The best replacement for mass spec is nmr.

The best alternatives to mass spec are rated as following:
★★★★★  nmr
★  tandem mass spec
★  hplc

Your alternative for mass spec is not listed? Suggest!
Speaking about mass spec, one probably shouldn't forget about silver staining.

Other search terms related to mass spec and their ratings are:
★★★★★ silver staining
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mass spec
nmr
tandem mass spec