Abstract:In the present paper, orthogonal design test was planed by changing cinefaction temperature, cinefaction time, and the concentration of hydrochloric acid. Yak milk powder and milk powder were digested by dry method. The contents of elements Ca, Mg, Fe, Cu, Zn, Mn, K and Na were determined by flame atomic absorption spectrometry. The best conditions for the digestion were obtained as follows: the temperature was 510 ℃, cinefaction time 4 hours, and hydrochloric acid concentration 1∶5. Meanwhile, under the best experimental conditions, the recovery ratio of the method in the range of 95.2%-107.3%, and the relative standard deviations were 0.38%-3.86% (n=6). The experimental results proved that Yak milk powder is valuable and nutritious food, and has rich nutrition elements.
[1] JI Qiu-mei, PU Qiong, DA Wa-yangla(姬秋梅,普 穷,达娃央拉). Journal of Gansu Agricultural University(甘肃农业大学学报),2000,35(3):269. [2] GAN Zhi-yong, PENG Jing-ru(甘志勇,彭靖茹). Studies of Trace Elements and Health(微量元素与健康研究),2007,24(1):46. [3] HUO Jian-zhong, CHEN Hong, WANG Zhen-ying(霍建中,陈 宏,王振英). Food and Fermentation Industries(食品与发酵工业),2004,30(2):126. [4] LIU Jiang-hui, ZHOU Hua(刘江晖,周 华). Food Science(食品科学),2003,24(11):113. [5] ZHANG Sheng-bang, ZHANG Xue-jun, GUO Yu-sheng(张胜帮,张学俊,郭玉生). Spectroscopy and Spectral Analysis(光谱学与光谱分析),2004,24(10):1260. [6] WANG Xiu-min, CHEN Yan-chang, XIE Ling-qin, et al(王秀敏,陈彦昌,谢令琴, 等). Spectroscopy and Spectral Analysis(光谱学与光谱分析),2004,24(11):1467. [7] CHI Xi-zeng(迟锡增). Trace Element and Health of Human Body(微量元素与人体健康). Beijing: Chemical Industry Press(北京:化学工业出版社), 1997. [8] WANG Ying, XIN Shi-gang(王 莹,辛士刚). Spectroscopy and Spectral Analysis(光谱学与光谱分析),2004,24(11):1253. [9] China Prophylaxis Academy,Nutrition and Food Hygiene Institution(中国预防医学科学院,营养与食品卫生研究所编). Food Ingredients Table(食物成分表). Beijing: People’s Medical Publishing House Health Press(北京:人民卫生出版社),1991. 36.