5.4 微塑膠(Microplastics)與光降解
塑膠在紫外線(UV)照射下會發生光氧化降解,導致表面粉化(Chalking),進而剝落微塑膠顆粒進入食品 41。
風險管理: 戶外發酵或置於窗邊的透明/半透明桶風險最高。
對策: HDPE 發酵桶應添加食品級炭黑(Carbon Black)或鈦白粉(Titanium Dioxide)作為光遮蔽劑(這也是為何工業桶多為藍色或黑色的原因),且必須嚴格放置於室內避光處。
第六章 實務操作指南與最佳化流程
基於上述科學分析與法規要求,本報告為業者制定一套標準操作程序(SOP),以確保在合規與安全的前提下進行生產。
6.1 容器採購規範(Procurement SOP)
材質鎖定: 僅採購 HDPE (2) 或 PP (5) 材質。
食品級認證: 供應商必須提供該批次產品的 「食品容器具檢驗證明書」。
檢驗項目需包含:材質試驗(鉛、鎘)、溶出試驗(4% 醋酸, 60°C/30min, 蒸發殘渣 < 30ppm)。
注意報告日期應在一年內,且檢體照片與實物相符。
標示檢查: 桶身或外包裝必須有 「酒杯與叉子」 符號或 「供食品接觸用途」 字樣 43。
拒絕回收桶: 採購合約應註明「保證全新品(Virgin Material)」,嚴禁使用二手桶。
6.2 發酵環境與製程管理
溫度控制(Temperature Control):
建議發酵室溫度控制在 20°C - 28°C。避免超過 30°C,以降低化學物質遷移速率並防止諾麗果風味劣化(高溫易產生過多雜醇油) 14。
避免溫差劇烈波動,以防桶內產生負壓或過壓,導致變形或吸入外部污染物。
避光儲存: 塑膠桶應放置於無陽光直射的陰涼處。若無法完全避光,應使用不透光的 HDPE 桶(如藍色或黑色),而非半透明的 PP 桶。
清洗與消毒(CIP):
塑膠表面硬度不如不鏽鋼,易被刷洗造成刮痕。建議使用高壓水槍或軟海綿清洗,嚴禁使用鋼刷。刮痕會藏汙納垢並增加與酸液的接觸面積 46。
消毒可使用食品級酒精或次氯酸水,但需確保沖洗乾淨。
6.3 生命週期管理
塑膠容器並非永久耐用。建議業者建立履歷制度:
啟用日期標籤: 每個發酵桶在使用首日貼上防水標籤,記錄啟用日期。
定期巡檢: 每半年檢查桶內壁狀況。若發現 變色(黃變)、內壁粗糙化(粉化)、細微裂紋 或 異味殘留,應立即淘汰。
強制退役: 建議高酸性發酵用途的塑膠桶使用年限不超過 3-5年(視使用頻率與清洗強度而定),之後可降級用於盛裝非食品物質或回收。
6.4 替代方案評估
雖然 HDPE 桶合規且成本低,但對於追求頂級定位的品牌,可考慮「混合材質策略」:
前發酵(液化期): 使用 HDPE 桶,方便搬運與觀察。
後陳釀(長期): 轉移至 304 或 316L 食品級不鏽鋼桶。不鏽鋼對酸、醇及時間的抵抗力是絕對的,且無遷移風險,能作為高價產品的品質保證。
第七章 結論
綜合材料科學、化學遷移研究及台灣法規的深入分析,本報告得出以下結論:
合規性確認: 在台灣使用 符合食品器具容器包裝衛生標準 的 HDPE (2號) 或 PP (5號) 塑膠桶進行諾麗果發酵,在法律上是 完全合規 的。前提是該容器必須通過 4% 醋酸溶出試驗,並具有正確的中文標示。
科學安全性: HDPE 與 PP 的碳氫骨架結構賦予其優異的耐酸性與化學惰性,能夠抵禦諾麗果發酵液(pH 3.5, 微量酒精)的侵蝕。與 PVC(塑化劑風險)及 PET(銻溶出風險)相比,HDPE/PP 是長期發酵最安全的塑膠選擇。
關鍵風險控制點: 安全的關鍵在於 「拒絕二手桶」 與 「溫度管理」。絕大多數的塑化劑污染案例皆源自誤用盛裝過化學品的工業回收桶。此外,控制發酵溫度在 30°C 以下,能最大程度降低任何潛在的物質遷移風險。
產業建議: 建議業者將容器的合規證明(SGS報告)納入食品安全管制系統(HACCP/ISO 22000)的供應商管理環節,並建立容器汰換機制。這不僅是為了應對法規稽查,更是對消費者健康負責的具體展現。
附表:常見塑膠材質特性與諾麗果發酵適用性速查表
(報告結束)
引用的著作
祖母綠諾麗果酵素, 檢索日期:12月 14, 2025, http://www.emerald-noni.url.tw/%E8%AB%BE%E9%BA%97%E9%85%B5%E7%B4%A0/
Research Progress on Nutritional Properties of Noni (Morinda citrifolia L.) Fruit and Its Fermented Foods - MDPI, 檢索日期:12月 14, 2025, https://www.mdpi.com/2311-5637/11/7/358
CN101791139A - 一种基于诺丽果发酵汁降血糖或血压的液体组合物及制备方法, 檢索日期:12月 14, 2025, https://patents.google.com/patent/CN101791139A/zh
Polypropylene vs. HDPE: Material Differences and Comparisons - Xometry, 檢索日期:12月 14, 2025, https://www.xometry.com/resources/materials/polypropylene-vs-hdpe/
PP or HDPE, A Guide in Plastic Buckets Manufacturing - Innopack, 檢索日期:12月 14, 2025, https://www.innopack.com/pp-or-hdpe-a-guide-in-plastic-buckets-manufacturing/
Postharvest ripening of noni fruit (Morinda citrifolia) and the microbial and chemical properties of its fermented juice - Publication : USDA ARS, 檢索日期:12月 14, 2025, https://www.ars.usda.gov/research/publications/publication/?seqNo115=290762
利用乳酸菌發酵諾麗果(Morinda citrifolia L.) 果汁__臺灣博碩士論文知識加值系統, 檢索日期:12月 14, 2025, https://ndltd.ncl.edu.tw/cgi-bin/gs32/gsweb.cgi/login?o=dnclcdr&s=id=%22104NPUS5252002%22.&searchmode=basic
Effects of Sonication and Thermal Pasteurization on the Nutritional, Antioxidant, and Microbial Properties of Noni Juice - PMC - NIH, 檢索日期:12月 14, 2025, https://pmc.ncbi.nlm.nih.gov/articles/PMC9822281/
Sugars, Organic Acids, and Alcohol Composition of Noni Fruit Exudate... - ResearchGate, 檢索日期:12月 14, 2025, https://www.researchgate.net/figure/Sugars-Organic-Acids-and-Alcohol-Composition-of-Noni-Fruit-Exudate-during-28-Days-of_tbl1_274265933
食品器具容器包裝衛生標準修正條文對照表 - 衛生福利部, 檢索日期:12月 14, 2025, https://www.mohw.gov.tw/dl-81750-3b60844e-77bc-4650-bceb-c0b866a24b55.html
Polyethylene Chemical Resistance Chart - CDF Corporation, 檢索日期:12月 14, 2025, https://www.cdf1.com/technical%20bulletins/Polyethylene_Chemical_Resistance_Chart.pdf
Polyethylene chemical resistance - Braskem, 檢索日期:12月 14, 2025, https://www.braskem.com.br/Portal/Principal/Arquivos/html/boletm_tecnico/PE%20Chemical%20Resistance.pdf
Chemical Compatibility Chart - LDPE, HDPE, PP, Teflon Resistance - CP Lab Safety, 檢索日期:12月 14, 2025, https://www.calpaclab.com/chemical-charts/
Antioxidant Capacity with Physical Property Variations of Morinda citrifolia L. Juice in Traditional Fermentation - MDPI, 檢索日期:12月 14, 2025, https://www.mdpi.com/2673-4583/10/1/17
Migration of Chemical Compounds from Packaging Materials into Packaged Foods: Interaction, Mechanism, Assessment, and Regulations - MDPI, 檢索日期:12月 14, 2025, https://www.mdpi.com/2304-8158/13/19/3125
A Systematic Review: Migration of Chemical Compounds from Plastic Material Containers in Food and Pharmaceutical Fields - MDPI, 檢索日期:12月 14, 2025, https://www.mdpi.com/2039-4713/15/6/194
Effects of storage time and temperature on the antimony and some trace element release from polyethylene terephthalate (PET) into the bottled drinking water - PubMed Central, 檢索日期:12月 14, 2025, https://pmc.ncbi.nlm.nih.gov/articles/PMC4245802/
Effects of storage temperature and duration on release of antimony and bisphenol A from polyethylene terephthalate drinking water bottles of China | Request PDF - ResearchGate, 檢索日期:12月 14, 2025, https://www.researchgate.net/publication/262928646_Effects_of_storage_temperature_and_duration_on_release_of_antimony_and_bisphenol_A_from_polyethylene_terephthalate_drinking_water_bottles_of_China
Why Are Chemicals Stored In Plastic Containers?, 檢索日期:12月 14, 2025, https://www.reagent.co.uk/blog/plastic-containers-storing-chemicals/
Will white vinegar at some point melt HDPE plastic if contained for long enough? - Reddit, 檢索日期:12月 14, 2025, https://www.reddit.com/r/NoStupidQuestions/comments/y529l9/will_white_vinegar_at_some_point_melt_hdpe/
A Homebrewer's Guide to Plastics - Reddit, 檢索日期:12月 14, 2025, https://www.reddit.com/r/Homebrewing/comments/14u2ge/a_homebrewers_guide_to_plastics/
Is HDPE Food Safe? Your Guide to Food-Grade High-Density Polyethylene - Sales Plastics, 檢索日期:12月 14, 2025, https://salesplastics.com/hdpe-food-safe/
Risk Assessment of non-listed substances (NLS) and non-intentionally - Plastics Europe, 檢索日期:12月 14, 2025, https://plasticseurope.org/wp-content/uploads/2021/11/risk-assesment-of-non-listed-substances-and-non-assesed-substances.pdf
(PDF) CATALYST DESIGN IN POLYMERIZATION: ENHANCING EFFICIENCY IN PRODUCING FOOD-GRADE PLASTICS - ResearchGate, 檢索日期:12月 14, 2025, https://www.researchgate.net/publication/386874466_CATALYST_DESIGN_IN_POLYMERIZATION_ENHANCING_EFFICIENCY_IN_PRODUCING_FOOD-GRADE_PLASTICS
Polypropylene Chemical Resistance Guide - HMC Polymers Co., Ltd. (HMC), 檢索日期:12月 14, 2025, https://www.hmcpolymers.com/storage/download/hmc-pp-chemical-resistance.pdf
Is polypropylene safe? | polypropylene is a safer plastic - NonTox U, 檢索日期:12月 14, 2025, https://www.nontoxu.com/plastics-silicone/toxicity-of-polypropylene
Is Polypropylene Safe and BPA Free? - Healthline, 檢索日期:12月 14, 2025, https://www.healthline.com/health/is-polypropylene-safe
衛生組| 塑膠 - 新竹女中, 檢索日期:12月 14, 2025, https://www.hgsh.hc.edu.tw/ischool/publish_page/11/?cid=2767
Antimony in Polyethylene Terephthalate-Bottled Beverages: The Migration Puzzle - NIH, 檢索日期:12月 14, 2025, https://pmc.ncbi.nlm.nih.gov/articles/PMC10609323/
The Effect of Storage Time, Temperature and Type of Packaging on ..., 檢索日期:12月 14, 2025, https://pmc.ncbi.nlm.nih.gov/articles/PMC5848201/
Studies examine phthalate migration from PVC films and adhesives, 檢索日期:12月 14, 2025, https://foodpackagingforum.org/news/studies-examine-phthalate-migration-from-pvc-films-and-adhesives
Phthalates in Food Packaging and Food Contact Applications - FDA, 檢索日期:12月 14, 2025, https://www.fda.gov/food/food-additives-and-gras-ingredients-information-consumers/phthalates-food-packaging-and-food-contact-applications
食品容器具標示法規, 檢索日期:12月 14, 2025, https://www.fsi.net.tw/upload/13.%20%E6%94%BF%E7%AD%96%E8%AA%AA%E6%98%8E%E6%9C%83(%E7%AC%AC1,2%E5%A0%B4%E6%AC%A1)-%E9%A3%9F%E5%93%81%E5%AE%B9%E5%99%A8%E5%85%B7%E6%A8%99%E7%A4%BA%E6%B3%95%E8%A6%8F-1080409.pdf
Sanitation standard for food utensils, containers and packages, 檢索日期:12月 14, 2025, https://www.mohw.gov.tw/dl-81752-29662d68-c7b9-464e-8c4a-3b2d3cef263f.html
公告食品器具、食品容器或包裝標示相關規定, 檢索日期:12月 14, 2025, https://ssinsp.com.tw/%E9%87%8D%E5%A4%A7%E8%A8%8A%E6%81%AF/106.04%E5%85%AC%E5%91%8A%E3%80%8C%E9%A3%9F%E5%93%81%E5%99%A8%E5%85%B7%E3%80%81%E9%A3%9F%E5%93%81%E5%AE%B9%E5%99%A8%E6%88%96%E5%8C%85%E8%A3%9D%E6%A8%99%E7%A4%BA%E7%9B%B8%E9%97%9C%E8%A6%8F%E5%AE%9A%E3%80%8D.pdf
Regulations on the Labeling of Food Utensils, Food Containers, or Packaging - Food and Drug Administration, Department of Health, 檢索日期:12月 14, 2025, https://www.fda.gov.tw/eng/lawContent.aspx?cid=16&id=3090
Taiwan Issues Clarification, and Proposes Changes, Regarding Labelling of Food Contact Articles - Intertek, 檢索日期:12月 14, 2025, https://www.intertek.com/products-retail/insight-bulletins/2015/taiwan-issues-clarification-and-proposes-changes-regarding-labelling-of-food-contact-articles/
REGIONAL STANDARD FOR FERMENTED NONI FRUIT JUICE ..., 檢索日期:12月 14, 2025, https://www.fao.org/fao-who-codexalimentarius/sh-proxy/pl/?lnk=1&url=https%253A%252F%252Fworkspace.fao.org%252Fsites%252Fcodex%252FStandards%252FCXS%2B356R-2023%252FCXS%2B356Re.pdf
Bisphenol A (BPA): Use in Food Contact Application - FDA, 檢索日期:12月 14, 2025, https://www.fda.gov/food/food-packaging-other-substances-come-contact-food-information-consumers/bisphenol-bpa-use-food-contact-application