Coffee Analysis With An Electronic Nose


This  Electronics Engineering Seminar Topic deals with the following:

ELECTRONIC Noses (EN), in the broadest meaning, are instruments that analyze gaseous mixtures for discriminating between different (but similar) mixtures and, in the case of simple mixtures, quantify the concentration of the constituents. ENs consists of a sampling system (for a reproducible collection of the mixture), an array of chemical sensors, Electronic circuitry and data analysis software. Chemical sensors, which are the heart of the system, can be divided into three categories according to the type of sensitive material used: inorganic crystalline materials (e.g. semiconductors, as in MOSFET structures, and metal oxides); organic materials and polymers; biologically derived materials.

The use of ENs for food quality analysis tasks is twofold. ENs is normally used to discriminate different classes of similar odour-emitting products. In particular ENs already served to distinguish between different coffee blends and between different coffee roasting levels. On the other hand, ENs can also be used to predict sensorial descriptors of food quality as determined by a panel (often one generically speaks of correlating EN and sensory data). ENs can therefore represent a valid help for routine food analysis.

The combination of gas chromatography and mass spectroscopy (GC-MS) is by far the most popular technique for the identification of volatile compounds in foods and beverages. This is because the separation achieved by the gas chromatographic technique is complemented by the high sensitivity of mass spectroscopy and its ability to identify the molecules eluting from the column on the basis of their fragmentation patterns. Detection limits as low as 1 ppb (parts per billion) are frequently reached. The main drawbacks of the approach are, however, the cost and complexity of the instrumentation and the time required to fully analyze each sample (around one hour for a complete chromatogram). Comparatively, ENs are simpler, cheaper devices. They recognize a fingerprint, that is global information, of the samples to be classified. For food products, the sensory characteristics determined by a panel are important for quality assessment. While man still is the most efficient instrument for sensorial evaluation, the formation of a panel of trained judges involves considerable expenses.

Commercial coffees are blends, which, for economic reasons, contain (monovarietal) coffees of various origins. For the producers the availability of analysis and control techniques is of great importance. There exists a rich literature on the characterization of coffee using the chemical profile of one of its fractions, such as the headspace of green or roasted beans or the phenolic fraction. In the literature up to 700 diverse molecules have been identified in the headspace. Their relative abundance depends on the type, provenance and manufacturing of the coffee. It is to be noticed that none of these molecules can alone be identified as a marker. On the contrary one has to consider the whole spectrum, as for instance the gas chromatographic profile.

COMPARISION OF ELECTRONIC NOSE WITH BIOLOGICAL NOSE
Each and every part of the electronic nose is similar to human nose. The function of inhaling is done by the pump which leads the gas to the sensors. The gas inhaled by the pump is filtered which in the human is the mucus membrane. Next comes the sensing of the filtered gas, which will be done by the sensors i.e., olfactory epithelium in human nose. Now in electronic nose the chemical retain occurs which in human body is enzymal reaction. After this the cell membrane gets depolarised which is similar to the electric signals in the electronic nose. This gets transferred as nerve impulse through neurons i.e., neural network and electronic circuitries.

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26 Comments

  • Prashant Singh
    August 12, 2009 at 9:42 pm

    Sir,
    Now i am in final year of my B.tech,so plz would u like send me some seminar (full version) on my email address.
    I will be very thankfull to you.

  • Prashant Singh
    August 12, 2009 at 9:45 pm

    Ur content of seminar are very interesting and knowledgeble.

  • geetha
    August 17, 2009 at 9:42 pm

    i want full information about enose

  • admin
    August 18, 2009 at 1:28 am

    Hello Geetha,
    You can download the full seminar from here
    http://www.101seminartopics.com/wp-content/uploads/2009/08/Coffee-Analysis-With-An-Electronic-Nose.pdf

    Thanx for visiting.

  • C Juliet Jemila
    August 20, 2009 at 2:14 am

    i am M.E student i need some latest seminar topics in computer science & engineering

  • saurabh
    September 2, 2009 at 5:42 am

    thanx !

  • vishal
    September 9, 2009 at 10:08 am

    thanks 4 this work…….

  • portable
    November 16, 2009 at 2:32 pm

    You made some good points there. I did a search on the topic and found mostpeople will agree with your blog.

  • GPS
    November 16, 2009 at 3:08 pm

    I don’t usually reply to posts but I will in this case. 🙂

  • VIJAYA N GOWDA
    December 4, 2009 at 7:29 pm

    sir as im in 7th sem ec,im suppose to give a seminar,and this topic has dragged my attention and interest a lot,even i have downloaded this seminar,whether will this downloaded information is suffiecient or if any much needed can you please guide me

  • aamani
    December 28, 2009 at 12:34 am

    i want to download all the seminar topics

  • manjula
    March 13, 2010 at 5:16 am

    sir can u send me the full information about
    electronic nose

  • sahana
    April 8, 2010 at 11:20 pm

    sir can you mail the full information of this topic…thank you

  • scuba diving
    August 1, 2010 at 8:00 am

    Very informative post. Thanks for taking the time to share your view with us.

  • kredyty
    August 5, 2010 at 2:29 am

    Thank You For This Blog, was added to my bookmarks.

  • neha
    August 12, 2010 at 5:58 am

    intrstng
    i m in 4yr ei,pls tell me more about enose nd send ppt also on my email id

  • srinu
    December 13, 2010 at 5:54 am

    nice topic ……….
    I want this topic full information plz send me

  • chikku
    February 6, 2011 at 8:47 am

    i want the powerpoint presentation of coffee analysis with an electronic nose……

  • simran
    February 25, 2011 at 3:35 am

    sir,
    will you plz suggest me a latest seminar topic with complete information.

  • kasheefa
    April 26, 2011 at 10:24 pm

    wil u send me ppt for electronic nose

  • Madhuri
    January 21, 2012 at 8:21 am

    Sir,
    can u pls mail me the ful info abt this topic and also the ppt?
    Thank you.

  • nisha
    February 11, 2012 at 7:31 am

    sir,
    iI want the ppt and full report of electronic nose send me plz

  • nadeem khan
    February 18, 2012 at 8:59 am

    sir submit me detail of electric nose

  • nadeem khan
    February 18, 2012 at 9:03 am

    sir can u please mail me about electric nose and ppt

  • swathi
    March 15, 2012 at 1:35 am

    sir this topic is good n please send the ppt to my mail id

  • Sirisha kiran
    December 7, 2012 at 3:12 pm

    I would like to recieve the entire seminar report and ppt through my email account.or kindly sent me any other latest relevant seminar topics and reports after the year 2010.i request you to do same at the earliest.

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