Thermal stability of fatty acids in subcritical water

Shin, Hee‐Yong; Ryu, Jae-Hun; Park, Sang-Yeob; Bae, Seung Yong

doi:10.1016/j.jaap.2012.08.003

Cited by 46 publications

(20 citation statements)

References 15 publications

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“…The active substances produced by PN appear to be heatstable up to 120°C. Furthermore, linoleic acid, a major fraction of chlorellin, as well as other FAs, were found to be stable at a temperature of 300°C or below (Shin et al 2012).…”

Section: Discussionmentioning

confidence: 99%

Effect of green alga Planktochlorella nurekis on selected bacteria revealed antibacterial activity in vitro

Čermák¹,

Pražáková²,

Marounek³

et al. 2015

CZECH J ANIM SCI

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ABSTRACT:The green alga Planktochlorella nurekis (Chlorellaceae, Chlorophyta) is considered a producer of antibacterial mixture of long-chain fatty acids, which has possibly similar composition and mode of action as chlorellin produced by another green alga, Chlorella vulgaris. Although the antibacterial properties of C. vulgaris have been reported, the interactions of P. nurekis with bacteria have not been determined yet. The aim of this study was to elucidate the effect of P. nurekis water suspension on growth of selected gastrointestinal bacteria in vitro so that it could be used as a suitable feed supplement in animal farming. Unknown bacterial populations occurring in the algal suspension were identified using 16S rRNA sequencing assay. Selected strains were cultivated with lyophilized P. nurekis and the antibacterial effect was monitored. The composition of fatty acids and heat sensitivity of antibacterial substances were also examined. Sequencing analysis of 71 bacterial 16S rRNA genes in xenic algal suspension identified common environmental microbiota, one strain belonging to the class Alphaproteobacteria, 17 to Betaproteobacteria, 44 to Gammaproteobacteria (dominated by Pseudomonas putida strains), and nine to Sphingobacteria. The antimicrobial activity of P. nurekis suspension was tested at a concentration range of 0.75-6 mg/ml. The highest inhibitory effect was observed on bifidobacteria. Statistically significant reductions in bacterial counts were also observed for Escherichia coli, Salmonella enterica var. Enteritidis, S. enterica var. Infantis, Campylobacter jejuni, and Arcobacter butzleri. The growth of Lactobacillus johnsonii was significantly stimulated. The relative proportions of C14-C22 fatty acids in P. nurekis were found as follows: saturated 54.28%, monounsaturated 30.40%, and polyunsaturated 7.16%. The antibacterial compounds present in P. nurekis suspension exhibited thermostability. The results indicate that P. nurekis can inhibit some pathogenic gastrointestinal bacteria and seems to be a promising essential nutrients source in animal nutrition.

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Section: Discussionmentioning

confidence: 99%

Effect of green alga Planktochlorella nurekis on selected bacteria revealed antibacterial activity in vitro

Čermák¹,

Pražáková²,

Marounek³

et al. 2015

CZECH J ANIM SCI

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“…To minimize thermal degradation of biodiesel, Imahara et al [4] suggested that the supercritical methanol method should be carried out at temperature below 300 8C, preferably at 270 8C, with a pressure higher than 8.09 MPa. Shin et al [5] reported that degradation of unsaturated fatty acids, found in vegetable oils in the presence of water, was observed at temperatures above 250 8C with an operating pressure of 20 MPa. Different co-solvents, propane [6], heptane [7] and carbon dioxide [8] have been used to lower temperature to 280 8C in the supercritical methanol method.…”

Section: Introductionmentioning

confidence: 99%

In situ transesterification of Jatropha curcas L. seeds in subcritical solvent system

Sutanto

Liu

et al. 2014

Journal of the Taiwan Institute of Chemical Engineers

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“…As previously, the figure of soybean and jatropha oils are not shown as they are relatively similar to sunflower oil and palm oil respectively. shown in previous studies [19,26]. Fujii et al [27] demonstrated that fatty acids commonly only start to degrade above 300 °C.…”

Section: Effect Of Htl Temperature On Oil Compositionmentioning

confidence: 78%

“…The type of isomer present also effects the direction of the reaction, for instance the breakdown of the cis-form of oleic acid produces undecene and the trans-form produces heptanoic acid [26]. Mono substituted aromatic compounds are also formed by endocyclization and di-substituted aromatics can also be formed by exo-cyclization such as 1-ethyl-2-methyl-benzene which is formed by the cyclization of nonene [34,35].…”

Section: Discussionmentioning

confidence: 99%

Catalytic hydrothermal processing of lipids using metal doped zeolites

Robin

Jones

Ross

2017

Biomass and Bioenergy

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Article:Robin, T, Jones, JM orcid.org/0000-0001-8687-9869 and Ross, AB (2017) Catalytic hydrothermal processing of lipids using metal doped zeolites. Biomass and Bioenergy, ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. Catalytic hydrothermal processing of lipids using metal doped zeolites

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Thermal stability of fatty acids in subcritical water

Cited by 46 publications

References 15 publications

Effect of green alga Planktochlorella nurekis on selected bacteria revealed antibacterial activity in vitro

Effect of green alga Planktochlorella nurekis on selected bacteria revealed antibacterial activity in vitro

In situ transesterification of Jatropha curcas L. seeds in subcritical solvent system

Catalytic hydrothermal processing of lipids using metal doped zeolites

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