蔓越莓汁的反渗透和正向渗透浓度:加工对果汁品质的影响

Mark Emile H. Punzalan and Olga I. Padilla-Zakour
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引用次数: 0

摘要

反渗透(RO)和正向渗透(FO)是替代热蒸发的膜过程,在液体食品浓缩过程中在室温或更低的温度下操作,使用更少的能量并保留热不稳定的成分。巴氏杀菌后的蔓越莓汁(5.5°白利度,pH 2.6)在3.5 MPa和25°C的条件下用RO浓缩至17.8°白利度,然后在25°C的条件下用FO浓缩至52.3°白利度。柠檬酸钾(2.35 mol L−1)作为萃取液。样品在4℃下冷藏6个月。在加工前后和6个月的时间里,对浓缩和/或重构的样品进行了总可溶性固形物、pH、水活度、可滴定酸度、柠檬酸和苹果酸、CIE色、%聚合色、总酚类物质、类黄酮、单体花青素、DPPH和ABTS抗氧化活性的测定。对浓缩样品在加工前、加工后以及1、3、6个月后的培养皿总数、酵母总数和霉菌总数进行评估。结果表明,在反渗透过程中,花青素含量降低了4%,而FO对花青素理化性质无显著影响(p > 0.05)。在贮藏过程中,RO + FO浓缩物的颜色值显著降低(p < 0.05), 6个月时总颜色变化(ΔE)为10.4±0.9。6个月后,聚合物颜色增加了2倍,花青素和DPPH Trolox分别减少了57%和23%。总酚类物质、总黄酮和ABTS抗氧化活性在RO和FO处理后以及贮存时间内均有保留。培养皿总计数为<;1.5 log CFU mL−1。未检测到酵母菌和霉菌。研究结果表明,反硝化和氧化油复合处理可以生产出高品质的蔓越莓浓缩汁,该浓缩汁保留了品质属性和生物活性成分,但可能需要冷冻保存以保存花青素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Reverse osmosis and forward osmosis concentration of cranberry juice: processing effects on juice quality

Reverse osmosis and forward osmosis concentration of cranberry juice: processing effects on juice quality

Reverse (RO) and forward osmosis (FO) are membrane processes that are alternatives to thermal evaporation, operating at room or lower temperature during concentration of liquid foods, using less energy and retaining heat-labile components. Pasteurized cranberry juice (5.5° Brix, pH 2.6) was concentrated by RO at 3.5 MPa and 25 °C to 17.8° Brix and further concentrated by FO at 25 °C to 52.3° Brix. Potassium citrate (2.35 mol L−1) was used as FO draw solution. Samples were stored refrigerated at 4 °C for 6 months. Total soluble solids, pH, water activity, titratable acidity, citric and malic acids, CIE color, % polymeric color, total phenolics, flavonoids, monomeric anthocyanins, DPPH and ABTS antioxidant activities were measured on concentrated and/or reconstituted samples before and after processing and monthly for 6 months. Total plate and yeast and mold counts were evaluated before and after FO processing and after 1, 3, and 6 months on concentrated samples. Results showed that during RO, anthocyanins decreased by 4% while FO induced no significant changes (p > 0.05) in the physicochemical properties. During storage, color values in the RO + FO concentrate decreased significantly (p < 0.05), with a total color change (ΔE) of 10.4 ± 0.9 at the end of 6 months. Polymeric color increased 2-fold while anthocyanins and DPPH Trolox equivalents decreased by 57% and 23% respectively after 6 month storage. Total phenolics, flavonoids and ABTS antioxidant activity were retained after RO and FO and through storage time. Total plate count was <1.5 log CFU mL−1 before and after FO processing and after storage. No yeast and molds were detected. These findings suggested that a combined RO + FO can produce high-quality cranberry juice concentrate that retains quality attributes and bioactive components but may need frozen storage for preservation of anthocyanins.

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