Shanta Faria Hossain, Rahut Barun Kumar, Islam Md Jahirul, Azad Md Obyedul Kalam, Sohel Md Abu Taher, Rajib Md Rashedur Rahman, Shams-Ud-Din Md, Adnan Md
Physiology and Sugar Chemistry Division, Bangladesh Sugarcrop Research Institute, Ishurdi-6620, Pabna, Bangladesh.
Department of Food Technology and Rural Industries, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.
Heliyon. 2021 Nov 3;7(11):e08322. doi: 10.1016/j.heliyon.2021.e08322. eCollection 2021 Nov.
The high decaying tendency of date palm juice limited its manifold application. Here, we developed a preservation technique for concentrated juice and formulated ready to serve (RTS) drinks. The collected date palm juice was heated at 85 °C for 5 min; scum was removed and preserved in the sterilized glass bottle. After that, this pasteurized juice was concentrated to 9%, 12%, 15%, 18% and 21% total soluble solids (TSS) levels and treated with 200 ppm of potassium metabisulfite (KMS) and stored at refrigerated temperature (4 °C). Among them, 18% TSS showed overall acceptability to sensory evaluations for colour, flavour, sweetness, TSS, acidity and microbial load. In contrast, heat treated date palm juice (9% TSS) was used to formulate RTS drinks containing 10%, 20%, 30% and 40% date palm juice, were preserved in sterilized bottles and stored at 30 °C. Results showed that RTS drinks containing 30% date palm juice secured the best colour, flavour, sweetness, TSS, acidity, microbial load and overall acceptability. Furthermore, no significant change was observed in TSS, acidity, microbial load up to three and six months for concentrated juice and RTS drinks, respectively.
枣椰汁的高腐败倾向限制了其多种应用。在此，我们开发了一种浓缩汁的保存技术，并配制了即饮（RTS）饮料。将收集到的枣椰汁在85°C下加热5分钟；去除浮沫并保存在消毒过的玻璃瓶中。之后，将这种巴氏杀菌后的果汁浓缩至总可溶性固形物（TSS）含量为9%、12%、15%、18%和21%，并用200 ppm的焦亚硫酸钾（KMS）处理，然后在冷藏温度（4°C）下储存。其中，18% TSS的浓缩汁在颜色、风味、甜度、TSS、酸度和微生物负荷的感官评价中表现出总体可接受性。相比之下，将热处理后的枣椰汁（9% TSS）用于配制含10%、20%、30%和40%枣椰汁的RTS饮料，保存在消毒瓶中并在30°C下储存。结果表明，含30%枣椰汁的RTS饮料在颜色、风味、甜度、TSS、酸度、微生物负荷和总体可接受性方面表现最佳。此外，浓缩汁和RTS饮料的TSS、酸度、微生物负荷在分别长达三个月和六个月的时间内未观察到显著变化。
