title: Identification and quantitation of phenolic compounds from the seed and pomace of Perilla frutescens using HPLC/PDA and HPLC-ESI/QTOF/MS/MS.
abstract: BACKGROUND
  Perilla frutescens (L.) Britt., an essential traditional Asian crop and Chinese medicine, potentially exerts anti-oxidation effects through its phenolic compounds. These compounds have already been reported in perilla seed, however, little is reported in Perilla pomace, the primary waste during oil production of Perilla seed.
  
  
  OBJECTIVE
  To investigate major phenolic compounds in perilla seeds and pomaces in order to check whether the pomace could be an alternative resource to the seed for nutritional and medical purposes.
  
  
  METHODS
  Compounds in extracts of perilla seeds and pomaces were separated by high-performance liquid chromatography and detected by photodiode array, and by electrospray ionisation with quadrupole time-of-flight tandem mass spectrometry. Herb-markers selected by principal components analysis were then quantified in both seeds and pomaces. Moreover, a fingerprinting approach and multiple discriminant analysis were applied to screen the phenolic markers in 22 samples.
  
  
  RESULTS
  Ten phenols were tentatively identified, among which four (rosmarinic acid, luteolin, apigenin and rosmarinic acid-3-O-glucoside) were selected as herb-markers. Perilla seeds and pomaces showed similar phenol profiles, however, the pomaces contained almost two times the amount of the four herb-markers than the seeds.
  
  
  CONCLUSIONS
  The results indicated perilla pomace is a promising alternative source of phenolic compounds that could be recovered and potentially used as natural anti-oxidants.
authors.affiliation: Institute of Quality Standards and Testing Technology for Agro-products, Key Laboratory of Agro-product Quality and Safety, Chinese Academy of Agricultural Sciences; Key Laboratory of Agro-food Quality and Safety, Ministry of Agriculture, Beijing, 100081, China.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Guan
authors.forename: Sicong
authors.initials: S
authors.lastname: Li
authors.forename: Zongtao
authors.initials: Z
authors.lastname: Lin
authors.forename: Ruinan
authors.initials: R
authors.lastname: Yang
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhao
authors.forename: Jinchuan
authors.initials: J
authors.lastname: Liu
authors.forename: Shuming
authors.initials: S
authors.lastname: Yang
authors.forename: Ailiang
authors.initials: A
authors.lastname: Chen
mesh_terms: D047310:Apigenin / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification; D015415:Biomarkers / Q000032:analysis / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D002934:Cinnamates / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification; D053630:Depsides / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification; D005960:Glucosides / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification; D047311:Luteolin / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification; D031344:Perilla frutescens / Q000737:chemistry*; D010636:Phenols / Q000032:analysis / Q000737:chemistry* / Q000302:isolation & purification; D010936:Plant Extracts / Q000032:analysis / Q000737:chemistry* / Q000302:isolation & purification; D010946:Plants, Medicinal; D012639:Seeds / Q000737:chemistry*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods; D053719:Tandem Mass Spectrometry / Q000379:methods; D000097123:Rosmarinic Acid
chemical_list: D047310:Apigenin; D015415:Biomarkers; D002934:Cinnamates; D053630:Depsides; D005960:Glucosides; D047311:Luteolin; D010636:Phenols; D010936:Plant Extracts; D000097123:Rosmarinic Acid
keywords: HPLC-MS; fingerprint; perilla pomace; perilla seed; phenolic compounds