Production of phenylalanine-reduced soymilk for phenylketonuria patients

Yasemin Taşdemir, E. Gölge
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Abstract

Phenylketonuria (PKU) is a hereditary disease caused by the deficiency of phenylalanine (Phe) hydroxylase enzyme or its cofactor tetrahydrobiopterin. Treatment involves a Phe-restricted diet, although food options are limited. Soymilk, derived from soybeans, is a functional food with nutritional benefits. In this study, soymilk was produced and hydrolyzed with protease of Aspergillus oryzae and papain, and then activated carbon was used to remove Phe for PKU patients. The second-derivative spectrophotometry method was used to determine Phe content in soymilk. The results showed no significant difference in dry matter, fat, and crude fiber between soymilk and Phe-extracted soymilk with respect to the control group (P < 0.05). Soymilk’s protein content was calculated as 2.74% (w/w) and that of Phe-reduced soymilk as 1.94% (w/w). Similarly, consecutive Phe content was 40.53 mg/L and 5.09 mg/L. After hydrolization, the calculated Phe removal rate was 87.44% (w/w), and the protein content was reduced by 29.19% (w/w). The study demonstrates that Phe-reduced soymilk is suitable for PKU patients, thus reducing the need for imported products and offering new market opportunities.
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为苯丙酮尿症患者生产苯丙氨酸还原豆浆
苯丙酮尿症(PKU)是一种因缺乏苯丙氨酸(Phe)羟化酶或其辅助因子四氢生物蝶呤而引起的遗传性疾病。治疗方法包括限制 Phe 摄入,但可供选择的食物有限。从大豆中提取的豆浆是一种具有营养价值的功能性食品。本研究用黑曲霉蛋白酶和木瓜蛋白酶水解豆浆,然后用活性炭去除PKU患者体内的Phe。采用二次衍生分光光度法测定豆浆中的 Phe 含量。结果表明,与对照组相比,豆浆和去酚豆浆的干物质、脂肪和粗纤维没有明显差异(P < 0.05)。经计算,豆浆的蛋白质含量为 2.74%(重量比),而 Phe 还原豆浆的蛋白质含量为 1.94%(重量比)。同样,连续的 Phe 含量分别为 40.53 毫克/升和 5.09 毫克/升。水解后,计算得出的 Phe 去除率为 87.44%(重量比),蛋白质含量降低了 29.19%(重量比)。这项研究表明,Phe 还原豆浆适用于 PKU 患者,从而减少了对进口产品的需求,并提供了新的市场机遇。
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