一、抗氧化劑bht是什么
bht在(zai)食品加工中用(yong)作(zuo)抗氧(yang)化劑,bht化學名稱為(wei)2,6-二(er)叔丁基(ji)-4-甲(jia)基(ji)苯酚(fen),它以甲(jia)酚(fen)、異丁醇(chun)為(wei)原料,以濃硫酸作(zuo)為(wei)催化劑,氧(yang)化鋁為(wei)脫水劑,反應生成2.6-二(er)叔丁基(ji)對甲(jia)酚(fen)。
bht在食品加工中用作抗氧化劑,在(zai)(zai)化(hua)妝品(pin)(pin)、藥(yao)物(wu)(wu)(wu)、飛機燃料、橡膠(jiao)、石(shi)油(you)制品(pin)(pin)和(he)標(biao)本中(zhong)(zhong)(zhong)有(you)(you)(you)抗氧化(hua)作用(yong)。抗氧劑是指一(yi)些(xie)能夠抑制或(huo)者延緩高聚(ju)物(wu)(wu)(wu)和(he)其(qi)他有(you)(you)(you)機化(hua)合物(wu)(wu)(wu)在(zai)(zai)空氣(qi)中(zhong)(zhong)(zhong)熱氧化(hua)的有(you)(you)(you)機化(hua)合物(wu)(wu)(wu)。通俗來說,即是能防止聚(ju)合物(wu)(wu)(wu)材料因(yin)氧化(hua)引起變(bian)質(zhi)(zhi)(zhi)的物(wu)(wu)(wu)質(zhi)(zhi)(zhi)。bht常被應(ying)用(yong)于(yu)各種(zhong)塑料膠(jiao)袋中(zhong)(zhong)(zhong),是導致(zhi)紡(fang)織品(pin)(pin)酚黃(huang)現象(xiang)的潛在(zai)(zai)因(yin)素之一(yi),從而致(zhi)使被包裝(zhuang)的紡(fang)織品(pin)(pin)有(you)(you)(you)可能在(zai)(zai)運輸和(he)儲存過程中(zhong)(zhong)(zhong)發(fa)生黃(huang)變(bian)現象(xiang)。因(yin)此(ci)有(you)(you)(you)很多品(pin)(pin)牌已經禁(jin)止其(qi)產品(pin)(pin)包裝(zhuang)袋含有(you)(you)(you)工業(ye)級bht類物(wu)(wu)(wu)質(zhi)(zhi)(zhi)。只允許含有(you)(you)(you)食品(pin)(pin)級bht類物(wu)(wu)(wu)質(zhi)(zhi)(zhi)。
二、抗氧化劑bht在日化中添加用量是多少
對于化妝品來(lai)說,抗(kang)氧(yang)(yang)(yang)化(hua)劑可(ke)以(yi)分為(wei)兩大類,物(wu)理抗(kang)氧(yang)(yang)(yang)化(hua)劑和(he)活性(xing)抗(kang)氧(yang)(yang)(yang)化(hua)劑,其中(zhong)物(wu)理抗(kang)氧(yang)(yang)(yang)化(hua)劑是(shi)用(yong)于(yu)穩定產品基質,抑制基質中(zhong)一些活性(xing)成(cheng)分氧(yang)(yang)(yang)化(hua)的(de)抗(kang)氧(yang)(yang)(yang)化(hua)劑。這(zhe)些抗(kang)氧(yang)(yang)(yang)化(hua)劑包括(kuo):BHT、BHA、沒食子酸等等,在這(zhe)些抗(kang)氧(yang)(yang)(yang)化(hua)劑中(zhong),最(zui)常用(yong)的(de)是(shi)bht,它具有酚(fen)的(de)結構,相對穩定一些,色(se)澤(ze)淺,常用(yong)量為(wei)0.1%,但是(shi)由(you)于(yu)其酚(fen)的(de)結構,因此對重(zhong)金屬離子特(te)別是(shi)鐵離子相對敏感,也會變色(se),所以(yi)應和(he)螯合劑如EDTA配合使用(yong)。