Our previous study revealed that gamma-aminobutyric acid (GABA) in Earl's muskmelon is more concentrated in the inner than the outer parts of the fruit. Here, the GABA and antioxidant capacity of the placental tissue of muskmelon, which is considered waste, were evaluated for possible use as a source of bioactive compounds. The concentrations of GABA and related substances in the placental tissue were significantly higher than in the fleshed pulp, whereas glutamic acid and sugar levels were significantly lower. The two sites showed no difference in GAD activity. Furthermore, the placental site showed high antioxidant capacities based on 2,2-diphenyl-1-picrylhydrazyl and oxygen radical absorbance capacity for hydrophilic compounds assays compared with the fleshed pulp, because of the higher levels of total phenolic and L-ascorbic acids. Therefore, the placental tissue of muskmelons may be useful for developing functional foods, which would also reduce the amount of residues during muskmelon processing.

中文翻译：

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温室甜瓜（Cucumis melo L.）的胎盘组织比肉浆含有更多的具有抗氧化能力的γ-氨基丁酸。

我们以前的研究表明，伯爵甜瓜中的γ-氨基丁酸（GABA）集中在果实的内部，而不是果实的外部。在这里，对被认为是废物的甜瓜的胎盘组织的GABA和抗氧化能力进行了评估，以用作生物活性化合物的来源。胎盘组织中GABA和相关物质的浓度显着高于肉肉中的浓度，而谷氨酸和糖的含量则显着降低。这两个位点显示GAD活性无差异。此外，胎盘部位显示出较高的抗氧化能力（基于2,2-二苯基-1-吡啶并肼基），并且与肉肉相比，亲水性化合物测定的氧自由基吸收能力强，这是因为总酚和L-抗坏血酸含量较高。