Results 1 to 2 of 2

Thread: Effect of brew temp

  1. #1
    Senior Member
    Join Date
    Jul 2008
    Posts
    145

    Effect of brew temp

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    I have had a boys look through the forum and couldnt find anything about the effects of brew temps.
    Now I have a minore III with a PID. What should be the effects of raising or lowering the brew temp. Can anyone she light on this matter?
    Regards
    Crisp Image

  2. #2
    A_M
    A_M is offline
    Guest
    Join Date
    Mar 2006
    Posts
    6,381

    Re: Effect of brew temp

    Behmor Brazen - $249 - Free Freight
    Quote Originally Posted by 04352E3437182E2A262022470 link=1257932633/0#0 date=1257932633
    I have had a boys look through the forum and couldnt find anything about the effects of brew temps.
    Now I have a minore III with a PID. What should be the effects of raising or lowering the brew temp. Can anyone she light on this matter?
    Regards
    Crisp Image
    Some of the temp requirements will depend on teh beans and what your wanting to achieve...

    If ya have a subscription..

    http://www3.interscience.wiley.com/journal/102523068/abstract?CRETRY=1&SRETRY=0

    Abstract

    The final quality of espresso coffee (EC) depends upon certain technical conditions, such as the extraction temperature used in preparing it. The aim of this work was to investigate the effects of water temperature (88, 92, 96 and 98C) on the final quality of three types of EC (Arabica, Robusta Natural blend and Robusta Torrefacto blend) in order to select the optimal temperature. Volatile compound (analysed by Static headspace gas chromatography/mass spectrometry) and sensory flavour profiles were the most relevant parameters, whereas physicochemical, taste and mouthfeel parameters were not very useful for selecting the water temperature.

    For Arabica and Robusta Natural blend ECs, 92C was the optimal water temperature. For Robusta Torrefacto blend EC the overall acceptability might lead to the selection of 88C as the ideal water temperature, but the high percentages of key odorants related to roasty and earthylmusty flavours and the not hot enough perception dictated the selection of 92 C in this case as well.


    Then to add to the confusion / clarity..

    http://www.ingentaconnect.com/content/jws/jsfa/2007/00000087/00000004/art00006


    Abstract:

    Espresso coffee is a polyphasic beverage in which the physico-chemical and sensory characteristics obviously depend on both the selection of ground roasted coffee and the technical conditions of the percolation process.

    The aim of this work was to evaluate the influence of the coffee/water ratio on the physico-chemical and sensory quality of espresso coffee. Furthermore, the influence of botanical varieties (Arabica and Robusta) and the type of roast (conventional and torrefacto) on the selection of coffee/water ratio was studied. The relationship between pH and the perception of acidity intensity is discussed in relation to the influence of the coffee/water ratio, type of coffee and roast. The optimisation of other technical parameters in previous studies seemed to minimise the influence of an increase in the coffee/water ratio on the extraction of soluble and solid compounds.

    In fact, only some sensory attributes, such as bitterness, astringency and burnt, acrid and earthy/musty flavours were proposed as relevant to the selection of 6.5 g 40 mL[ch8722]1 or 7.5 g 40 mL[ch8722]1 in conventional roasted coffees (Arabica 100% and Robusta blend), and 6.5 g 40 mL[ch8722]1 in torrefacto roasted coffees. On the other hand, the addition of sugar during the roasting process in torrefacto roast coffees seemed to contribute to a higher generation of acids, melanoidins and other compounds by the Maillard reaction or caramelisation, which led us to select the lowest coffee/water ratio. Copyright 2006 Society of Chemical Industry



Similar Threads

  1. Giotto Premium Brew Temp Low
    By kcstueber in forum Brewing Equipment - Pointy End ($1500-$3000)
    Replies: 5
    Last Post: 26th January 2010, 01:05 PM
  2. Replies: 0
    Last Post: 8th September 2009, 11:37 PM
  3. Brew temp uncertainties on HX E61s
    By NewToEspresso in forum Brewing Equipment - Pointy End ($1500-$3000)
    Replies: 36
    Last Post: 24th July 2008, 08:51 AM
  4. Giotto Brew Temp
    By mcknightp in forum Brewing Equipment - Pointy End ($1500-$3000)
    Replies: 1
    Last Post: 16th June 2008, 02:46 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •