The neutral/basic fraction was furthermore separated into 4 fractions using silica gel normal phase chromatography, and each fraction was then concentrated and analyzed using gas chromatography-mass spectrometry. In comparison with the pure standards and the retention indices reported in the literature, a total of 302 volatile compounds were identified in Changyu XO brandy, including 30 alcohols, 35 aldehydes and ketones, 20 carboxylic acids, 104 esters, 24 substituted benzenes and derivatives, 14 phenolic derivatives, 14 acetals, 16 furan derivatives, 22 terpenic and norisoprenoidic derivatives and 23 others.

實(shí)驗(yàn)先采用液-液萃取方法提取張?jiān)O級(jí)白蘭地的揮發(fā)性成分，然后將酸性成分與堿性和中性成分分離，再采用柱色譜分離手段將其分離為若干個(gè)級(jí)分并濃縮，采用氣相色譜-質(zhì)譜、標(biāo)準(zhǔn)品比對(duì)亚洲欧美中文字幕在线一区下载、保留指數(shù)值比較等方法對(duì)分離得到的各級(jí)分中的成分進(jìn)行了鑒定，在白蘭地中共鑒定出302種揮發(fā)性成分欧美XXXX在线免费不卡，包括醇30種午夜h片、醛酮類35種、酸類20種免费人成在线观看网站体验、酯類104種日韩欧美人成第一页、苯同系物及其衍生物24種欧美黄2、酚類14種、縮醛14種www.av天堂.cn、呋喃類16種欧美三级在线不卡观看、萜烯類22種和其他物質(zhì)23種。

Results showed that the high content of TFs could be obtained by collection the fractions of special zones of column chromatography when crude TFs used as raw material, NAK as adsorbent and the elutes were concentrated by vacuum evaporator and freeze-dried.

結(jié)果表明：以茶黃素粗品為原料天天干在线视频观看，NKA為柱填充料人人摸人人操589，收集解吸液一定區(qū)段的餾分，真空濃縮jizzjizz日本高清视频免费、冷凍干燥电影一区小说区偷拍区，即可制得高含量茶黃素制品，得率為48.04％日韩一级性交网站，茶黃素總量大于15％黄色片-级片。

Company-related products have Continental fireplace, reliefs, figure statue, animal sculpture, decorative goods, cultural stone, thread board, decorative articles,íù, modeling ceilings, flower pot, fountain,°×, seats, pavilion, etc. art sculpture modeling products.

公司相關(guān)產(chǎn)品有歐式壁爐、浮雕老熟妇嗷嗷叫91九色、人物雕像日韩美女午夜高清一级、動(dòng)物雕塑、擺設(shè)品国产呦系列网站在线观看、文化石、線板中国在线无码视频、飾條操逼午夜视频、羅馬柱、造型天花板人与动人物杂交欧美在线播放、花缽自拍偷拍第2页、噴水池、窗套国产最新黄网站在线观看、座椅日韩福利国内主播在线播放视频、涼亭等各類藝術(shù)雕塑造型產(chǎn)品。

Glycidyl benzoate,glycidyl propionate,glycidyl acetate were obtained respectly through a phase-transfer catalytic methodology using sodium benzoate, sodium propionate, sodium acetate and epichlorohydrin as raw materials, and pure products were obtained though vaccum distillation.β-cyclodextrin and glycidyl benzoate, glycidyl propionate, glycidyl acetate, reacted in organic solvent and goal product were

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