Proteins, nucleic acids are best example of natural polymers. Similarly cellulose is also a natural polymer which acts as main structural component of plants. Usually natural polymers are composed by condensation polymerisation with the elimination of water molecule.
Drug-Laboratory Test Interactions. False-positive urine immunoassay screening tests for phencyclidine (PCP) and amphetamine have been reported in patients taking venlafaxine. This is due to lack of specificity of the screening tests. False positive test results may be expected for several days following discontinuation of venlafaxine therapy. Confirmatory tests, such as GC/MS will clear that misconception up asap...or if you are not using pcp and your dr is sceptical.
I have to take a urine test specifically for opiates. I was wondering if darvocet, xanax, flexeril, or suboxine would cause a positive result. A screen that is testing for opiates would only show a positive result for darvocet out of the aformentioned group of drugs. To explain a little further xanax is a benzo not an opiate. Flexeril is only a muscle relaxer and once again it's not an opiate. While suboxone does contain the drug buprenorphine which is an opiate you would have to be taking a test that was specifically for buprenorphine for it to show up as a positive.