scholarly journals Assessment of Growth and Technological Performances of Yogurt Bacteria Isolated From Local Turkish Yogurts

2021 ◽  
pp. 38-50
Author(s):  
Irem Uzunsoy ◽  
Sebnem Ozturkoglu Budak ◽  
Tuba Sanli ◽  
Birce Taban ◽  
Aykut Aytac ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Rural Areas ◽  
Streptococcus Thermophilus ◽  
Growth Patterns ◽  
Lactobacillus Delbrueckii ◽  
Volatile Organic ◽  
Sensory Evaluations ◽  
Commercial Applications ◽  
Lactobacillus Delbrueckii Subsp

Growth patterns and some technological performances of five Streptococcus thermophilus and seven Lactobacillus delbrueckii subsp. bulgaricus strains isolated from yogurt samples which were collected from remote rural areas of Anatolia, Turkey were assessed. The single isolates were screened for milk acidification performances, production of volatile organic compounds and texture developing properties, and selected isolates were combined to use in yogurt-making. Yogurt samples were subjected to sensory evaluations as well as fermentation profiles. Finally, the combinations of one Streptococcus thermophilus isolate with all Lactobacillus delbrueckii subsp. bulgaricus strains were found to have potentials for further evaluations regarding their suitability for commercial applications.

scholarly journals Different Fecal Microbiotas and Volatile Organic Compounds in Treated and Untreated Children with Celiac Disease

2009 ◽  
Vol 75 (12) ◽  
pp. 3963-3971 ◽  
Author(s):  
Raffaella Di Cagno ◽  
Carlo G. Rizzello ◽  
Francesca Gagliardi ◽  
Patrizia Ricciuti ◽  
Maurice Ndagijimana ◽  
...  
Keyword(s):  
Celiac Disease ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Solid Phase ◽  
Lactobacillus Delbrueckii ◽  
Rrna Gene ◽  
Healthy Children ◽  
Fecal Samples ◽  
Dgge Analysis ◽  
Volatile Organic

ABSTRACTThis study aimed at investigating the fecal microbiotas of children with celiac disease (CD) before (U-CD) and after (T-CD) they were fed a gluten-free diet and of healthy children (HC). Brothers or sisters of T-CD were enrolled as HC. Each group consisted of seven children. PCR-denaturing gradient gel electrophoresis (DGGE) analysis with V3 universal primers revealed a unique profile for each fecal sample. PCR-DGGE analysis with group- or genus-specific 16S rRNA gene primers showed that theLactobacilluscommunity of U-CD changed significantly, while the diversity of theLactobacilluscommunity of T-CD was quite comparable to that of HC. Compared to HC, the ratio of cultivable lactic acid bacteria andBifidobacteriumtoBacteroidesand enterobacteria was lower in T-CD and even lower in U-CD. The percentages of strains identified as lactobacilli differed as follows: HC (ca. 38%) > T-CD (ca. 17%) > U-CD (ca. 10%).Lactobacillus brevis,Lactobacillus rossiae, andLactobacillus pentosuswere identified only in fecal samples from T-CD and HC.Lactobacillus fermentum,Lactobacillus delbrueckiisubsp.bulgaricus, andLactobacillus gasseriwere identified only in several fecal samples from HC. Compared to HC, the composition ofBifidobacteriumspecies of T-CD varied, and it varied even more for U-CD. Forty-seven volatile organic compounds (VOCs) belonging to different chemical classes were identified using gas-chromatography mass spectrometry-solid-phase microextraction analysis. The median concentrations varied markedly for HC, T-CD, and U-CD. Overall, ther2values for VOC data for brothers and sisters were equal to or lower than those for unrelated HC and T-CD. This study shows the effect of CD pathology on the fecal microbiotas of children.

scholarly journals Determinants of airborne concentrations of volatile organic compounds in rural areas of Western Canada

2007 ◽  
Vol 18 (2) ◽  
pp. 117-128 ◽  
Author(s):  
Xiaoqing You ◽  
Ambikaipakan Senthilselvan ◽  
Nicola M Cherry ◽  
Hyan G-MI Kim ◽  
Igor Burstyn
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Rural Areas ◽  
Western Canada ◽  
Volatile Organic

scholarly journals Characteristics and Sources of Selected Halocarbon and Hydrocarbon Volatile Organic Compounds in Surface Water of the Han River Basin

Water ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 2568
Author(s):  
Jong Kwon Im ◽  
Sujin Kim ◽  
Young Seuk Kim ◽  
Hye Ran Noh ◽  
Young-Min Lee ◽  
...  
Keyword(s):  
Surface Water ◽  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Rural Areas ◽  
Total Concentration ◽  
Average Concentration ◽  
Gas Chromatography Mass Spectrometry ◽  
Han River ◽  
Detection Frequency ◽  
Volatile Organic

Volatile organic compounds (VOCs) are ubiquitous pollutants in surface water, which is the main source of drinking water in South Korea. We investigated the behavior (concentration, distribution, and environmental risk) of eleven selected VOCs in the surface water of the Han River tributaries using purge-and-trap gas chromatography/mass spectrometry. The average concentration of VOCs was 0.29 ± 0.47 μg/L. Chloroform and trichloroethylene (TCE) were the major pollutants, accounting for approximately 64.2% and 25.6% of the total concentration, respectively, and showing that halocarbons accounted for 94%. Chloroform was positively correlated with TCE and xylenes, and TCE was positively correlated with tetrachloroethylene (PCE). No differences were observed in the temporal average concentrations of total VOCs, but the concentrations differed significantly among sub-watershed areas. The Imjin-Hantan River, Han River mainstream, and Anseong Stream watersheds had a high positive association with TCE, whereas the Bukhan and Namhan River watersheds had a strong positive link with chloroform. The contamination and detection frequency of VOCs were highest in industrial complexes, followed by urban and rural areas. Thus, point source pollution significantly contributed to VOC contamination of these tributaries. Risk quotients for most VOCs were <1, suggesting negligible risk. Considering the relatively high occurrence of VOCs and their potential ecological risks, continuous environmental monitoring and study of environmental impacts based on ecotoxicity studies of domestic aquatic species are warranted.

scholarly journals Volatile organic compounds in the western Mediterranean basin: urban and rural winter measurements during the DAURE campaign

2013 ◽  
Vol 13 (8) ◽  
pp. 4291-4306 ◽  
Author(s):  
R. Seco ◽  
J. Peñuelas ◽  
I. Filella ◽  
J. Llusia ◽  
S. Schallhart ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Rural Areas ◽  
Sea Breeze ◽  
Rural Site ◽  
Urban Site ◽  
Mixing Ratios ◽  
Western Mediterranean Basin ◽  
Volatile Organic ◽  
Urban Rural

Abstract. Atmospheric volatile organic compounds (VOCs) have key environmental and biological roles, but little is known about the daily VOC mixing ratios in Mediterranean urban and natural environments. We measured VOC mixing ratios concurrently at an urban and a rural site during the winter DAURE campaign in the northeastern Iberian Peninsula, by means of PTR-MS at both locations: a PTR-Quad-MS at the urban site and a PTR-ToF-MS at the rural site. All VOC mixing ratios measured were higher at the urban site (e.g. acetaldehyde, isoprene, benzene, and toluene with averages up to 1.68, 0.31, 0.58 and 2.71 ppbv, respectively), with the exception of some short-chain oxygenated VOCs such as acetone (with similar averages of 0.7–1.6 ppbv at both sites). The average diurnal pattern also differed between the sites. Most of the VOCs at the urban location showed their highest mixing ratios in the morning and evening. These peaks coincided with traffic during rush hour, the main origin of most of the VOCs analyzed. Between these two peaks, the sea breeze transported the urban air inland, thus helping to lower the VOC loading at the urban site. At the rural site, most of the measured VOCs were advected by the midday sea breeze, yielding the highest daily VOC mixing ratios (e.g. acetaldehyde, isoprene, benzene, and toluene with averages up to 0.65, 0.07, 0.19, and 0.41 ppbv, respectively). Only biogenic monoterpenes showed a clear local origin at this site. In addition, the concentrations of fine particulate matter observed at both sites, together with the synoptic meteorological conditions and radio-sounding data, allowed the identification of different atmospheric scenarios that had a clear influence on the measured VOC mixing ratios. These results highlight the differences and relationships in VOC mixing ratios between nearby urban and rural areas in Mediterranean regions. Further research in other urban-rural areas is warranted to better understand the urban-rural influence on atmospheric VOC mixing ratios under different atmospheric conditions.

scholarly journals Volatile organic compounds in the Western Mediterranean Basin: urban and rural winter measurements during the DAURE campaign

2012 ◽  
Vol 12 (11) ◽  
pp. 30909-30950 ◽  
Author(s):  
R. Seco ◽  
J. Peñuelas ◽  
I. Filella ◽  
J. Llusia ◽  
S. Schallhart ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Rural Areas ◽  
Sea Breeze ◽  
Rural Site ◽  
Urban Site ◽  
Mixing Ratios ◽  
Western Mediterranean Basin ◽  
Volatile Organic ◽  
Urban Rural

Abstract. Atmospheric volatile organic compounds (VOCs) have key environmental and biological roles, but little is known about the daily VOC mixing ratios in Mediterranean urban and natural environments. We measured VOC mixing ratios concurrently at an urban and a rural site during the winter DAURE campaign in the northeastern Iberian Peninsula. All VOC mixing ratios measured were higher at the urban site (e.g. acetaldehyde, isoprene, benzene, and toluene with averages up to 1.68, 0.31, 0.58 and 2.71 ppbv, respectively), with the exception of some short chain oxygenated VOCs such as acetone (with similar averages of 0.7–1.6 ppbv at both sites). Their average diurnal pattern also differed between the sites. Most of the VOCs at the urban location showed their highest mixing ratios in the morning and evening. These peaks coincided with traffic during rush hours, the main origin of most of the VOCs analyzed. Between these two peaks, the sea breeze transported the urban air inland, thus helping to lower the VOC loading at the urban site. At the rural site, most of the measured VOCs were advected by the midday sea breeze, yielding the highest daily VOC mixing ratios (e.g. acetaldehyde, isoprene, benzene, and toluene with averages up to 0.65, 0.07, 0.19, and 0.41 ppbv, respectively). Only biogenic monoterpenes showed a clear local origin at this site. In addition, the concentrations of fine particulate matter observed at both sites, together with the synoptic meteorological conditions and radio-sounding data, allowed the identification of different atmospheric scenarios that had a clear influence on the measured VOC mixing ratios. These results highlight the differences and relationships in VOC mixing ratios between nearby urban and rural areas in Mediterranean regions. Further research in other urban-rural areas is warranted to better understand the urban-rural influence on atmospheric VOC mixing ratios under different atmospheric conditions.

scholarly journals Spatiotemporal variation, sources, and secondary transformation potential of volatile organic compounds in Xi'an, China

2021 ◽  
Vol 21 (6) ◽  
pp. 4939-4958
Author(s):  
Mengdi Song ◽  
Xin Li ◽  
Suding Yang ◽  
Xuena Yu ◽  
Songxiu Zhou ◽  
...  
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Rural Areas ◽  
Urban Areas ◽  
Dominant Role ◽  
Sampling Site ◽  
Vehicle Exhaust ◽  
Industrial Emissions ◽  
Volatile Organic ◽  
Transformation Potential

Abstract. As critical precursors of ozone (O3) and secondary organic aerosols, volatile organic compounds (VOCs) play a vital role in air quality, human health, and climate change. In this study, a campaign of comprehensive field observations and VOC grid sampling was conducted in Xi'an, China, from 20 June to 20 July 2019 to identify the spatiotemporal concentration levels, sources, and secondary transformation potential of VOCs. During the observation period, the average VOC concentrations at the Chanba (CB), Di Huan Suo (DHS), Qinling (QL), and gridded sampling sites were 27.8 ± 8.9, 33.8 ± 10.5, 15.5 ± 5.8, and 29.1 ± 8.4 ppb, respectively. Vehicle exhaust was the primary source of VOC emissions in Xi'an, and the contributions of vehicle exhaust to VOCs at the CB, DHS, and QL sites were 41.3 %, 30.6 %, and 23.6 %–41.4 %, respectively. While industrial emissions were the second-largest source of VOCs in urban areas, contributions from aging sources were high in rural areas. High potential source contribution function values primarily appeared in eastern and southern Xi'an near the sampling site, which indicates that Xi'an exhibits a strong local VOC source. Moreover, alkenes, aromatics, and oxygenated VOCs played a dominant role in secondary transformation, which is a major concern in reducing O3 pollution in Xi'an.

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