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ObjectiveThe aim of this study was to assess period prevalence and risk factors of peripartum depression in South Korean women.MethodsTwo thousand four hundred and forty-nine women in their first trimester of pregnancy were recruited, 1355 women were followed to the end of the study (1 month after delivery), 423 women are before the 1 month after delivery, 671 were dropped out. There were four time points of assessment – 12, 24, 36 weeks of gestation and 1 month after delivery. Depressive symptoms were assessed using the validated Korean version of the Edinburgh Postnatal Depression Scale. Risk factors were assessed across the demographic features, past histories, obstetric histories, and psychological status.ResultsThe prevalence of peripartum depressive symptoms (above 10 points of K-EPDS) was found to be 18.8% at 1st trimester, 12.9% at 2nd trimester, 12.6% at 3rd trimester, and 15.7% at 1 month after delivery. Identified risk factors of depression at 1st trimester were unmarried status, employed status, low family income, familial history and past history of depression, multigravida, unplanned pregnancy, hyperemesis, and threatened abortion. In psychological aspects, higher distress, lower marriage satisfaction, and lower quality of life increased the risk of depression. The analyses to identify risk factors of postpartum depression will be performed after the deliveries of recruited mothers are complete.ConclusionA substantial proportion of mothers suffered from peripartum depression from their early pregnancy in Seoul, Korea. Intervention based on identified risk factors would be recommended to help depressive pregnant mothers.Disclosure of interestThe authors have not supplied their declaration of competing interest.

Upcycling low‐valued materials and/or biobased wastes is a promising method to produce materials in an energy‐saving, sustainable way. Lignin is one of the underutilized biomasses and has been produced as a byproduct in paper‐making industry. Upcycling lignin into valuable products is key to solving problems associated with waste disposal, environmental pollution, and depletion of natural resources. One way to add values to lignin and its derivatives is to utilize them as sensors and adsorbents, in which toxic elements and materials can be detected and removed. In this review, we highlight the utility of lignin in the field of sensing and adsorbing metal ions. This review begins with the general overview of lignin as materials, followed by investigation of lignin and its derivatives in the detection and removal of metal ions. Lastly, we end this review with the prospects of lignin as sensors and adsorbents.