Chen Chen, Zhang Min, Mujumdar Arun S, Phuhongsung Pattarapon
State Key Laboratory of Food Science and Technology, Jiangnan University, 214122 Wuxi, Jiangsu, China; International Joint Laboratory on Food Safety, Jiangnan University, 214122 Wuxi, Jiangsu, China.
State Key Laboratory of Food Science and Technology, Jiangnan University, 214122 Wuxi, Jiangsu, China; Jiangsu Province Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Jiangnan University, 214122 Wuxi, Jiangsu, China.
Food Res Int. 2021 Oct;148:110630. doi: 10.1016/j.foodres.2021.110630. Epub 2021 Jul 28.
The feasibility was investigated of 4D printing of lotus root gel compounded with a pigment that responds to pH change and alters colour. The pigment comprised of a combination of anthocyanins and lemon yellow; it was used in gel preparation for printing. The flowability and self-support properties of the lotus root-pigment gel were studied to evaluate its 3D printing performance. The gel viscosity decreased with the increase of printing temperature over the range 40, 50, and 60 °C. The gel with a ratio (lotus root powder/compound pigment) of 0.35 extruded smoothly and maintained high formability at temperatures below 60 °C. The pH response of compound pigment enabled the printed sample to change colour from reddish/yellowish to green after spraying with NaHCO. The a* and b* values decreased significantly (p < 0.05) after spraying for 1 min. The gel with ratios of 0.30 and 0.35 achieved rapid colour change both superficially and internally. Through several different model designs (apple, Christmas tree, letters, and Chinese characters), high-quality 4D printing could be realized without problem. Thus, lotus root gel can be mixed with suitable pigments in correct proportion for 4D printing at appropriate temperature to ensure good flowability.
研究了与对pH变化有响应并改变颜色的颜料复合的莲藕凝胶进行4D打印的可行性。该颜料由花青素和柠檬黄的组合组成；用于凝胶制备以进行打印。研究了莲藕-颜料凝胶的流动性和自支撑性能，以评估其3D打印性能。在40、50和60℃范围内，凝胶粘度随打印温度的升高而降低。莲藕粉/复合颜料比例为0.35的凝胶在60℃以下温度下挤出顺畅并保持高成型性。复合颜料的pH响应使打印样品在喷洒NaHCO后从微红/微黄变为绿色。喷洒1分钟后，a和b值显著降低（p<0.05）。比例为0.30和0.35的凝胶在表面和内部都实现了快速变色。通过几种不同的模型设计（苹果、圣诞树、字母和汉字），可以毫无问题地实现高质量的4D打印。因此，莲藕凝胶可以在适当温度下与合适的颜料按正确比例混合用于4D打印，以确保良好的流动性。
