OPN1LW and myocardial ischemia: It is well known that OJP has anti-myocardial ischemia effect, but due to its short half-life in vivo, in order to improve the retention time of OJP in the body, using carboxymethylated radix ophiopogonis polysaccharide (ROP) and amino-terminated methoxy-PEG to form potentially bioactive PEGylated ROPs.