- P-ISSN 1225-0163
- E-ISSN 2288-8985
Cimetidine·HCl 함유 주사액에 대한 네모파 전압전류법(SWV) 분석방법을 개발 하고자 인산염 완충용액(pH 3.01~8.97)을 지지전해질로 하여 5.00×10−4 M의 cimetidine·HCl용액에 대하여 SWV를 실행한 결과 cimetidine의 구조 내 -C=N-C≡N-의 전기화학적 환원으로 추정되는 하나의 환원 봉우리는 Ep가 -0.051V/pH씩 이동하여 수소가 관여함을 나타내었다. Cimetidine·HCl을 정량분석 하기 위하여 세 가지 인산염 완충용액을 지지전해질로 하여 농도범위 1.00×10−5 M~5.00×10−3 M에서 검량곡선을 작성할 때 기울기는127,407nA/M(pH 3.01), 115,125nA/M(pH 5.00) 및 111,287nA/M(pH 7.00)이었으며, 상관계수 R2값 0.9997의 좋은 직선 성을 나타내었다. 타그마주® 앰플을 표준물 첨가법으로 SWV 정량분석 할 때 하루 중 정밀도(n=4)는 분석시료 제조당일에 1 앰플 당 cimetidine의 함량이 203±3.8mg(규정된 함량의 102%)으로 RSD 1.9%로 나타났으며, 5일에 걸친 날짜 간 정밀도(n=4)는 1.3%이내의 RSD를 보여 정밀도가 합리적이었다.
In order to develop the square wave voltammetric method determining cimetidine in an ampoule for injection, 5.00×10−4 M cimetidine·HCl solutions prepared with phosphate buffers of various pH values (3.01~8.97) were investigated by SWV. The well defined single peak due to the electrochemical reduction of -C=N-C≡N- in the structure of cimetidine moved towards the cathodic direction by -0.051V/pH as the pH values were increased indicating the involvement of hydrogen in its reduction. The calibration curves of cimetidine·HCl in the concentration range between 1.00×10−5 M and 5.00×10−3 M prepared using three phosphate buffers yielded the slopes of 127,407nA/M (pH 3.01), 115,125nA/M (pH 5.00) and 111,287nA/M(pH 7.00) with excellent linearities of R2 0.9997. When one ampoule of Tagma Inj.® was analyzed by standard addition method by SWV, the within-day precision study (n=4) on the day of sample preparation resulted in the contents of cimetidine as 203±3.8 mg (102% of the specified contents, RSD of 1.9%) and the inter-day precision (n=4)through 5 days was reasonable as 1.3% of RSD.
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