Scholarlink

<p>Betalain, a natural pigment found in red dragon fruit, has been proposed as a natural reagent for metal detection. In the present study, this pigment was extracted and used as a colorimetric reagent for Cu and Fe on a paper-based analytical device (PAD) and then applied to water samples. The extract was stable at 5 <i>±</i> 3&#xa0;°C for 16 weeks. In a solution with a pH of 4–5, the betalain extract changed color from pink to light orange (Cu) and yellow (Fe) and was selective against Na, K, Ca, Ba, Al, Mg, Zn, Hg, Ni, and Pb. The color change was caused by a metal–betalain complex with an estimated ratio of 1:2 (Cu–betalain) and 1:9 (Fe–betalain). Betalain PAD was produced under optimal conditions using Whatman CF1 paper containing 20 µL of 100&#xa0;mg/mL betalain extract at pH 4–5. This process resulted in a limit of quantification of 3.133&#xa0;mg/L (Cu) and 4.736&#xa0;mg/L (Fe) and a limit of detection of 1.034&#xa0;mg/L (Cu) and 1.563&#xa0;mg/L (Fe). Based on these findings, betalain PAD made from red dragon fruit could be a viable alternative for the on-site detection of Cu and Fe in water. Ultimately, betalain PAD is a toxic waste-free, portable, fast, and prospective on-site tool for metal detection.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Development of paper based colorimetric method using pigment from red dragon fruit for determination of Cu and Fe

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年4月19日

查看全文
  • Rimadani Pratiwi,
  • Raspati Dewi Mulyaningsih,
  • Aliya Nur Hasanah

摘要

Betalain, a natural pigment found in red dragon fruit, has been proposed as a natural reagent for metal detection. In the present study, this pigment was extracted and used as a colorimetric reagent for Cu and Fe on a paper-based analytical device (PAD) and then applied to water samples. The extract was stable at 5 ± 3 °C for 16 weeks. In a solution with a pH of 4–5, the betalain extract changed color from pink to light orange (Cu) and yellow (Fe) and was selective against Na, K, Ca, Ba, Al, Mg, Zn, Hg, Ni, and Pb. The color change was caused by a metal–betalain complex with an estimated ratio of 1:2 (Cu–betalain) and 1:9 (Fe–betalain). Betalain PAD was produced under optimal conditions using Whatman CF1 paper containing 20 µL of 100 mg/mL betalain extract at pH 4–5. This process resulted in a limit of quantification of 3.133 mg/L (Cu) and 4.736 mg/L (Fe) and a limit of detection of 1.034 mg/L (Cu) and 1.563 mg/L (Fe). Based on these findings, betalain PAD made from red dragon fruit could be a viable alternative for the on-site detection of Cu and Fe in water. Ultimately, betalain PAD is a toxic waste-free, portable, fast, and prospective on-site tool for metal detection.