Root access or SuperUser is an apk that resides in `/system/app`. If you remove it with the rest of the apps, you lose root. As a possible workaround, you can try to run:

    > adb root
    > adb shell

And see if the shell that adb opens is `$` (normal user) or `#` (root). If you're logged as a normal user, I'm afraid you will need to reinstall root in your phone.

Also, `/system/app` is like `C:\Windows` or `/bin` (in Linux), if you remove the files there, don't expect the device to run, as it won't have the necessary files to do so.