摘要
将不同初始水分(5%、9%、12%、18%)的玉米胚在25℃、45%相对湿度的条件下进行储存,取不同储存时间的玉米胚样品检测其粗脂肪、粗蛋白含量及黄曲霉毒素B1(AFB1)含量,并提取玉米毛油检测其酸值、过氧化值、色泽及AFB1含量,研究储存条件对玉米胚及其毛油中AFB1含量和品质的影响。结果表明,在30 d的储存时间内,初始水分为5%和9%的玉米胚及其毛油的主要质量指标和AFB1含量均无明显变化,但毛油酸值(KOH)分别增加了1.31 mg/g和3.60 mg/g;初始水分为12%和18%的玉米胚,粗脂肪含量分别下降了5.05个百分点和6.09个百分点,毛油酸值(KOH)分别增加了25.89 mg/g和61.69 mg/g,色泽明显加深,玉米胚及其毛油中AFB1含量随储存时间的延长逐渐增加,至30 d时,玉米胚中AFB1含量分别达到3.192μg/kg和7.528μg/kg,对应的毛油中AFB1含量分别达到1.134μg/kg和2.128μg/kg。但所有玉米胚样品及其毛油样品中AFB1含量均未超过国家限量标准(20μg/kg)。
The corn germs with different moisture contents（ 5%,9%,12% and 18%） were stored at25 ℃ with relative humidity of 45%. During the storage,the contents of crude fat,crude protein and aflatoxin B1（ AFB1） of the corn germ and the acid value,peroxide value,color,content of AFB1 of the crude corn oil were detected so as to study the effects of storage conditions on AFB1 content and quality of the corn germ and crude corn oil. The results showed that during the 30 days＇ storage,the main quality indicators and AFB1 content of the corn germs with initial moisture contents of 5% and 9% and corresponding crude corn oils had no obvious change,except that the acid values increased by 1. 31 mg KOH / g and 3. 60 mg KOH / g,respectively. However,for the corn germs with initial moisture contents of 12% and 18%,the content of crude fat decreased by 5. 05 percentage points and 6. 09 percentage points separately,the acid values of crude corn oils increased by 25. 89 mg KOH / g and 61. 69 mg KOH / g respectively,and the color significantly darken. The AFB1 contents of corn germs with initial moisture contents of 12% and 18%went up with storage time prolonging,reaching 3. 192 μg / kg and 7. 528 μg / kg respectively on the 30 th day,and the AFB1 contents of corresponding crude corn oils were 1. 134 μg / kg and 2. 128 μg / kg respectively. However,the contents of AFB1 in all the corn germ samples and crude corn oil samples were below the national limited standard（ 20 μg / kg）.
出处
《中国油脂》
CAS
CSCD
北大核心
2015年第3期57-61,共5页
China Oils and Fats
基金
国家自然科学基金项目(31101367)
关键词
玉米胚
初始水分
储存时间
玉米毛油
黄曲霉毒素B1
酸值
corn germ
initial moisture content
storage time
crude corn oil
aflatoxin B1
acid value
