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  1. #1
    jaanu_2721's Avatar
    jaanu_2721 is offline Senior ILite
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    Default why does turmeric turn red in lemon?

    why does turmeric turn red in lemon?

    plz give a scientific reason to this question.. its urgent..Drowning


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    Question Re: why does turmeric turn red in lemon?

    Quote Originally Posted by jaanu_2721 View Post
    why does turmeric turn red in lemon?

    plz give a scientific reason to this question.. its urgent..Drowning

    HI,

    Can u tell us why???????


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    Sumathy is offline Junior ILite
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    Default Re: why does turmeric turn red in lemon?

    Hi,

    Turmeric should turn red in lime and not lemon. Lime is commonly called as 'sunnambu' in tamil and is basic in nature (pH more than 7 is called basic). Turmeric will turn red in basic medium.

    So, What is this 'urgency' about.

    Cheers,

    Sumathy


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    Default Re: why does turmeric turn red in lemon?

    sumathy,

    Looks like jaanu has some quiz or so mething...there is one more question about ozone hole in atlantic...





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  5. #5
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    Default Re: why does turmeric turn red in lemon?

    s shanvy can u give me detail reason?plzzzzzzzzz?Drowning


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    Default Re: why does turmeric turn red in lemon?

    hey jaanu..

    very simple ma.. BTW first thanks for reminding my chemistry quizzes Bow

    Lemon has citric acid. So thus When comes in contact due to the acidic conditions, tumeric changes its color from yellow to red :)

    Do you need further explanation.. let me know...

    Sumathy.. neenga solrathu different.. There are different types of lime, lemon..

    Burnt lime stones are called sunnambhu :)

    Nandhu

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    Default Re: why does turmeric turn red in lemon?

    s i need in detail and reasoning to it also..Drowning


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    Default Re: why does turmeric turn red in lemon?

    Ok here you go.. before you drown again ;)



    Turmeric is a reddish-yellow rhizome. Now how did it get these colors? The more prominent yellow color is due to the presence of the xanthophyll pigment, while the reddish-orange color comes from carotene pigment.

    The phytochemicals in Lemon are : Neral, Geranial, Limonene, Nerol, Geraniol, Terpineol, Caryophyllene, Curcumene, Isovalerianic acid, Eupafolin, Hispidulin, Eupatorin, Salvigenin, Apigenin, Luteolin, Geraniol, Flavonoids. There are many active curcumene compounds and when these stems are dried & powdered for our usage, their concentration increases. Now during this experiment, when this powder is dissolved in water and a pinch of lime is added to it, the organic acids are neutralised by alkaline lime. Thus, as a result, the yellow xanthophyll is suppressed and orange-red carotene pigment becomes more prominent. So what you see turmeric turning red.

    Hope this helps :)

    Last edited by Nandshyam; 27th March 2008 at 08:48 PM.
    Nandhu

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    Default Re: why does turmeric turn red in lemon?

    thats really helpful nandu


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    Default Re: why does turmeric turn red in lemon?

    Hi Nandu,

    Hmm, Some confusion here. Turmeric (actually curcumin) turns red in basic medium and not in acidic medium. This is the basis of the turmeric indicator, is it not? "Turmeric contains a yellow pigment called curcumin that is yellow at pH 7.4 and orange to red at pH 8.6". You can get more information on the net if you google.

    For instance, for arathi, we add turmeric and chunnambu (the edible one) to get red colour. Correct me if am wrong.

    Cheers,

    Sumathy


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