Identification and quantification of free, esterified, and insoluble-bound phenolics in grains of hulless barley varieties and their antioxidant activities

Junlin Deng, Zhuoya Xiang, Changbin Lin, Yongqing Zhu, Kaijun Yang, Tinghui Liu, Xia Chen, Jian Chen, Wenhui Zhang, Yuhong Zhang, Boyu Zhu