It seems there's a number of brands and companies to choose from, and no one I know has performed this test. Abcam's kit seems to be the most widely used from the literature. Do you have any brands to recommend or any secret tips to share?
Thanks!
http://www.abcam.com/ps/products/176/ab176724/documents/NADP%20NADPH%20Assay%20Kit%20(Fluorometric)-ab176724-protocol%20(website).pdf