Bread aroma is enhanced, as is the crust color, by a build-up of melanoidin compounds from nonenzymatic browning reactions.
面包的风味改善了,面包表皮的颜色也由于非酶褐变反应所生成的类黑精化合物而有所改善。
英语百科
Browning (food process)
Browning is the process of becoming brown, especially referring to food. Browning foods may be desirable, as in caramelization, or undesirable, as in an apple turning brown after being cut. Foods, including beverages, can turn brown through either enzymatic or non-enzymatic processes.