The purified rice amylose and amylopectins were obtained by n - butanol recrystallization method.是什么意思？

The purified rice amylose and amylopectins were obtained by n - butanol recrystallization method.

采用正丁醇反复结晶法分离得到的直链淀粉和支链淀粉有较高的纯度.

the

art. 指已提到的人（物），指说话人与听者已知的人（物），用于独一无二的事物前，与形容词最高级和序数词连用；

例句
He did have a real knowledge of the country...
他对该国的确知之甚多。

purified

adj. 纯化的；v. 使纯净，使洁净( purify的过去式和过去分词 )；

例句
Only purified water is used.
只使用纯净水。

rice

n. 稻，稻米， 大米；vt. 筛选；

例句
The sudden appearance of a few bags of rice could start a riot.
突然出现几袋大米可能会引起骚乱。

amylose

n. 直链淀粉，多糖，糖淀粉；

例句
With the method of complexing structure, amylose and amylopectin have been successively separated and purified.
以反复水洗法提取莲藕淀粉,采用络合结构法成功分离纯化直链淀粉和支链淀粉.

and

conj. 和，与，而且，于是，然后，因此；

例句
I spend a lot on expensive jewelry and clothing...
我花很多钱购买昂贵的首饰和衣服。

were

be的过去时复数和第二人称单数形式，有时代替 was,用于条件从句、动词 wish 之后等；

例句
Shops, houses, and vehicles were set ablaze.
店铺、房子和车辆全都陷于火海。

obtained

v. 获得( obtain的过去式和过去分词 )，买到，（规则、制度、习俗等）存在，流

例句
I had obtained the authentic details about the birth of the organization.
我已经掌握了有关该组织诞生的可靠的详细资料。

by

prep. 在…旁边，表示方式，由于，经过；adv. 经过，表示保留或保存时用，短暂拜访；

例句
...expensive make-up that we saw being advertised by a beautiful model...
我们所见的由一位漂亮模特代言的昂贵化妆品

butanol

n. 丁醇；

例句
The purified rice amylose and amylopectins were obtained by n - butanol recrystallization method.
采用正丁醇反复结晶法分离得到的直链淀粉和支链淀粉有较高的纯度.

method

n. 方法，条理；

例句
...an accrual method of accounting.
会计学中的应计法