• Title/Summary/Keyword: Volatile fatty acids

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Determination of Volatile Fatty Acids in Aqueous Samples by HS-SPME with In-Fiber Derivatization (Fiber내 유도체화/HS-SPME를 이용한 수용액 시료 중 휘발성 지방산의 분석)

  • Ahn, Yun Gyong;Lee, Jee Yeon;Kim, Jeehyeong;Hong, Jongki
    • Analytical Science and Technology
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    • v.16 no.6
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    • pp.458-465
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    • 2003
  • The HS (headspace)-SPME (Solid phase microextraction) as rapid and simple method was performed for the determination of volatile fatty acids (VFAs) from the aqueous samples. In-fiber derivatization of VFAs with 1-Pyrenyldiazomethane (PDAM) was applied to improve their sensitivity of detection. In SPME procedure, typical parameters such as effects of solution pH, and salting out reagent and ultrasonication were investigated to improve the extraction efficiency. Based on the developed method, VFAs in wastewater samples were determined by gas chromatography / mass spectrometry-selected ion monitoring (GC/MS-SIM) mode.

Performance and Microbial Characteristics of Bio-hydrogen Production from Food Waste with Thermal Pre-treatment (음식물류 폐기물의 혐기성 수소 발효 시 열처리에 따른 성능 및 미생물 특성 평가)

  • Lee, Chaeyoung;Choi, Jaemin
    • Journal of Hydrogen and New Energy
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    • v.25 no.1
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    • pp.11-18
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    • 2014
  • This study was conducted to investigate the effect of thermal pre-treatment on bio-hydrogen from food waste. Two continuous reactors operated and VFAs(volatile fatty acids) production and microbial communities were analyzed. The average hydrogen yield was 0.50 and 0.33mol $H_2/mol$ $hexose_{added}$ in thermally treated food added reactor(R1) and control(R2), respectively. Butyrate concentration was similarly 7,500mg/L in both reactors, but two times higher lactate concentration was observed in R2(3,800mg/L). The results of FISH(fluorescence in situ hybridization) showed that the relative microorganism to hydrogen producing bacteria was 78 and 27% in R1 and R2, respectively.

Evaluation of Characterization During Start-up of Anaerobic Digestion Via Various Seeding Methods (음식물류 폐기물의 혐기성 소화 시 식종 방법에 따른 start-up 특성 평가)

  • LEE, CHAE-YOUNG;HAN, SUN-KEE
    • Journal of Hydrogen and New Energy
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    • v.27 no.5
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    • pp.533-539
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    • 2016
  • This study was performed to evaluate the characteristics of start-up of anaerobic digestion from food waste with different inoculum ratios. The hydrogen yield was similar with different inoculum ratios. The hydrogen production rate increased with increasing inoculum ratio. But the specific hydrogen production rate decreased with increasing inoculum ratio. Total volatile fatty acids composition analysis showed that butyrate and acetate were the prevalent products in all reactors, followed by lactate and propionate. The acetate was most prevalent product in reactors at $X_0/S_0=0.080$ and 0.159. But in reactors at $X_0/S_0=0.239$ and 0.318, butyrate accounted for greater than 50% of the total volatile fatty acids.

Characteristics of Electricity Production from Volatile Fatty Acids Using a Microbial Fuel Cell (미생물연료전자를 이용한 유기산으로부터 전기생산 특성)

  • Noh, Jung-bin;Hwang, Yong-woo;Bae, Jae-ho;Moon, Jin-young
    • Journal of Korean Society of Water and Wastewater
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    • v.20 no.2
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    • pp.225-234
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    • 2006
  • Characteristics of electricity production from major fermentation products (acetate, propionate and butyrate) were evaluated in a microbial fuel cell (MFC). For each substrate, batch and continuous experiments were performed. The batch test result indicated that coulombic efficiency depended on the resistance connected in MFC circuit. With acetate, coulombic efficiency were 87% at $20{\Omega}$, but decreaced to 45% at$220{\Omega}$. In continuous tests, maximum power densities obtained was 220 Q with acetate. The maximum power densities of butyrate, acetate and propionate were 6.8, 6.1, and $5.2mW/m^2$, respectively. Propionate and butyrate were converted into acetate producing high currents. $H_2$ produced during butyrate and propionate probably used to produce electricity. In conclusion, butyrate conversion into acetate was faster than that of propionate with higher electricity production. If the production of propionate is inhibited during fermentation, anaerobically fermented liguor may be effectively applied for MFC.

Effects of Dietary Amino Acid Additives to Weaned Piglet Diets on pH and Volatile Fatty Acids of Pig Slurry (이유자돈 사료에 아미노산 첨가제가 돈분 슬러리의 pH와 휘발성지방산에 미치는 영향)

  • Chang-Man, Kim
    • Journal of Environmental Science International
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    • v.32 no.3
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    • pp.191-195
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    • 2023
  • This study aimed to investigate the effect of amino acid additives to weaned piglet diets on the pH and volatile fatty acids of pig slurries. A total of 135 weaned 22 -day-old piglets (Yorkshire x Landrace x Duroc) were used in this 56-d study. The three dietary treatments were as follows: (1) Control as a basal diet, (2) 1% amino acid additive and (3) 2% amino acid additive. Both pH and acetic acid values at 71 and 78 days were significantly different in all treatment groups (p<0.05). In addition, significant differences in propionic acid values were observed among treatment groups at 64 and 78 days (p<0.05). However, pH, acetic acid, and propionic acid values did not differ between 1% and 2% amino acid treatment groups. In conclusion, adding 1% and 2% amino acid to weaned piglet diets reduced the pH, acetic acid and propionic acid contents of pig slurries by acting as a probiotic. This may help formulate increase management strategies for improving the pig housing environment.

Comparison of reducing sugar content, sensory traits, and fatty acids and volatile compound profiles of the longissimus thoracis among Korean cattle, Holsteins, and Angus steers

  • Piao, Min Yu;Lee, Hyun Jung;Yong, Hae In;Beak, Seok-Hyeon;Kim, Hyun Jin;Jo, Cheorun;Wiryawan, Komang Gede;Baik, Myunggi
    • Asian-Australasian Journal of Animal Sciences
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    • v.32 no.1
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    • pp.126-136
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    • 2019
  • Objective: This study was performed to compare fat content, reducing sugar contents, sensory traits, and fatty acid (FA) and volatile compound profiles in longissimus thoracis (LT) among Korean cattle (KC), Holstein (HO), and Angus (AN) steers. Methods: Twelve LT samples (about 500 g each) of KC with an average age of $31{\pm}0.42months$, an average carcass weight of $431{\pm}12.5kg$, and a quality grade (QG) of 1+ were obtained from the joint livestock products market. Twelve LT samples of HO cattle with an average age of $24{\pm}0.54months$, an average carcass weight of $402{\pm}7.81kg$, and a QG of 2 were also obtained from the same market. Twelve LT samples of AN steers with an average age of about 20 months and a QG of choice were purchased from a beef delivery company. After slaughter, samples were kept at $4^{\circ}C$ for 42 days and prepared for immediate analysis or stored at appropriate conditions. The chemical composition, color, pH, shear force, collagen content, reducing sugars, sensory evaluation, FA composition, and volatile compound content for each LT sample were analyzed. Results: The LT of KC had the highest (p<0.05) fat content, the highest reducing sugar content, and the highest scores in the sensory evaluation (flavor, tenderness, juiciness, and overall acceptance). All the sensory traits were positively correlated (p<0.001) with intramuscular fat and reducing sugar content. Several FAs and volatile compound profiles varied among the breeds. KC LT had the highest (p<0.05) concentrations of acetaldehyde, 3-methyl butanal, and 3-hydroxy-2-butanone, and these volatile compounds were positively correlated (p<0.05) with all the sensory traits. Conclusion: Variations in fat content and reducing sugar contents and FA and volatile compound profiles may contribute to differences in the sensory quality of LT among breeds.

Fermentation of Environmental Friend Total Mixed Ration and Alteration of Rumen Fermentation Characteristics (환경친화적 섬유질 배합사료의 발효와 반추위 발효특성 변화)

  • Ryu, Chae-Hwa;Park, Myung-Sun;Park, Chul;Choi, Nag-Jin;Cho, Sang-Buem
    • Korean Journal of Organic Agriculture
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    • v.25 no.2
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    • pp.461-473
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    • 2017
  • Total mixed ration (TMR) including concentrate diet and roughage together have been used for the ruminant animal. Relatively high concentrations of moisture and water soluble carbohydrate are representative feature of TMR. Those moisture and water can also provide a niche for bacterial growth. Therefore, a possible fermentation of TMR induced by micro-organism is generally accepted. The present study hypothesized that different lactic acid bacteria could alter fermentation of TMR and subsequently rumen fermentation. Three lactic acid bacteria, Lactobacillus paracasei (A), L. plantarum (B) and L. parabuchneri (C), were employed and 7 treatments under full factorial design were compared with control without inoculation. TMR for dairy cow was used. Significant alterations by treatments were detected at lactic acid and butyric acid contents in TMR (p<0.05). Treatment AC (mixture of A and C) and BC (mixture of B and C) showed great lactate production. Great butyrate production was found at treatment C. At in vitro rumen fermentation, treatments B, C and AB (mixture of A and B) showed significantly great total gas production (p<0.05). All treatments except treatments B and AB, showed less dry matter digestibility, significantly (p<0.05). Total volatile fatty acid production at treatment AC was significantly greater than others (p<0.05). In individual volatile fatty acid production, treatment AB and AC showed great acetate and propionate productions, significantly (p<0.05). This study investigated correlation between organic acid production in TMR and rumen volatile fatty acid production. And it was found that butyric acid in TMR had significant negative correlation with acetate, propionate, total volatile fatty acid, AP ratio and dry matter digestibility.

The Comparison of Concentration of Volatile Fatty Acids, Ammonia, and Volatile Organic Compounds in Pig Slurry (돈사 종류별 슬러리의 악취물질 농도 비교)

  • Cho, Sung Back;Yang, Seung Hak;Lee, Jun Yeop;Kim, Jung Kon;Jeon, Jung Hwan;Han, Man Hee;Han, Duck Woo;Jeong, Gwang Hwa;Kwag, Jeong Hoon;Choi, Dong Yun;Hwang, Ok Hwa
    • Journal of Animal Environmental Science
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    • v.19 no.1
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    • pp.25-32
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    • 2013
  • This study was performed to analyse the concentration of odorous compounds in the piggeries. Piggeries for different types of pigs include piglets, growing pigs, gestating and lactating sows. Slurry from these piggeries was sampled every month for chemical analysis. Short chain fatty acid (SCFA) was 9,862 ppm (piglet), 8,410 ppm (growing pigs), 6,791 ppm (fattening pigs), 3,508 ppm (lactating sows) and 1,687 ppm (gestating sows). Branched chain fatty acid (BCFA) was 1,634 ppm (piglet), 1,206 ppm (growing pigs), 868 ppm (fattening pigs), 493 ppm (lactating sows) and 185 ppm (gestating sows). Concentration of phenols was 209 ppm (piglet), 166 ppm (growing pigs), 127 ppm (fattening pigs), 85 ppm (lactating sows) and 36 ppm (gestating sows). Indoles was 18 ppm (piglet), 14 ppm (growing pigs), 8 ppm (fattening pigs), 6 ppm (lactating sows) and 4 ppm (gestating sows). Altogether, concentration of odorous compounds was decreased as pigs got aged.

Pyrolysis/GC-Mass Spectrometry Analysis for Rapid Identification of Volatile Flavour Compounds of Accelerated Ripened Cheddar Cheese and Enzyme-Modified Cheese (단기숙성치즈 및 EMC 치즈의 휘발성 풍미성분 신속분석방법으로서 Pyrolysis/GC-Mass Spectrometry의 이용)

  • ;;;S.S.B. Haileselassie;V.A. Yaylayan;B.H. Lee
    • Food Science of Animal Resources
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    • v.21 no.3
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    • pp.256-264
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    • 2001
  • Pyrolysis/GC-mass spectrometry(Hewlet-Packard 5890GC/mass selective detector, 5971 BMSD), interfaced to a CDS Pyroprobe 1500 was optimized for rapid analysis of flavour compounds in Cheddar cheese. Twenty flavour compounds, including aldehydes(4), ketones(4), fatty acids(10), alcohol(1), and hydrocarbon(1), were identified from Cheddar cheeses. In total, Twenty-three flavour compounds aldehydes(2), ketones(8), alcohols(3), fatty acids(7), lactone(1), benzene derivative(1) and amide(1) were identified from two samples of accelerated-ripened Cheddar cheese treated with the proteolytic enzymes of Lactobacillus casei LGY. In total, Twenty-one flavour compounds; aldehydes(2), ketones(5), alcohols(2), fatty acids(11), and lactone(1) were identified from enzyme-modified cheese(EMC) treated with the combination of the proteolytic enzymes of Lactobacillus casei LGY and commercial endopeptidase or lipase. However, All the flavour compounds identified by pyrolysis/GC/MS in samples of ARC and EMC were not determined whether they are recognized as typical Cheddar flavour or not. More studies were requested on the development of methods for a rapid and convienent analysis of dairy fermented products using pyrolysis/GC-mass spectrometry.

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Effects of ruminal administration of soy sauce oil on functional fatty acids in the rumen, blood and milk of dairy cows

  • Konno, Daiji;Takahashi, Masanobu;Osaka, Ikuo;Orihashi, Takenori;Sakai, Kiyotaka;Sera, Kenji;Obara, Yoshiaki;Kobayashi, Yasuo
    • Animal Bioscience
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    • v.34 no.1
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    • pp.66-73
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    • 2021
  • Objective: Soy sauce oil, a byproduct of whole soybean processing by the soy sauce industry, was evaluated as a source of linoleic acid for dairy cows for the purpose of manipulating the composition of milk. Methods: Eight dairy Holstein cows fitted with rumen cannulas were used for ruminal administration of soy sauce oil for a 28-day period using a 4×4 Latin square study design with 4 doses (0, 200, 400, and 600 g soy sauce oil/d). Results: Although dry matter intake and milk yield were not affected by soy sauce oil administration, ruminal concentrations of total volatile fatty acids and acetate were decreased, specifically at 600 g/d administration. While milk fat percentage was decreased with administration of soy sauce oil, proportions of linoleic, vaccenic and conjugated linoleic acids in the rumen, blood and milk were increased with increasing soy sauce oil dose. Conclusion: These results suggest that soy sauce oil feeding could be useful for improving milk functionality without adverse effects on animal production performance when fed at less than 400 g/d.