乳品营养与人类健康

今年６月，２０００北京国际奶业大会在京召开，会上由中国预防医学科学院营养与食品卫生研究所教授、中国营养学会妇幼营养学会副主任委员刘冬生教授作了专题报告，使与会者对乳品的营养价值有了全面。

加快推动乳制品向生活必需品转型的做法与经验

2022年以来,受新冠疫情和经济下行双重影响,我国奶业发展呈现阶段性过剩,在苜蓿、豆粕等饲料成本不断上涨的情况下,生鲜乳实际收购价格逐步下降,奶牛养殖两头承压,乳品企业面临消费需求不振与奶源消化压力持续加大的困境。我国居民乳品消费量不足,是全面进入小康阶段后,制约居民膳食营养改善的一个短板。如何快速提升消费、实现乳品向生活“必需品”转变,不仅对稳定奶业发展意义重大,长期也是推动奶业高质量发展、助力国民健康的重要抓手。

恒天然上海研发中心开幕

【本刊讯】2012年5月17日,新西兰恒天然集团宣布上海研发中心正式开幕。恒天然上海研发中心的成立作为集团战略的一部分,将有助于满足中国快速增长的对高品质乳品营养的需求。

Nutritional evaluation of caseins and whey proteins and their hydrolysates from Protamex

Whey protein concentrate (WPC 80) and sodium caseinate were hydrolyzed by Protamex to 5%, 10%, 15%, and 20% degree of hydrolysis (DH). WPC 80, sodium caseinate and their hydrolysates were then analyzed, compared and evaluated for their nutritional qualities. Their chemical composition, protein solubility, amino acid composition, essential amino acid index (EAA index), biological value (BV), nutritional index (NI), chemical score, enzymic protein efficiency ratio (E-PER) and in vitro protein digestibility (IVPD) were determined. The results indicated that the enzymatic hydrolysis of WPC 80 and sodium caseinate by Protamex improved the solubility and IVPD of their hydrolysates. WPC 80, sodium caseinate and their hydrolysates were high-quality proteins and had a surplus of essential amino acids compared with the FAO/WHO/UNU (1985) reference standard. The nutritive value of WPC 80 and its hydrolysates was superior to that of sodium caseinate and its hydrolysates as indicated by some nutritional parameters such as the amino acid composition, chemical score, EAA index and predicted BV. However, the E-PER was lower for the WPC hydrolysates as compared to unhydrolyzed WPC 80 but sodium caseinate and its hydrolysates did not differ significantly. The nutritional qualities of WPC 80, sodium caseinate and their hydrolysates were good and make them appropriate for food formulations or as nutritional supplements.