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shinobi6538

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kongxw

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2Â¥2012-05-27 16:42:48
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shinobi6538

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2Â¥: Originally posted by kongxw at 2012-05-27 16:42:48
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3Â¥2012-05-27 21:26:32
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kongxw

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4Â¥2012-05-28 11:06:16
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shinobi6538

ľ³æ (ÕýʽдÊÖ)

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4Â¥: Originally posted by kongxw at 2012-05-28 11:06:16
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D-maltose monohydrate (2.00 g, 5.55 mmol), (+)catechin
hydrate (6.00 g, 20.67 mmol), and poly(ethylene glycol)
dimethyl ether (Mn 500, 4.0 g) were mixed with 50 mM
citrate buffer, pH 6.0 (19.8 mL), and heated to 95¡ãC to
dissolve the reactants. The reaction mixture was transferred
to a shaker-incubator (125 rpm) at 37¡ãC. After 20 min,
a-D-glucosidase (100 U in 0.2 mL citric buffer) was added.
The progress of the reaction was monitored by TLC as
described above (Rfglucoside 4 0.48). After 24 h, the water
was evaporated under vacuum 50¨C60¡ãC using Bu¡§chi rotor
evaporator for about 1 h and the product was isolated on a
silica gel column (25 ¡Á 2 cm) eluting with chloroform first,
then using gradient elution with chloroform/methanol from
1:1 to 1:5 (v/v). The product (+)catechin maltoside (0.50 g,
1.11 mmol) was obtained in 20% yield, based on maltose.
5Â¥2012-05-28 12:14:49
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zier1011

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4Â¥: Originally posted by kongxw at 2012-05-28 11:06:16
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6Â¥2012-05-28 16:57:50
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shinobi6538

ľ³æ (ÕýʽдÊÖ)

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6Â¥: Originally posted by zier1011 at 2012-05-28 16:57:50
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7Â¥2012-05-28 22:23:06
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kongxw

Òø³æ (Ö°Òµ×÷¼Ò)

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8Â¥2012-05-29 09:05:37
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ganchao1776

ÖÁ×ðľ³æ (Ö°Òµ×÷¼Ò)

ÒýÓûØÌû:
8Â¥: Originally posted by kongxw at 2012-05-29 09:05:37
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9Â¥2013-09-29 13:31:01
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