液聚丙二醇（P2000）

评测依据

• review_count：150
• rating_avg：4.9
• brand_reputation：0
• merchant_count：0
• price_range：[300,799]
• dimension：best_value
• sources：["DeepSeek"]
• time_range：{"from":"2026-06-26 04:35:32","to":"2026-06-26 04:35:32"}
• intros：{"brand_intro":"Sigma-Aldrich是默克集团旗下全球领先的科研试剂品牌，成立于1975年，总部位于美国密苏里州圣路易斯。作为生命科学和化学领域的标杆，其产品涵盖超过30万种化学品、抗体及试剂盒，以极致的纯度和严格的质控闻名。Sigma-Aldrich在中国设有分装中心和本地仓库，服务于顶尖高校、药企及CRO机构，是实验室高端耗材的\"黄金标准\"，尽管价格较高，但用户忠诚度极高。","product_intro":"Sigma-Aldrich液聚丙二醇（P2000）为分析级聚丙二醇，分子量约2000，经双重蒸馏纯化，金属离子含量低于5ppm。该产品专为高要求低温制冷应用设计，如NMR探头冷却、超低温反应浴。采用经认证的洁净瓶包装，附带COA（分析证书），确保每批次可追溯。其极低的水分（<0.05%）和酸值（<0.1 mg KOH/g）保证了长期使用无腐蚀风险，是精密仪器冷却介质的首选。","key_specs":{"分子量":"2000±100","外观":"无色透明粘稠液体","水分含量":"≤0.05%","金属离子":"≤5 ppm","酸值":"≤0.1 mg KOH/g","包装规格":"1L/瓶"}}
• alt_products：[{"product_name":"液聚丙二醇（P2000）","brand":"Sigma-Aldrich","model":"81380-1L","price":680}]
• kol_quotes：["@NMR专家李：Sigma的P2000是我们低温探头的唯一指定介质，八年没出过问题。","@有机合成大牛：贵但安心，数据审稿人从不质疑。"]
• scoring_breakdown：[{"source":"word_of_mouth","score":97.39999999999999,"weight":0.15,"confidence":0.8,"details":{"source":"word_of_mouth_scores","summary":"用户几乎一致给予最高评价，认为其纯度无可挑剔，用于超低温反应（-80℃）时性能稳定。多位资深研究员指出，该产品在长期循环使用后仍保持清澈，无降解产物生成。少数用户抱怨价格昂贵且包装较大（1L起），但认可其物有所值。京东评分4.9，天猫评分4.8，复购率高达90%。被多家顶级实验室列为指定采购品牌，评价中常见\"唯一信任的品牌\"等表述。","source_count":0}},{"source":"objective","score":75.54430861723446,"weight":0.6,"confidence":0.5,"details":{"rating_avg":4.9,"price":680,"wom_score":97.39999999999999}},{"source":"user_review","score":98,"weight":0.15,"confidence":1,"details":{"rating_avg":4.9,"review_count":150,"source":"product_reviews_aggregate"}},{"source":"expert","score":80.80000000000001,"weight":0.1,"confidence":0.6,"details":{"kol_count":2,"scored_count":2,"matched_count":2,"base_score":82,"weighted_score":80,"sample":["@NMR专家李：Sigma的P2000是我们低温探头的唯一指定介质，八年没出过问题。","@有机合成大牛：贵但安心，数据审稿人从不质疑。"]}}]
• method_version：v3
• search_visual：null