Chemical‐free approach for Z‐isomerization of lycopene in tomato powder: Hot air and superheated steam heating above the melting point of lycopene
Chemical‐free approach for Z‐isomerization of lycopene in tomato powder: Hot air and superheated steam heating above the melting point of lycopene
复制标题
番茄粉中番茄红素 Z 异构化的无化学方法：热空气和过热蒸汽加热至番茄红素熔点以上
DOI：
10.1002/ejlt.201900327
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发表时间：
2020
影响因子：
2.7
通讯作者：
Motonobu Goto
中科院分区：
文献类型：
--
作者：
Masaki Honda;Hakuto Kageyama;Takashi Hibino;Rungaroon Waditee‐Sirisattha;Tetsuya Fukaya;Yoshiaki Hayashi;Motonobu Goto
Z‐isomers of lycopene exhibit higher bioavailability and antioxidant capacity than those of the all‐E‐isomer. Therefore, it is important to develop an efficient and environmentally friendly procedure forZ‐isomerization. The current methods forZ‐isomerization of (all‐E)‐lycopene use toxic chemicals such as organic solvents and catalysts. This study is aimed to develop a chemical‐free method forZ‐isomerization of (all‐E)‐lycopene in tomato powder by hot air and superheated steam heating. TheZ‐isomerization reaction is promoted by heating above the melting point of lycopene. When heated with superheated steam, the thermal decomposition of lycopene is suppressed compared to that when heated with hot air. When tomato powder is heated at 240 °C for 5 min by superheated steam, the totalZ‐isomer content and remaining lycopene are 69.0% and 90.7%, respectively, while with hot air heating, the totalZ‐isomer content and remaining lycopene are 69.9% and 68.0%, respectively. These results indicate that the thermalZ‐isomerization of lycopene occurs in the molten state and heating in a low oxygen atmosphere suppresses the thermal decomposition of lycopene.Practical Applications: Tomato powder rich in lycopeneZ‐isomers is an important ingredient for the food and animal feed industries. SinceZ‐isomers of lycopene are more soluble in solvents including ethanol which is a low‐toxicity and environmentally friendly solvent, the efficiency of lycopene extraction with ethanol can be improved by using theZ‐isomer‐rich tomato powder as a raw material. The obtainedZ‐isomer‐rich extract has a high added value because theZ‐isomers have higher bioavailability and antioxidant capacity than those of the all‐E‐isomer. In addition, since lycopeneZ‐isomers exhibit higher accumulation efficiency and better color improvement in hen egg yolks than those of the all‐E‐isomer,Z‐isomer‐rich tomato powder is an effective animal feed.
