Nothing in this chapter limits the rights of a holder in due course of a negotiable instrument (Section 36-3-302) or a holder to whom a negotiable document of title has been duly negotiated (Section 36-7-501) or a bona fide purchaser of a security (Section 36-8-302), and the holders or purchasers take priority over an earlier security interest even though perfected. Filing under this chapter does not constitute notice of the security interest to the holders or purchasers.