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Nicotine release profile across dialysis membrane from carbopol and xanthan gum patches having different drug loading concentration; a xanthan gum loaded with 1 mg/cm2 nicotine, b xanthan gum loaded with 2 mg/cm2 nicotine, c xanthan gum loaded with 2.75 mg/cm2 nicotine, d xanthan gum loaded with 3.75 mg/cm2 nicotine, and e carbopol loaded with 2 mg/cm2 nicotine
