TY  - JOUR
T1  - Spectrophotometric Measurement of Available Lysine and Protein Carbonyls in Commercial
Infant Formulas and Milk Products
AU - Olusegun Otemuyiwa, Israel AU - Olabisi Yahya, Olalekan 
JO  - Journal of Food Technology
VL  - 14
IS  - 2
SP  - 9
EP  - 13
PY  - 2016
DA  - 2001/08/19
SN  - 1684-8462
DO  - jftech.2016.9.13
UR  - https://makhillpublications.co/view-article.php?doi=jftech.2016.9.13
KW  - Investigated
KW  -quality
KW  -milk products
KW  -measurement
KW  -carbonyls
AB  - This study investigated the impact of storage
on protein quality in infant formulas and milk products
through measurement of available lysine and formation of
protein carbonyls. The samples manufactured by dietetic
company were collected from open market as displayed
on the shelves, these consists of four brands of powdered
milk, three of evaporated tin milk and two of infant cereal
products.. Available lysine and protein carbonyls were
measured after derivatization with 1-fluoro-2-4-
dinitrobenzene (FDNB) and 2, 4-dinitro-phenylhydrazine
(DNPH) respectively, using spectrophotometer. The
results showed that moisture content, protein, available
lysine and protein carbonyl ranged from 2.04-37.81%,
9.23-29.07%, 7.24-24.57 g<sup>&#150;1</sup> 100 g protein and
0.45-18.96 nmol/mg proteins, correspondingly. Protein
carbonyl increases whereas available lysine decreases as
storage period is prolonged. The study concluded that
though infant formulas and milk products was said to a
have prolonged shelf-life, the products in the open
markets especially in the tropics should be periodically
analyzed to ensure that the protein quality did not
deteriorate before the product is consumed.
ER  -