Effect of cooking on physicochemical properties and volatile compounds in lotus root (Nelumbo nucifera Gaertn).
The effects of boiling and steaming on lotus root volatile compounds and some of its physicochemical properties were determined. A total of 52 compounds identified in the raw tuber by GC-MS were a combination of the rhizome's native compounds and those from the soil and water environment, and are predominantly a mixture of straight chain and cyclic alkanes, and aromatic hydrocarbons. Boiling increased concentrations of most of these compounds, unlike steaming that lowered total volatile components of the tuber. Cooking increased complexity of volatile compounds with the production of new compounds such as methylated derivatives, particularly in steam cooked lotus. Other heat-induced compounds include antioxidants such as butylated hydroxyl compounds and antifungal organic compounds such as dimethyl disulfide. Instrumental texture measurements indicate that the characteristic post-cooked retention of crunchiness in lotus root is likely to be related to retention of its springiness index through the cooking process.
College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China.
Shuyi
S
Li
College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China; Wuhan Walksun Biotechnology Limited Company, Wuhan 430000, China.
Xiaojin
X
Li
College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China. Electronic address: Lamikanra@aol.com.
Olusola
O
Lamikanra
College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China.
Qing
Q
Luo
College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China.
Zhiwei
Z
Liu
College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan 430023, China.
Jun
J
Yang
D000935:Antifungal Agents / Q000032:analysis; D000975:Antioxidants / Q000032:analysis; D003296:Cooking; D004220:Disulfides / Q000032:analysis; D006358:Hot Temperature; D031653:Nelumbo / Q000737:chemistry*; D018517:Plant Roots / Q000737:chemistry*; D055549:Volatile Organic Compounds / Q000032:analysis*
D000935:Antifungal Agents; D000975:Antioxidants; D004220:Disulfides; D055549:Volatile Organic Compounds; C021181:dimethyl disulfide
Cooking; GC–MS; Lotus root; Nelumbo nucifera; Texture; Volatiles