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    Test Biuret Test Reagents CuSO4 sol’n‚ diluted NaOH Test for Intact proteins and protein hydrlysates (at least tripeptide‚ 2 peptide bonds Result Pink to violet blue color Ninhyrin Test 1‚2‚3-indanetrione monohydrate or triketohydintene hydrate‚ ethanol Alpha- amino group (usually a general test for amino acids) Xanthoproteic Test Conc. HNO3‚ conc. NaOH For W‚F‚Y (aromatic except for H) Blue to blue-violet Oxidative decarboxylation color & deamination

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    monomers called proteins are important to our body. Protein is important because it composes parts of our body and assists in bodily functions. A type of protein named keratin makes up our hair and nails. Protein is used in your body to repair and build tissue‚ and it is a necessity in making hormones‚ enzymes‚ and other chemicals in the body. Many people use protein substances and supplements in correlation with weight lifting and working out to strengthen muscles with the protein characteristics

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    Determination of Protein Content Using Kjedahl and Titration 2.0 Introduction Proteins are polymers. They are the source of dietary amino acids and are used for growth and maintenance of living systems. They are costlier sources of energy compared to carbohydrates and fats and hence the human body utilizes proteins mainly for biosynthesis rather than as an energy source‚ though the energy yield is 5 kcal/g of protein. Twenty different types of amino acids occur naturally in proteins. Proteins differ

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    BIURET FOOD TEST FOR PROTEINS molecules consisting of one or more chains of amino acids.Proteins are complex molecules that react differently to many compounds but are also fragile and cannot withstand high temperatures or strong acids and bases without degrading. The Biuret Method‚ or biuret test‚ is used to detect the presence of peptide bonds. It has this name because it reacts positively to the biuret molecule’s peptide bonds. Correctly evaluating the number of peptide bonds is a step towards

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    PROTEIN Prior to completing the lab experiment‚ it was predicted that whipping cream‚ soy milk‚ and the flour solution would all contain proteins. Looking back at the collected observations it can be concluded that the hypothesized statements were all deemed accurate. However‚ corn syrup was the only substance that did not test positive for proteins. This abnormality was researched‚ and it is now clear why only three out of the four substances tested positive for proteins. To start‚ it was hypothesized

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    Bradford Protein Asssay

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    Question 5: The chromophore in this assay is Coomassie Brilliant Blue dye. Question 6: It is important to set up a blank to separate the solute (saline) from the protein (stock). By subtracting the absorbance of the blank (which has no protein present) from the original absorbance the absorbance of the protein at each concentration will remain. Question 7: The Lowry method relies on two different reactions. The first is the formation of a copper ion complex with amide bonds‚ forming reduced

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    October 2‚ 2012 Biochemistry I Circular Dichroism and Secondary Structure of Proteins Proteins are vital to an organism life; they are involved in nearly all cellular functions. It is an essential part of enzymes‚ the cellular membrane‚ active transport‚ protein synthesis and wound healing. Because one relies so heavily upon proteins and its function the structure of proteins is also very important. “The way a protein will fold over its self-determines how it interacts with other chemicals in its

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    How Primary Structure Determines Protein Function Proteins are everywhere. As enzymes‚ they catalyse chemical reactions. There are many different types of proteins: carrier and channel proteins which transport substances‚ receptor proteins which are recognition site for antibodies and hormones‚ structural proteins which support cells and tissues‚ and hormones which transmit information. Proteins are big molecules with large molecular masses that are made up of many amino acids; they’re‚ essentially

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    Task-2 Part-2 Fibrous proteins /collagen: From my diagram I can observe the quaternary structure is 3 helical polypeptides which are looped around and is held by hydrogen bonds. The 3 stranded molecules runs parallel to others and the disulphide cross-linkages between the r-groups of the amino acid holds the molecules together forming fibres. Collagen molecules forms covalent bonds which are called cross links‚ with other collagen molecules next to it. The cross-links that form are shocked along

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    Proteins are the building blocks of our cells. The proteins that are in our body and ingested are broken down into amino acids and used throughout the body. Our bodies need protein to provide fuel to do the basic of functions. Protein helps to give energy and helps with muscles‚ bones‚ and cells growth. There are two different types of proteins. Complete protein provides all the amino acids that are needed within the body. Incomplete proteins provide some but not all of the necessary amino

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