Z-(8 | 9) | Z-(10 | 11) Avermectin B1a é uma impureza geométrica resultante da isomerização de duplas ligações na cadeia macrocíclica do Avermectin B1a. Caracteriza-se por configuração Z nos loci 8 | 9 e 10 | 11 | maior polaridade relativa e comportamento cromatográfico distinto que facilita sua separação por HPLC com detecção UV e quantificação por LC-MS. A presença desta impureza pode indicar condições de síntese ou armazenamento inadequadas; sua identificação exige espectroscopia 1H e 13C NMR para confirmação estereoquímica e cromatografia de fase reversa para quantificação. Controle robusto de processo e especificações analíticas são essenciais para limitar sua concentração e assegurar conformidade.
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