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1. The technique of column-switching could alter the connections between injection valve and column, column and column, column and detector.
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2. The technique of column-switching could alter the connections between injection valve and column, column and column, column and detector.
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3. The technique of column-switching could alter the connections between injection valve and column, column and column, column and detector.
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4. The cleanup methods were as follows:standard florisil column, short florisil column, cellulose carbon column and silica gel G column.
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5. The cleanup methods were as follows:standard florisil column, short florisil column, cellulose carbon column and silica gel G column.
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