, we assessed the incidence of faecal sulphite reducing clostridia and C. perfringens in healthy horses during in- and outdoor feeding seaso...
Article
The aim of this study was to investigate the frequency of enterococcal virulence factors among human intestinal Enterococcus faecalis strains and to find out whether the pattern differs from that seen in published reports on food and clinical isolates. The E. faecalis isolates were cultured from human faecal samples obtained from five ulcerative co...
Article
To investigate the survival and persistence of Lactobacillus plantarum REB1 in the fermentation process of liquid pig feed on a working farm in standard production conditions. Two feed types, a control diet [nonfermented liquid feed (NFLF)] and a fermented diet [fermented liquid feed (FLF)], were compared. A rifampicin-resistant mutant L. plantarum...
Article
Full-text available
This article reviews pertinent legislation regulating the safety of probiotics within the European Union (EU). Currently available probiotic organisms and known issues regarding their safety are briefly summarised. While most of the species and genera, particularly lactobacilli and bifidobacteria are apparently safe, certain micro-organisms may be...
Article
This viewpoint deals with regulatory aspects of microbial cultures added to foods, and primarily the lactic acid bacteria (LAB). The authors propose a number of key principles for future regulation of these cultures by the European Union. These principles are supported by brief reviews of LAB taxonomy, safety, and consumer perception. Then, a revie...
Article
Full-text available
The stability of the microbial populations in liquid piglet feed formulations was studied over a period of 3 months. Total aerobic bacteria, lactic acid bacteria, proteolytic bacteria, amylolytic bacteria, lipolytic bacteria, Bacillus cereus group and yeasts and moulds were monitored using selective media. The results demonstrated a tendency for sl...
Article
In 2000, the thematic network ENTRANSFOOD was launched to assess four different topics that are all related to the testing or assessment of food containing or produced from genetically modified organisms (GMOs). Each of the topics was linked to a European Commission (EC)-funded large shared cost action (see http://www.entransfood.com). Since the ex...