Influence of microwave radiation on free Candida antarctica lipase B activity and stability.

Organic & biomolecular chemistry · 2006 · Mixed · Low evidence

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MixedLow evidencePaper 6437

Study snapshot

PublicationOrganic & biomolecular chemistry · 2006

Study typein_vitro

Reported directionMixed

Evidence ratingLow

Abstract

The influence of microwave heating on free Candida antarctica lipase B activity and stability was studied over the temperature range from 40 to 110 degrees C. Concerning the lipase activity, identical initial rate and conversion yield were obtained under microwave radiation and classical thermal heating for the alcoholysis between ethyl butyrate and butanol in a solvent-free system. On the other hand, the kinetics of the free lipase inactivation in butanol appears to be influenced by the heating mode. The Arrhenius plot obtained under classical heating was linear over all the temperature range studied whereas a biphasic Arrhenius plot was obtained under microwaves. The non-classical effect of the microwave heating on the initial rate of the enzymatic inactivation was thus dependent on the temperature of incubation.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typein_vitro

Effect directionmixed

PopulationNot supplied

Sample sizeNot supplied

Exposuremicrowave

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

For alcoholysis between ethyl butyrate and butanol (solvent-free), identical initial rate and conversion yield were observed under microwave radiation and classical thermal heating. In contrast, lipase inactivation kinetics in butanol differed by heating mode: the Arrhenius plot was linear under classical heating but biphasic under microwaves, indicating a temperature-dependent non-classical effect on the initial rate of enzymatic inactivation.

Outcomes measured

Candida antarctica lipase B activity (initial rate, conversion yield)
Lipase stability/inactivation kinetics in butanol
Arrhenius plot characteristics under different heating modes

Limitations

Microwave exposure parameters (e.g., frequency, power, SAR) not reported in the abstract
In vitro enzyme system; no human/animal health outcomes
Details on experimental design and replication/sample size not provided in the abstract

View raw extracted JSON

{
  "study_type": "in_vitro",
  "exposure": {
    "band": "microwave",
    "source": "microwave heating",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": null
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "Candida antarctica lipase B activity (initial rate, conversion yield)",
    "Lipase stability/inactivation kinetics in butanol",
    "Arrhenius plot characteristics under different heating modes"
  ],
  "main_findings": "For alcoholysis between ethyl butyrate and butanol (solvent-free), identical initial rate and conversion yield were observed under microwave radiation and classical thermal heating. In contrast, lipase inactivation kinetics in butanol differed by heating mode: the Arrhenius plot was linear under classical heating but biphasic under microwaves, indicating a temperature-dependent non-classical effect on the initial rate of enzymatic inactivation.",
  "effect_direction": "mixed",
  "limitations": [
    "Microwave exposure parameters (e.g., frequency, power, SAR) not reported in the abstract",
    "In vitro enzyme system; no human/animal health outcomes",
    "Details on experimental design and replication/sample size not provided in the abstract"
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "microwave heating",
    "microwave radiation",
    "enzyme activity",
    "enzyme stability",
    "Candida antarctica lipase B",
    "inactivation kinetics",
    "Arrhenius plot",
    "alcoholysis",
    "butanol"
  ],
  "suggested_hubs": [
    {
      "slug": "who-icnirp",
      "weight": 0.1,
      "reason": "Mentions microwave radiation, but no policy/guideline content is described."
    }
  ]
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.1039/b610265d
PubMed: 16990947

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