ciznet Posted November 21, 2014 Share Posted November 21, 2014 A food sample comprise 2.0g protein, 1.0g fat, 4.0 Carbohydrate. what is the Energy contributed by Fat alone in joule and Kilocal? Link to comment Share on other sites More sharing options...
fiveworlds Posted November 21, 2014 Share Posted November 21, 2014 It is rarely measured as just fat alone. You would find the heat of combustion. Link to comment Share on other sites More sharing options...
ciznet Posted November 21, 2014 Author Share Posted November 21, 2014 what if there is a standard Calorie equivalents for 1g of these nutrient? Link to comment Share on other sites More sharing options...
fiveworlds Posted November 21, 2014 Share Posted November 21, 2014 Hardly there are many types of fats. Each with their own heat of combustion. Link to comment Share on other sites More sharing options...
John Cuthber Posted November 22, 2014 Share Posted November 22, 2014 (edited) Hardly there are many types of fats. Each with their own heat of combustion. Not really. They are all very similar. All fats give about 9 Calories per gram. Edited November 22, 2014 by John Cuthber Link to comment Share on other sites More sharing options...
fiveworlds Posted November 22, 2014 Share Posted November 22, 2014 (edited) All fats give about 9 calories per gram. How do you even know that? Anyway I didn't know how they extracted the fat from food so I looked it up.https://www.apsu.edu/sites/apsu.edu/files/chemistry/SP11_1021_DETERMINING_HOW_MUCH_FAT_IS_IN_FOOD.pdf They find the percentage of fat by mass in a number of samples and take an average. Edited November 22, 2014 by fiveworlds Link to comment Share on other sites More sharing options...
John Cuthber Posted November 22, 2014 Share Posted November 22, 2014 (edited) How do you even know that? Anyway I didn't know how they extracted the fat from food so I looked it up.https://www.apsu.edu/sites/apsu.edu/files/chemistry/SP11_1021_DETERMINING_HOW_MUCH_FAT_IS_IN_FOOD.pdf I know it because I read a lot. I assume from what you said that you did not know it. Since you didn't know it, and you have just implied that you wouldn't expect to know it, why did you post a reply that is wrong and where you knew that you didn't have any understanding of the issues? Incidentally,I suspect that this sort of thing is more commonly used to measure fat in food these days. http://www.oxford-instruments.com/OxfordInstruments/media/industrial-analysis/magnetic-resonance-pdfs/Using-Nuclear-Magnetic-Resonance-to-Test-Fat-Content-in-Foods.pdf Edited November 22, 2014 by John Cuthber Link to comment Share on other sites More sharing options...
fiveworlds Posted November 22, 2014 Share Posted November 22, 2014 I know it because I read a lot. Oh right I read lots too http://books.google.ie/books?id=zIq9UBNQOskC&pg=PA53&lpg=PA53&dq=heat+combustion+of+fats+chemistry&source=bl&ots=cdqcl3SqYe&sig=FNOoqYFzD-n_mOP_Vu8sesPAzM4&hl=en&sa=X&ei=BZ5wVKySConuaObDgrgD&redir_esc=y#v=onepage&q=heat%20combustion%20of%20fats%20chemistry&f=false Link to comment Share on other sites More sharing options...
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