用硅胶分离和检识生物碱时常出现拖尾或形成复斑、或Rｆ值过小，影响检识效果，为避免这种情况，常采取措施

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SQL Error: select id,body,options from ***_enewstiku where sourceid='26291' and id < 2199418 and id<>'2199418' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='26291' and id > 2199418 and id<>'2199418' order by id asc limit 5