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送交者: 方舟子 于 2007-03-30, 08:30:23:

回答: 桂铭的反击! 由 USTC3 于 2007-03-30, 07:48:31:

这是冒充内行招摇撞骗欺骗外行的典型,拿一些不相干的
文献和术语吓唬人。比如:

【居然敢拿10年前的教科书来做幌子忽悠,连食物过敏的机理都忘记了,】

还不如拿prion说事呢。能躲过降解并从跑入体内的蛋白质最大
的可能恰恰是引起过敏或成为毒素。不知谁知道有哪种天然
蛋白质能直接从肠道吸收还能发挥生理作用的?

【Q:奶中有没有对促进骨质成长的蛋白质类生理活性物质?
A:有。比如calcitonin, lactoferrin。】
【Q:蛋白质类生理活性物质calcitonin, lactoferrin能否通过口服吸收?
A:可以。】

没有任何证据证明calcitonin, lactoferrin能通过口服吸收。
已知calcitonin口服无效。
没有任何证据表明lactoferrin口服后能起到促进骨质生长的
作用,仅有的两篇文献都是通过组织培养或注射的方式。
lactoferrin口服后发挥的抗菌、抗病毒或抗肿瘤是由于其降解
产生的多肽在小肠表皮细胞通过小肠免疫起作用的,而不是被
吸收进入体内。实际上实验表明lactoferrin及其降解产物都
不能进入血液中:
No detectable transfer of dietary lactoferrin or its functional fragments to portal blood in healthy adult rats.
Biosci Biotechnol Biochem. 2004 Apr;68(4):853-60.

We investigated the transfer of dietary bovine lactoferrin (LF) and its functional lactoferricin (LFcin) B-containing fragments to the portal blood of healthy adult rats by using several techniques. After a single administration of (125)I-labeled LF, radioactive bands were detected in autoradioluminograms of the portal blood, but similar bands were also observed after the administration of [(125)i]NaI. Although ovalbumin was detected by ELISA at 3-18 ng/ml in the portal blood plasma after an overnight administration, no LF was detected (< or =1.5 ng/ml). The antibody-captured ovalbumin fragments, but not the LF fragments, were detected in the plasma by surface-enhanced laser desorption/ionization affinity mass spectrometry (SELDI affinity MS). We finally attempted to detect the LFcin B-containing fragments by SELDI affinity MS with on-chip LFcin B-conversion, but could not detect them (< or =1 ng/ml) in the portal blood after the LF ingestion. The level of LF or its functional fragments transferred to the portal blood was therefore extremely low, if any.




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