• catalysis of glyceraldehyde synthesis by primary or secondary amino acids under prebiotic conditions as a function of ph

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1097
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    • شماره تماس دبیرخانه رویداد: -
     the synthesis of an excess of d-glyceraldehyde by coupling glycolaldehyde with formaldehyde under prebiotic conditions is catalyzed by l amino acids having primary amino groups at acidic ph’s, but at neutral or higher ph’s they preferentially form l-glyceraldehyde. l amino acids having secondary amino groups, such as proline, have the reverse preferences, affording excess l-glyceraldehyde at low ph but excess d-glyceraldehyde at higher phs. detailed mechanistic proposals make these preferences understandable. the relevance of these findings to the origin of d sugars on prebiotic earth is described.

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