CAJ | 학술논문

通过对室温通风(18±2)℃及高温高湿(温度50℃,70%湿度)储存的米糠粗脂肪、粗蛋白含量及制备的米糠浸出毛油酸值、过氧化值、色泽等指标的测定,分析研究储存条件对米糠及米糠毛油品质的影响,并通过吸附脱色试验,研究储存条件对其浸出毛油脱色难易程度的影响。结果表明：两种储存条件均会使米糠的粗脂肪含量降低、粗蛋白含量升高；随储存时间的延长,室温通风储存下米糠浸出毛油色泽变化不大,过氧化值呈波动小幅增长,储存10 d的米糠制备的米糠毛油经脱色后色泽接近米糠油国标二级标准；然而米糠经高温高湿储存6d后,因发热霉变和严重酸败,其浸出毛油酸值大幅度升高,过氧化值降低,毛油色泽呈黑棕色,并有难闻的霉变味,对其进行吸附脱色时活性白土用量达到油质量的13%仍难将其色泽脱除,达不到米糠油国标四级色泽的指标要求。
통과대실온통풍(18±2)℃급고온고습(온도50℃,70%습도)저존적미강조지방、조단백함량급제비적미강침출모유산치、과양화치、색택등지표적측정,분석연구저존조건대미강급미강모유품질적영향,병통과흡부탈색시험,연구저존조건대기침출모유탈색난역정도적영향。결과표명：량충저존조건균회사미강적조지방함량강저、조단백함량승고；수저존시간적연장,실온통풍저존하미강침출모유색택변화불대,과양화치정파동소폭증장,저존10 d적미강제비적미강모유경탈색후색택접근미강유국표이급표준；연이미강경고온고습저존6d후,인발열매변화엄중산패,기침출모유산치대폭도승고,과양화치강저,모유색택정흑종색,병유난문적매변미,대기진행흡부탈색시활성백토용량체도유질량적13%잉난장기색택탈제,체불도미강유국표사급색택적지표요구。
Rice bran was separately stored in ventilated environment at room temperature (18 ± 2)℃ and high temperature with high humidity environment ( temperature 50℃, humidity 70%) , and the contents of crude fat, crude protein of the two kinds of rice bran and the acid values, peroxide values and color of the solvent extracted crude rice bran oils were detected to study the effect of storage conditions on the qualities of rice bran and crude rice bran oil. In addition, the impact of storage conditions on the bleach-ing effect of crude rice bran oil was studied through adsorption bleaching experiment. The results showed that the content of crude fat in rice bran decreased while the content of crude protein increased under the two types of storage conditions;with storage time prolonging,the color of solvent extracted crude rice bran oil changed a bit in the ventilated environment at room temperature, the peroxide value increased slight-ly, and the color of bleached rice bran oil was close to the second grade rice bran oil of the national standard after ten days’ storage of rice bran. After six days’ storage at high temperature with high humid-ity, the acid value of the solvent extracted crude rice bran oil increased greatly for the moldy and rancidi-ty of rice bran, in the same time, its peroxide value reduced, its color became dark brown with unpleas-ant mildew,the pigments were hard to be removed from the oil and its color could not reach the require-ment of the fourth grade rice bran oil of national standard even if the dosage of activated clay was 13% in the process of adsorption bleaching.