Consumption of purple sweet potato leaves modulates human immune response: T-lymphocyte functions, lytic activity of natural killer cell and antibody production

Table 2 Change of plasma and urine β-carotene and polyphenol levels in subjects (mean±SD)

	Baseline	Washout	1 wk	2 wk
β-carotene in plasma (mmol/L)
Control	0.088±0.06	0.076±0.02	0.104±0.05	0.125±0.05a
PSPL	0.091±0.04	0.107±0.04	0.125±0.05c	0.139±0.04c
Polyphenol in plasma (mg GAE/dL)
Control	61.61±1.39	61.04±1.94	58.86±1.38c	59.02±1.35c
PSPL	59.21±3.34	58.87±1.63	59.44±2.00	60.01±1.41
Polyphenol in urine (mg GAE/dL)
Control	8.38±1.50	8.28±1.19	6.76±131	6.95±1.36c
PSPL	8.20±0.95	8.25±1.58	10.30±0.89ce	10.27±1.39ce

^aP<0.05 for 2 wk vs baseline, washout, 1 wk.

^cP<0.05 for baseline vs 1 and 2 wk.

^eP<0.05 for control vs PSPL.