Antimicrobial stress compounds from Hypochoeris radicata

Maruta, Yoshihiko; Fukushi, Yukiharu; Ohkawa, Kaori; Nakanishi, Yuko; Tahara, Satoshi; Mizutani, Junya

doi:10.1016/0031-9422(94)00792-r

Cited by 29 publications

(14 citation statements)

References 16 publications

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“…Perhaps, secondary metabolites would be particularly synthesized after a dry weather. In fact, very few is known on H. radicata chemical composition, but some sesquiterpens and alkenals, two fungitoxins, are produced by the plant after a stress (Maruta et al., 1995). This fact adds maybe to the impossibility to reproduce the illness in the targeted animal (Seddon and Belschner, 1926; Pemberton and Caple, 1980).…”

Section: Discussionmentioning

confidence: 99%

Longitudinal study of Australian stringhalt cases in France

Domange¹,

Casteignau²,

Collignon³

et al. 2010

Journal of Animal Physiology and Animal Nutrition

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Seventy horses with clinical evidence of Australian stringhalt were studied in France from 2003 to 2008. All horses but one had history of bilateral stringhalt and grazed pastures infested with Hypochoeris radicata (L.). They displayed hind limbs hyperflexion and an abnormal gait because of a distal axonopathy with a skeletal muscle denervation and atrophy. Fifty percentage of them recovered spontaneously in 8 months, and only the more affected horses were unable to recover even if they looked healthy on dry and hot days. Clinical troubles revealed also depression or aggressive behaviour, suggesting that central nervous system might be affected. Treatment with phenytoin resulted in a rapid noticeable improvement of stringhalt in some horses but the administration of taurine seems to improve behavioural disorders. Deeply affected horses (grade III and more of Huntington's classification at the beginning) must be treated with phenytoin when the weather is muddy and damp because they still display stringhalt when they are afraid or at the beginning of the work.

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Section: Discussionmentioning

confidence: 99%

Longitudinal study of Australian stringhalt cases in France

Domange¹,

Casteignau²,

Collignon³

et al. 2010

Journal of Animal Physiology and Animal Nutrition

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“…Wound and UV-radiationinduced formation of sesquiterpenes occur in a number of plant tissues. 28 In solanaceous plants, it was demonstrated that induction of 3-hydroxy-3-methylglutarylCoA reductase (EC 1.1.1.34) is essential for the synthesis of sesquiterpenoid phytoalexins following mechanical injury or pathogen infection. Ocimene can be synthesized through photoinduced charge-transfer isomerization of α-pinene.…”

Section: Samplementioning

confidence: 99%

Storage and ultraviolet‐induced tissue stress effects on fresh‐cut pineapple

Lamikanra

Richard

2004

J Sci Food Agric

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The effect of UV-induced stress on the volatile aroma compounds in cut pineapple was compared with that of storage at 4 • C for 24 h. Eighteen volatile compounds were identified by solidphase microextraction (SPME) in fresh-cut pineapple. Methyl-2-methylbutanoate, methyl hexanoate, methyl 5-hexenoate, ethyl hexanoate and ethyl 5-hexenoate were the major aroma compounds. Storage at 4 • C for 24 h, and exposure of cut fruit to UV radiation for 15 min caused a considerable decrease in the concentration of esters and increase in the relative amount of copaene. This sesquiterpene, when added to crushed cantaloupe melon (0.1 mg g −1 ), inhibited microbial growth in the fruit over a period of 24 h at 20 • C. Cis-and trans-ocimene were present in the fruit but their production was not photo-induced by UV irradiation. Ocimene, however, was a potent antimicrobial agent that killed microorganisms when added to the crushed fruit and stored at 20 • C for 24 h. The results indicate that sesquiterpene phytoalexins could contribute to the defense mechanism in wounded pineapple tissue.

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“…The reduction and stabilization was attributed to different functional groups in various metabolites of terpenoids and reduced sugars in plant leaves. In addition, plant leaves have high levels of oxalic acid and aldehydic groups (Maruta et al, 1995), acting as both reducing agent and stabilizing ligand in NPs synthesis. Based on transmission electron microscopy (TEM) imaging, quasispherical particles were produced using leaf extract (Dwivedi and Gopal, 2010).…”

Section: B Higher Plantsmentioning

confidence: 99%

Biocatalytic Synthesis Pathways, Transformation, and Toxicity of Nanoparticles in the Environment

Dwivedi

Lena

2014

Critical Reviews in Environmental Science and Technology

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Wide application of nanoparticles (NPs) in consumer products over the last decade has increased their flux in the environment. This paper provides comprehensive review on the biocatalytic production pathways, transformations, and toxicity to human and other organisms of important NPs. Plants, algae, fungi, and bacteria have been used for energy-efficient and nontoxic biocatalytic production of NPs. The process is simple, serving as an alternative to the more popular physicochemical methods. NPs go through significant physicochemical transformation in the environment. Ionic strength, pH, and NPs' surface potential strongly influence their stability and aggregation. Their transformations are linked to their bioavailability and aging including surface coatings and dissolved organic carbon effects. In addition, nanotoxicity has been a major global concern as NPs are toxic to organisms due to their cytotoxicity and genotoxicity. The stability and transformation of NPs in environment influence their short-and long-term toxicity. Release of free metal ions, dissolution-enhanced toxicity, and direct intercalation with biological targets are studied the most. Their toxicity to ecological receptors and organisms are linked to oxidative stress by generation of reactive oxygen species. Moreover, NPs toxicity depends on their physicochemical alterations. Inherent and acquired properties have potential to alter toxicity of NPs. Thus achieving safe nanotechnology and minimizing their adverse impact is important to protect the health of humans as well as the environment.

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Antimicrobial stress compounds from Hypochoeris radicata

Cited by 29 publications

References 16 publications

Longitudinal study of Australian stringhalt cases in France

Longitudinal study of Australian stringhalt cases in France

Storage and ultraviolet‐induced tissue stress effects on fresh‐cut pineapple

Biocatalytic Synthesis Pathways, Transformation, and Toxicity of Nanoparticles in the Environment

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