Alpinia officinarum Rhizome ameliorates the UVB induced photoaging through attenuating the phosphorylation of AKT and ERK

Table 2 Sun protection factor (SPF) of WEAOR

Wavelength, nm	EE x I	Absorbance for WEAOR (Abs1)	Absorbance for para-amino benzoic acid (Abs2)	Abs1 x EE x I (WEAOR)	Abs2 x EE x I (para-amino benzoic acid)
290	0.0150	0.104	2.272	0.00157	0.03408
295	0.0817	0.083	1.987	0.00678	0.16192
300	0.2874	0.073	1.842	0.02117	0.52958
305	0.3278	0.287	1.317	0.09407	0.43171
310	0.1864	0.671	0.820	0.12513	0.15291
315	0.0837	1.124	0.804	0.09407	0.06735
320	0.0180	0.023	0.509	0.00042	0.00916
Total				0.34323	1.38673
Total x CF (10)				3.43236	13.86738
SPF values				3.43	13.86

EE The erythemal effect spectrum, I The solar intensity spectrum, Abs The absorbance of sunscreen product, CF The correction factor (= 10)

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