Browning Reaction

Any of a number of complex enzymatic—e.g., oxidization—and non-enzymatic—e.g., caramelization, degradation of ascorbic acid and Maillard reaction—reactions that affect foods when processed or stored
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Some biochemical agents act directly as inhibitors of PPO, while others induce a non-favorable environment for the browning reaction and, others reac with the reaction products of PPO before they become colored pigments (Chiabrando and Giacalone, 2012; Sulaiman et al.
The heating processes of palm saps assisted the browning formation of palm sugar, which induced the reaction of non-enzymatic browning reaction.
The enzymatic browning reaction occurs due to presence of the polyphenoloxidase enzyme (PPO) that catalyzes the oxidation reaction of phenolic compounds (Eissa, Fadel, Ibrahim, Hassan, & Elrashid 2006; Oliveira, Soares, Paula, & Viana 2008).
The chemical process that beef goes through during cooking is called The Maillard or browning reaction.
But Joel Brooks, Marketing Specialist at Okanagan, disagrees that Arctic apples' benefits are purely cosmetic, noting that not only do they have significant potential to reduce food waste, the resistance to browning results in better taste, texture and likely a retention of healthful components like vitamin C and antioxidants, which are typically burned up in the browning reaction.
The Mailliard browning reaction also occurs at high temperatures when groups of amino acids, peptides or proteins react with certain groups of sugars.
8] Ruiter A The Browning Reaction of Glycolic Aldehydes with Amino-Ethanol III: Renewed Investigations on the Structure of a Reaction Product and Comparison with Aldose Amino-Ethanol Browning.
Studies on products of browning reactions: Antioxidative activities of products of browning reaction prepared from glucosamine.
Studies on products of browning reaction: Antioxidative activities of browning reaction prepared from glucosamine.
For PPO to cause the browning reaction, it needs something to act on--a substrate--as well as exposure to oxygen.