scholarly journals Detection and characterization of small-sized microplastics (≥ 5 µm) in milk products

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Paulo A. Da Costa Filho ◽  
Daniel Andrey ◽  
Bjorn Eriksen ◽  
Rafael P. Peixoto ◽  
Benoit M. Carreres ◽  
...  
Keyword(s):  
Public Interest ◽  
Dairy Products ◽  
Raw Milk ◽  
Food Group ◽  
Milk Products ◽  
Occurrence Data ◽  
Milking Machine ◽  
High Degree ◽  
First Time

AbstractMicroplastics (MPs) have gained a high degree of public interest since they are associated with the global release of plastics into the environment. Various studies have confirmed the presence of MPs throughout the food chain. However, information on the ingestion of MPs via the consumption of many commonly consumed foods like dairy products are scarce due to the lack of studies investigating the “contamination” of this food group by MPs. This lack of occurrence data is mainly due to the absence of robust analytical methods capable of reliably quantifying MPs with size < 20 µm in foods. In this work, a new methodology was developed to accurately determine and characterize MPs in milk-based products using micro-Raman (μRaman) technology, entailing combined enzymatic and chemical digestion steps. This is the first time that the presence of relatively low amounts of small-sized MP (≥ 5 µm) have been reported in raw milk collected at farm just after the milking machine and in some processed commercial liquid and powdered cow’s milk products.

Detection and Characterization of Small-Sized Microplastics (≥ 4 µm) in Milk Products

2021 ◽  
Author(s):  
Paulo A. Costa Filho ◽  
Daniel Andrey ◽  
Bjorn Ericksen ◽  
Rafael Peixoto ◽  
Benoit M. Carreres ◽  
...  
Keyword(s):  
Public Interest ◽  
Dairy Products ◽  
Raw Milk ◽  
Food Group ◽  
Milk Products ◽  
Occurrence Data ◽  
Milking Machine ◽  
High Degree ◽  
First Time

Abstract Microplastics (MPs) have gained a high degree of public interest since they are associated with the global release of plastics into the environment. As a result, MPs have also been detected along the food chain. However, information on the ingestion of MPs via the consumption of many commonly consumed foods like dairy products are scarce due to the lack of studies investigating the “contamination” of this food group by MPs. This lack of occurrence data is mainly due to the absence of robust analytical methods capable of reliably quantifying MPs with size < 20 µm in foods. In this work, we have developed a new methodology to accurately determine and characterize MPs in milk-based products using μRaman technology, entailing combined enzymatic and chemical digestion steps. We demonstrate for the first time the presence of relatively low amounts of small-sized MP (≥ 4 µm) in raw milk collected at farm just after the milking machine and in some processed commercial liquid and powdered cow’s milk products.

Characterization of SrBi2Nb2O9 Thin Films Prepared by Sol Gel Technique

1996 ◽  
Vol 459 ◽  
Author(s):  
E. Ching-Prado ◽  
W. Pérez ◽  
A. Reynés-Figueroa ◽  
R. S. Katiyar ◽  
D. Ravichandran ◽  
...  
Keyword(s):  
Thin Films ◽  
Raman Band ◽  
Sol Gel ◽  
Orthorhombic Symmetry ◽  
X Ray Diffraction ◽  
Ft Ir ◽  
Gel Technique ◽  
High Degree ◽  
First Time

ABSTRACTThin films of SrBi2Nb2O9 (SBN) with thicknesses of 0.1, 0.2, and 0.4 μ were grown by Sol-gel technique on silicon, and annealed at 650°C. The SBN films were investigated by Raman scatering for the first time. Raman spectra in some of the samples present bands around 60, 167, 196, 222, 302, 451, 560, 771, 837, and 863 cm−1, which correspond to the SBN formation. The study indicates that the films are inhomogeneous, and only in samples with thicknesses 0.4 μ the SBN material was found in some places. The prominent Raman band around 870 cm−1, which is the A1g mode of the orthorhombic symmetry, is assigned to the symmetric stretching of the NbO6 octahedrals. The frequency of this band is found to shift in different places in the same sample, as well as from sample to sample. The frequency shifts and the width of the Raman bands are discussed in term of ions in non-equilibrium positions. FT-IR spectra reveal a sharp peak at 1260 cm−1, and two broad bands around 995 and 772 cm−1. The bandwidths of the latter two bands are believed to be associated with the presence of a high degree of defects in the films. The experimental results of the SBN films are compared with those obtained in SBT (T=Ta) films. X-ray diffraction and SEM techniques are also used for the structural characterization.

Occurrence of Clostridium perfringens in Milk and Dairy Products

1980 ◽  
Vol 43 (7) ◽  
pp. 536-537 ◽  
Author(s):  
T. A. EL-BASSIONY
Keyword(s):  
Clostridium Perfringens ◽  
Dairy Products ◽  
Ice Cream ◽  
Raw Milk ◽  
Mean Value ◽  
Processed Cheese ◽  
Mean Values ◽  
Milk Products ◽  
The Mean ◽  
Milk And Dairy Products

A total of 163 samples of milk and milk products (including raw milk, Damietta and Kareish cheese, hard and processed cheese, yogurt, butter and ice cream) were collected from Assiut City markets. Clostridium perfringens was detected in 45.5, 20, 30, 14.3, 20, 10, 50 and 20% of the examined samples, respectively, using SPS agar. With TSN agar, the organism was isolated from 72.7, 20, 30, 28.6, 50, 10, 50, and 30% of the samples, respectively. The mean value of the C. perfringens count using SPS agar was 53.6/ml, 40/g, 60/g, 14.3/g, 30/g, 1.4/g, 25/g and 8/ml of raw milk, Damietta and Kareish cheese, hard and processed cheese, yogurt, butter and ice cream samples, respectively, while the mean values of C. perfringens counts obtained with TSN agar were 76.4/ml, 170/g, 140/g, 42.9/g, 590/g, 2.9/g, 172.9/g, and 109/ml of examined samples, respectively. Milk and dairy products, if improperly handled, provide a means for transmission of C. perfringens to the consumer.

scholarly journals Molecular characterization of begomoviruses and DNA satellites from Vietnam: additional evidence that the New World geminiviruses were present in the Old World prior to continental separation

2008 ◽  
Vol 89 (1) ◽  
pp. 312-326 ◽  
Author(s):  
Cuong Ha ◽  
Steven Coombs ◽  
Peter Revill ◽  
Rob Harding ◽  
Man Vu ◽  
...  
Keyword(s):  
New World ◽  
Bipartite Begomoviruses ◽  
Bipartite Begomovirus ◽  
Stem Loop ◽  
Old World ◽  
Recombinant Viruses ◽  
Virus Diversity ◽  
High Degree ◽  
First Time

Sixteen viruses, belonging to 16 species of begomovirus, that infect crops and weeds in Vietnam were identified. Sequence analysis of the complete genomes showed that nine of the viruses (six monopartite and three bipartite) belong to novel species and five of them were identified in Vietnam for the first time. Additionally, eight DNA-β and three nanovirus-like DNA-1 molecules were also found associated with some of the monopartite viruses. Five of the DNA-β molecules were novel. Importantly, a second bipartite begomovirus, Corchorus golden mosaic virus, shared several features with the previously characterized virus Corchorus yellow vein virus and with other bipartite begomoviruses from the New World, supporting the hypothesis that New World-like viruses were present in the Old World. This, together with a high degree of virus diversity that included putative recombinant viruses, satellite molecules and viruses with previously undescribed variability in the putative stem–loop sequences, suggested that South-East Asia, and Vietnam in particular, is one of the origins of begomovirus diversity.

Technological characterization of wild-typeLactococcus lactisstrains isolated from raw milk and traditional fermented milk products in Turkey

2007 ◽  
Vol 87 (6) ◽  
pp. 521-534 ◽  
Author(s):  
Burcu Özkalp ◽  
Banu Özden ◽  
Yasin Tuncer ◽  
Pınar Şanlibaba ◽  
Mustafa Akçelik
Keyword(s):  
Raw Milk ◽  
Fermented Milk ◽  
Milk Products ◽  
Fermented Milk Products

scholarly journals Coxiella burnetii DNA in milk, milk products, and fermented dairy products

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Linda Valkovska ◽  
Artjoms Mališevs ◽  
Kaspars Kovaļenko ◽  
Aivars Bērziņš ◽  
Lelde Grantiņa-Ieviņa
Keyword(s):  
Dairy Products ◽  
Q Fever ◽  
Raw Milk ◽  
Fermented Milk ◽  
Human Consumption ◽  
Diverse Range ◽  
Milk Products ◽  
Foreign Products ◽  
Fermented Dairy ◽  
Fermented Milk Products

Abstract Introduction Q fever in dairy cattle has been investigated in Latvia since 2012. In 2015, 10.7% of farms tested positive for the DNA of C. burnetii, its aetiological agent, in bulk tank milk. The presence of C. burnetii DNA and infectious bacteria in dairy products has been assessed in several countries, and because Latvian milk may contain them, parallel assessment in this country is recommended. Accordingly, the present study tested shop and farm retail dairy products from Latvia and included foreign products for comparison. Material and Methods Investigation was carried out of 187 samples of a diverse range of dairy products from 41 Latvian milk producers. Twenty-six comparable samples pooled from Estonia, France, Germany, Greece, Italy, Lithuania, the Netherlands, Poland and Spain were also included. The all-countries total number of fermented milk products was 160. Special attention was paid to products that could be more attractive to children because of their added chocolate, cacao, berry and fruit content. DNA was extracted and amplification of C. burnetii IS1111 was performed using a commercial PCR kit. Results Overall positivity was 60.56%. Domestic products were positive more often (60.96%) than foreign ones (57.69%). Only 26.67% of unpasteurised Latvian cow’s milk samples were positive whereas 76.47% of pasteurised equivalents and 63.13% of fermented milk products were. Sweetened and fruit-containing samples were 71.43% positive. Conclusion The shedding of C. burnetii via milk should be monitored and only milk from healthy animals allowed for sale for direct human consumption without pasteurisation. Raw milk quality and the effectiveness of industrial heat treatment and pasteurisation methods in Latvia and other countries should be carefully assessed to ensure adequate consumer health protection.

scholarly journals Characterization of Staphylococcus species isolated from raw milk and milk products (lben and jben) in North Morocco

2008 ◽  
Vol 2 (03) ◽  
Author(s):  
Mohammed Abid ◽  
Abdrezzak Bendahou ◽  
Mariam Lebbadi ◽  
Latifa Ennanei ◽  
Fatima Z. Essadqui
Keyword(s):  
Raw Milk ◽  
Milk Products

Isolation of exopolysaccharides producing lactic acid bacteria from dairy products

2015 ◽  
Vol 34 (4) ◽  
Author(s):  
Prasad Patil ◽  
Akanksha Wadehra ◽  
Kanchan Munjal ◽  
Pradip Behare
Keyword(s):  
Lactic Acid ◽  
Lactic Acid Bacteria ◽  
Molecular Identification ◽  
Dairy Products ◽  
Raw Milk ◽  
Fermented Milk ◽  
Milk Products ◽  
Milk Samples ◽  
Fermented Milk Products ◽  
Exopolysaccharides Production

Currently, much attention is being paid for improving the texture of food by screening the new exopolysaccharides (EPS) producing strains. The aim of the present work was to isolate EPS producing Lactic acid bacteria (LAB) strains from raw milk and milk products samples. Total of thirty eight dahi, lassi and raw milk samples were collected from different villages and towns of Karnal and Delhi District. The samples were plated on milk agar and colonies showing ropy polysaccharides production were subjected to biochemical test. After molecular identification 2 were found as <italic>S. thermophilus</italic>, 2 were <italic>Lb. rhamnosus</italic> and 2 were confirmed as <italic>Lb. fermentum</italic>. Two <italic>S. thermophilus</italic> strains (PD7 and PD11) and <italic>Lb. fermentum</italic> strains (AL6 and AD3) showed better curdling pattern, acidity, exopolysaccharides production, and sensory properties. These cultures can be used for manufacture of indigenous fermented milk products.

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