可食用全息图有一天可以装饰食物

标签:可食用,食用,全息,全息图,有一天,一天,可以,装饰  2021-2-20 9:11:24  预览

  

全息图无处不在,从驾照到名誉卡再到产品包装。而如今,可食用全息图有一天可以加强食物。发表在ACS Nano杂志上的研究人员开发了一种基于激光的方法,可以在干燥的玉米糖浆薄膜上打印纳米结构全息图。研究人员说八字合婚,这种可食用全息图还可用于确保食品安全、标记产品或指示含糖量。

大多数全息图都是用激光印在金属外观,如铝上,但这些材料是不可食用的。对于食品,人们提出了用纳米颗粒制作全息图,但是这些细小的颗粒会产生活性氧,这可能对人们的饮食有害。食品科学家用另一种方法将可食用全息图模制到巧克力上,但这一过程只适用于某些类型的糖果,每个全息图设计都必要不同的模子。Bader AlQattan、Haider Butt和同事们盼望找到一种安全、快速和多功能的方法,将可食用全息图绘制到各种食物上。

为了发展他们的方法,研究人员将玉米糖浆、香草和水制成溶液北京人事考试网站,并将其干燥成薄膜。他们在薄膜上涂了一层无毒的黑色染料。然后,他们使用一种称为直接激光干涉图案化的技术来蚀刻大部分染料,留下突出的纳米级线条,形成衍射光栅。当受到光的照射时网络营销策划,纳米结构将光衍射成彩虹图案,在不同的视角出现不同的颜色。研究小组可以通过改变光栅中的线间距或玉米糖浆膜的含糖量来控制颜色的强度和范围。然而,在食用全息图即将上架之前,研究人员盼望将这种方法应用于一种食品级染料西安人事考试,这种染料可以庖代这些试验中使用的合成黑色染料

Journal Reference:

  1. Bader AlQattan, Joelle Doocey, Murad Ali, Israr Ahmed, Ahmed E. Salih, Fahad Alam, Magdalena Bajgrowicz-Cieslak, Ali K. Yetisen, Mohamed Elsherif, Haider Butt. Direct Printing of Nanostructured Holograms on Consumable Substrates. ACS Nano, 2021; DOI: 10.1021/acsnano.0c02438

Cite This Page:

American Chemical Society. "Edible holograms could someday decorate foods." ScienceDaily. ScienceDaily, 17 February 2021. <www.sciencedaily.com/releases/2021/02/210217151136.htm>. American Chemical Society. (2021, February 17). Edible holograms could someday decorate foods. ScienceDaily. Retrieved February 18, 2021 from www.sciencedaily.com/releases/2021/02/210217151136.htm American Chemical Society. "Edible holograms could someday decorate foods." ScienceDaily. www.sciencedaily.com/releases/2021/02/210217151136.htm (accessed February 18, 2021).

Holograms are everywhere, from driver's licenses to credit cards to product packaging. And now, edible holograms could someday enhance foods. Researchers reporting in ACS Nano have developed a laser-based method to print nanostructured holograms on dried corn syrup films. The edible holograms could also be used to ensure food safety, label a product or indicate sugar content, the researchers say.

Most holograms are imprinted with lasers onto metal surfaces, such as aluminum, but the materials aren't edible. For foods, holograms made with nanoparticles have been proposed, but the tiny particles can generate reactive oxygen species, which might be harmful for people to eat. In a different approach, food scientists have molded edible holograms onto chocolate, but the process only works for certain types of the confection, and a different mold is needed for each hologram design. Bader AlQattan, Haider Butt and colleagues wanted to find a safe, fast and versatile way to pattern edible holograms onto a variety of foods.

To develop their method, the researchers made a solution of corn syrup, vanilla and water and dried it into a thin film. They coated the film with a fine layer of non-toxic black dye. Then, they used a technique called direct laser interference patterning to etch off most of the dye, leaving behind raised, nanoscale lines that formed a diffraction grating. When struck by light, the nanostructure diffracted the light into a rainbow pattern, with different colors appearing at different angles of viewing. The team could control the intensity and range of colors by varying the spacing between lines in the grating or the sugar content of the corn syrup film. Before edible holograms are ready to hit store shelves, however, the researchers want to adapt the method to a food-grade dye that could replace the synthetic black dye used in these pilot experiments.

Journal Reference:

  1. Bader AlQattan, Joelle Doocey, Murad Ali, Israr Ahmed, Ahmed E. Salih, Fahad Alam, Magdalena Bajgrowicz-Cieslak, Ali K. Yetisen, Mohamed Elsherif, Haider Butt. Direct Printing of Nanostructured Holograms on Consumable Substrates. ACS Nano, 2021; DOI: 10.1021/acsnano.0c02438

Cite This Page:

American Chemical Society. "Edible holograms could someday decorate foods." ScienceDaily. ScienceDaily, 17 February 2021. <www.sciencedaily.com/releases/2021/02/210217151136.htm>. American Chemical Society. (2021, February 17). Edible holograms could someday decorate foods. ScienceDaily. Retrieved February 18, 2021 from www.sciencedaily.com/releases/2021/02/210217151136.htm American Chemical Society. "Edible holograms could someday decorate foods." ScienceDaily. www.sciencedaily.com/releases/2021/02/210217151136.htm (accessed February 18, 2021).