Abstract
Abstract The hydrophobicity and anti-obesity characteristics of the threonine (Thr) derivative of Monascus pigment were determined and compared with 2-(p-tolyl)-ethylamine (TEA) and tryptophan (Trp) derivatives of the same. Treatment by all three derivatives decreased body weight gain, epididymal fat weight, and abdominal fat in mice. The lowest body weight gain and epididymal fat weight were observed with the Monascus-Thr derivative treatment, which is more hydrophilic than other the other treatments tested. Further in vivo tests with the Thr derivative at different concentrations demonstrated that body weight, epididymal fat weight, and serum lipid level are reduced in a concentration-dependent manner. Significant reduction was exhibited at 0.10 mg/g-mouse/day of the Thr derivative, and less reduction was observed at 0.05 or 0.01 mg/g-mouse/day. In comparison with mice fed a normal diet, there was no statistical weight change in the liver, kidney, or spleen, indicating the Thr derivative was not toxic to mice.
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