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your2007至尊木蟲 (著名寫手)
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[求助]
求一段英譯中,萬分感謝
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| We have found that the dianionic stretching band of the covalently bound phosphate in as-casein at 976 cm1 is sensitive to the ionization state and the binding ofCa 2+ or chitosan. Thus, the neutralization ofthe negative charges ofcarboxylates and phosphates by lowering the pH of as-casein solution from 6.8 to 2.0 led to a dramatic reduction of this signal. Precipitating amounts ofCa 2+ caused a shift in the phosphate signal from 976 to 986 cm1 indicating a direct electrostatic interaction between Ca2+ and phosphate. The interaction of as-casein with low molecular weight chitosan showed a small shift (ca.2 cm1) in the phosphate peak position as compared with pure as-casein with a pronounced reduction in the phosphate peak amplitude that was about a halfofthat ofcasein alone. |

金蟲 (小有名氣)
| 我們已經(jīng)發(fā)現(xiàn),在976/厘米雙陰離子拉伸帶as-酪蛋白的共價結(jié)合的磷酸對電離狀態(tài)和結(jié)合態(tài)的ca2+離子或殼聚糖非常敏感。因此,通過從6.8至2.0降低as-酪蛋白溶液的pH值,羧酸鹽和磷酸鹽的負電荷中會導致該信號的顯著減少。Ca2+離子的沉淀量導致了磷酸鹽信號從976/厘米至986/厘米的轉(zhuǎn)化。這表示Ca2+離子和磷酸之間直接靜電的相互作用。與純as-酪蛋白具有明顯的磷酸鹽峰值減少幅度相比,as-酪蛋白與低分子量的殼聚糖的相互作用表明了磷酸鹽峰值位置的一個小的移動。該移動的幅度只是as-酪蛋白單獨作用時幅值減少的一半。 |
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