Mbonnefille

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1. What is an odor

An odor (or odour) is a mixture of volatile chemical compounds, that humans or animals can perceive by the sense of olfaction. Odors are also called smells, which can refer to both pleasant and unpleasant odors. The terms fragrance, scent, and aroma are used primarily by the food and cosmetic industry to describe a pleasant odor, and are sometimes used to refer to perfumes. In contrast, malodorous, raunch, stench, reek, and stink are used specifically to describe unpleasant odors.

2. Odor analysis

Odor can be analyzed either by humans or by instruments.

2.1 Human analysis using a sensory panel Sensory analysis is a method used to describe the sensations that humans perceive with their senses - among which olfaction - when in contact with a product. Sensory analysis is conducted using a sensory panel. A sensory panel consists of a group of persons that evaluate products by means of sensing organs. There exist 2 types of panels: consumer panel and expert panel. Consumer panel perform subjective tests (I like / dislike this product) whereas expert panels conduct objective analytical tests (evaluation of odor quality and intensity). There are two types of analytical tests: - Descriptive tests: evaluation of the importance of differences between various products - Discriminative tests: evaluation consisting of determining very small differences between various products.

2.2 Instrumental analysis using an Electronic Nose

[Electronic Nose analyzers] are designed for the detection, measurement and recognition of odors, aromas and all chemical volatile organic compounds. They perform a global analysis of volatile compounds to give a chemical and smell profile of the product. They consist of: - a sampling system - a detection system - a data treatment system.

Sampling E-Nose analyzers can be coupled to autosamplers to automate the storage, incubation, agitation, headspace collection and injection of samples. These autosamplers can include sampling devices (such as headspace generation system or volatiles extraction systems) to increase the sensitivity and selectivity of the analysis.

Detection Electronic Nose detect and measure volatile organic compounds, whether or not they are an odorant. The Electronic Noses from Various detection technologies can be used:

• Metal Oxide Sensors: when volatile compounds are adsorbed onto the surface of the semiconductors this generates a change in the electrical resistance which varies with the type of volatile compound and its concentration. As instruments can include several cross-selective sensors, the range of solid, liquid or gas samples that can be analyzed is broad.
• Fingerprint Mass Spectrometry: sample headspace is analyzed without prior separation of compounds. If needed, molecules can be identified based on the fragments generated.
• Ultra Fast Gas Chromatography: solid, liquid or gas samples can be analyzed by liquid or headspace injection. The chromatograms are treated as a global fingerprint.

Data treatment Statistical analysis is used to compute and interpret electronic nose measurements; Various type of analysis can thus be performed: - Qualitative analysis(Principal Component Analysis, Discriminant Factorial Analysis models) to differentiate products based on desired parameters: quality, origin, supplier, batch, etc. - Quality control analysis(Statistical Quality Control model) to check product conformity. - Quantitative analysis(Partial Least Square model) to predict flavor / odor intensity, chemical concentration or odor unit. - Shelf life analysis to study and compare aging profiles and stability of raw materials or end products under various storage conditions.

Speedy deletion nomination of Alpha MOS - Perichrom

A tag has been placed on Alpha MOS - Perichrom requesting that it be speedily deleted from Wikipedia. This has been done under section A7 of the criteria for speedy deletion, because the article appears to be about a company or corporation, but it does not indicate how or why the subject is important or significant: that is, why an article about that subject should be included in an encyclopedia. Under the criteria for speedy deletion, such articles may be deleted at any time. Please see the guidelines for what is generally accepted as notable, as well as our subject-specific notability guideline for companies and corporations.

If you think that this notice was placed here in error, you may contest the deletion by adding {{hangon}} to the top of the page that has been nominated for deletion (just below the existing speedy deletion or "db" tag), coupled with adding a note on the talk page explaining your position, but be aware that once tagged for speedy deletion, if the page meets the criterion it may be deleted without delay. Please do not remove the speedy deletion tag yourself, but don't hesitate to add information to the page that would render it more in conformance with Wikipedia's policies and guidelines. Lastly, please note that if the page does get deleted, you can contact one of these admins to request that they userfy the page or have a copy emailed to you. Cabe6403 ^{(Talk•Sign)} 16:08, 10 August 2009 (UTC)

Speedy deletion nomination of Alpha MOS - Perichrom

A tag has been placed on Alpha MOS - Perichrom, requesting that it be speedily deleted from Wikipedia. This has been done under the criteria for speedy deletion, because the article seems to be blatant advertising that only promotes a company, product, group, service or person and would need to be fundamentally rewritten in order to become an encyclopedia article. Please read the general criteria for speedy deletion, particularly item 11, as well as the guidelines on spam.

If you can indicate why the subject of this article is not blatant advertising, you may contest the tagging. To do this, please add {{hangon}} on the top of Alpha MOS - Perichrom and leave a note on the article's talk page explaining your position. Please do not remove the speedy deletion tag yourself, but don't hesitate to add information to the article that would help make it encyclopedic, as well as adding any citations from independent reliable sources to ensure that the article will be verifiable. Feel free to leave a note on my talk page if you have any questions about this. Dereckson (talk) 17:39, 18 August 2009 (UTC)

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